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700 | comp.graphics | ms windows graphics viewer howdy all i was wondering if people could e mail me their opinions on the various graphics viewers available for ms windows x i m working on a project to set up our scanner and write documentation on how to use it and it would be nice to have a snazzy image viewer to look at and maybe even edit the image you just scanned the file formats i m looking for gif jpeg tiff pcx whatever other major file formats there are thanks a lot for your help grant grant totten programmer analyst trent university peterborough ontario gtotten trentu ca phone fax in the days of old when knights were bold and women were too cautious oh those gallant days when women were women and men were really obnoxious
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701 | comp.graphics | re rumours about do in article apr rchland ibm com ricardo rchland vnet ibm com ricardo hernandez muchado writes in article apr mercury unt edu sean mcmains mcmains unt edu writes in article apr rchland ibm com ricardo hernandez muchado ricardo rchland vnet ibm com writes and cd i s cpu doesn t help much either i understand it is a supposedly a variation of a running at something like mhz with this speed you truly need sprites snip the do is not a ricardo the animation playback to which lawrence was referring in an earlier post is plain old quicktime with the compact video codec i ve seen digitized video some of apple s early commercials to be precise running on a centris at about fps very nicely bit color depth i would expect that using the same algorithm a risc processor should be able to approach full screen full motion animation though as you ve implied the processor will be taxed more with highly dynamic material snip booth there i walked by and they were showing real time video capture using a radious or supermac card to digitize and make right on the spot quicktime movies i think the quicktime they were using was the old one they digitized a guy talking there in x xx something it played back quite nicely and in real time the guy then expanded the window resized to x by xx in y i think and the frame rate decreased enough to notice that it wasn t fps or about fps anymore it dropped to like fps then he increased it just a bit more and it dropped to fps then i asked him what mac he was using he was using a quadra don t know what model to do it and he was telling the guys there that the quicktime could play back at the same speed even on an lcii well i spoiled his claim so to say since a quadra mac was having a little bit of trouble and this wasn t even from the hardisk this was from memory could it be that you saw either a newer version of quicktime or some hardware assisted centris or another software product running the animation like supposedly macromind s accelerator don t misunderstand me i just want to clarify this the do box is based on an arm risc processor one or two custom graphics chips a dsp a double speed cdrom and mb of ram vram i m a little fuzzy on the breakdown of the graphics chips and ram vram capacity it was demonstrated at a recent gathering at the electronic cafe in santa monica ca from do rj mical of amiga lynx fame and hal josephson sp were there to talk about the machine and their plan we got to see the unit displaying full screen movies using the compactvideo codec which was nice very little blockiness showing clips from jaws and backdraft and a very high frame rate to boot like fps note however that the do s screen resolution is x compactvideo is pretty amazing i also wanted to point out that quicktime does indeed slow down when one dynamically resizes material as was stated above i m sure if the material had been compressed at the large size then it would play back fine i have a q and do this quite a bit the price of generality personally i don t use the dynamic sizing of movies often if ever but playing back stuff at its original size is plenty quick on the latest machines i m not sure how a centris mhz stacks up against the mhz arm in the do box obviously the arm is faster but how much rob barris quicksilver software inc rbarris orion oac uci edu
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702 | comp.graphics | re fast polygon routine needed in article apr sophia smith edu orourke sophia smith edu joseph o rourke writes in article c n x b l news cso uiuc edu osprey ux cso uiuc edu lucas adamski writes this may be a fairly routine request on here but i m looking for a fast polygon routine to be used in a d game a fast polygon routine to do what to draw polygons of course its a vga mode h x game done in c and asm i need a faster way to draw concave polygons that the method i have right now which is very slow lucas
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703 | comp.graphics | re cview answers in article c mv n t rahul net bryanw rahul net bryan woodworth writes in apr imag fr schaefer imag imag fr arno schaefer writes sorry bryan this is not quite correct remember the vgalib package that comes with linux sls it will switch to vga x x mode without xwindows so at least it is possible to write a gif viewer under linux however i don t think that there exists a similar svga package and viewing gifs in x is not very nice no vgalib amazing i guess it was lost in all those subdirs thanks for correcting me it doesn t sound very appealing though only x i m glad it wasn t something major i missed tommy frandsen s vgalib which is probably what you re talking about will do the standard vga modes some tweaked modes and then the tseng et super vga modes i have an et and i m viewing gif s at x i have a lousy small monitor with dpg view on linux i think i had to change some constants in the dpg view sources to make it use the et k modes vgalib s sources seem to be designed for easy addition of new super vga support each mode is an array of register values and there s a program that dumps an array declaration of this kind describing the current mode haven t tried it though btw my version of vgalib is kennu mits mdata fi try linux a free unix by linus torvalds for s read comp os linux or ask me by email if you like for more information you can run x tex gnu emacs and much more on top of a nice posix environment
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704 | comp.graphics | anyone know use rayshade out there i m using rayshade on the u w computers here and i d like input from other users and perhaps swap some ideas i could post uuencoded gifs here or ray code if anyone s interested i m having trouble coming up with colors that are metallic i e brass steel from the rgb values if you re on the u w machines check out fineman rle files rle on stein u washington edu for some of what i ve got dan
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705 | comp.graphics | re fake virtual reality the most ridiculous example of vr exploitation i ve seen so far is the virtual reality clothing company which recently opened up in vancouver as far as i can tell it s just another chic clothes spot although it would be interesting if they were selling virtual clothing e mail me if you want me to dig up their phone and you can probably get some promotional lit mp
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706 | comp.graphics | video in out i m getting ready to buy a multimedia workstation and would like a little advice i need a graphics card that will do video in and out under windows i was originally thinking of a targa but that doesn t work under windows what cards should i be looking into thanks craig to forgive is divine to be craig williamson an airhead is human craig williamson columbiasc ncr com balki bartokomas craig toontown columbiasc ncr com home perfect strangers
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707 | comp.graphics | ms windows screen grabber howdy all where could i find a screen grabber program for ms windows i m writing up some documentation and it would be very helpful to include sample screens into the document please e mail as i don t usualy follow this group thanks a lot grant grant totten programmer analyst trent university peterborough ontario gtotten trentu ca phone fax the human brain is like an enormous fish it is flat and slimy and has gills through which it can see monty python
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708 | comp.graphics | re rumours about do in article bd news service uci edu rbarris orion oac uci edu robert c barris writes we got to see the unit displaying full screen movies using the compactvideo codec which was nice very little blockiness showing clips from jaws and backdraft and a very high frame rate to boot like fps acorn replay running on a mhz arm processor the arm is about slower than the arm does this in software off a standard cd rom bit colour at about the same resolution so what if the computer only has bit colour support real time dithering too the d o is supposed to have a couple of dsps the arm being used for housekeeping i m not sure how a centris mhz stacks up against the mhz arm in the do box obviously the arm is faster but how much a mhz arm xx should clock around arm mips say flat out depends really on the surrounding system and whether you are talking arm x or arm xx the latter has a cache and so is essential to run at this kind of speed with slower memory i ll stop saying things there cos i ll hopefully be working for arm after graduation mike ps don t pay heed to what reps from philips say if the d o doesn t beat the pants off di then i ll eat this postscript michael williams part ii computer science tripos mjw phx cam ac uk university of cambridge cymdeithas genedlaethol traddodiad troi teigrod mwythus ben i waered
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709 | comp.graphics | dicta australian pattern recognition society nd call for papers dicta nd conference on digital imaging computing techniques and applications location macquarie theatre macquarie university sydney date december dicta is the second biennial national conference of the australian pattern recognition society this event will provide an opportunity for any persons with an interest in computer vision digital image processing analysis and other aspects of pattern recognition to become informed about contemporary developments in the area to exchange ideas to establish contacts and to share details of their own work with others the following invited speakers will provide specialised presentations prof gabor t herman university of pennsylvania on medical imaging prof r m hodgson massey university new zealand on computer vision prof dominique juelin centre de morphologie mathematique paris on mathematical morphology prof john richards aust defence force academy canberra on remote sensing dr phillip k robertson csiro division of information technology canberra on interactive visualisation the conference will concentrate on but is not limited to the following areas of image processing computer vision and object recognition motion analysis morphology medical imaging fuzzy logic and neural networks image coding machine vision and robotics enhancement and restoration enhancement and restoration visualisation industrial applications software and hardware tools papers are sought for presentation at the conference and publication in the conference proceedings submission for peer review should consist of an extended abstract of words of doubled spaced text summarizing the technical aspects of the paper and any results that will be quoted final papers should be limited to no more than pages of text and illustrations in camera ready form four copies of the abstract should be sent to dicta c tony adriaansen csiro division of wool technology po box ryde nsw australia important dates abstract due th june acceptance notified th august final paper due th october social program the conference dinner will be held on the thursday th of december other social activities are being arranged situated on a beautiful harbour sydney has many and varied places of interest the opera house and harbour bridge are just two of the well known landmarks harbour cruises city tours to the blue mountains run daily we can provide further information on request accommodation accommodation within min walking distance is available ranging from college style to star hotel facilities information will be supplied upon request conference fees before th sep after th sep aprs members a a aprs student members a a others a a conference dinner a on dec th advanced registration name organisation address phone fax email i am a current member of aprs i am not a current member of aprs please send me information on accommodation i enclose a cheque for please send the above form to dicta c tony adriaansen csiro division of wool technology po box ryde nsw australia the cheques should be made payable to dicta for further information contact tony adriaansen athula ginigie email dicta ee uts edu au aprs is a member of iapp the international association for pattern recognition inc an affiliated member of the international federation for information processing
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710 | comp.graphics | re so what is the fastest windows video c in article apr trentu ca ayounes trentu ca amro younes trent university c c peterborough on canada k j b writes i have the ati graphics ultra pro eisa version i must admit it has received bad press but that was due to the faulty drivers it had pc magazine seems to be impressed with the ati card in their most recent reviews in the april th issue they rate the ati graphics ultra pro eisa version as their editor s choice they noted that the drivers had improved since they tested the isa version in january cuyler
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711 | comp.graphics | re weitek p jgreen amber joe green writes anyone know about the weitek p graphics chip do you have weitek s address phone number i d like to get some information about this chip yes i am very interested in this chip please follow up or email bill egan cavalier graphics houston texas email cavalier blkbox com
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712 | comp.graphics | jpeg image compression frequently asked questions archive name jpeg faq last modified april this faq article discusses jpeg image compression suggestions for additions and clarifications are welcome new since version of april new versions of image archiver and pmjpeg for os this article includes the following sections what is jpeg why use jpeg when should i use jpeg and when should i stick with gif how well does jpeg compress images what are good quality settings for jpeg where can i get jpeg software a canned software viewers etc b source code what s all this hoopla about color quantization how does jpeg work what about lossless jpeg why all the argument about file formats how do i recognize which file format i have and what do i do about it what about arithmetic coding does loss accumulate with repeated compression decompression what are some rules of thumb for converting gif images to jpeg sections are basic info that every jpeg user needs to know sections are advanced info for the curious this article is posted every weeks you can always find the latest version in the news answers archive at rtfm mit edu by ftp fetch pub usenet news answers jpeg faq or if you don t have ftp send e mail to mail server rtfm mit edu with body send usenet news answers jpeg faq many other faq articles are also stored in this archive for more instructions on use of the archive send e mail to the same address with the words help and index no quotes on separate lines if you don t get a reply the server may be misreading your return address add a line such as path myname mysite to specify your correct e mail address to reply to what is jpeg jpeg pronounced jay peg is a standardized image compression mechanism jpeg stands for joint photographic experts group the original name of the committee that wrote the standard jpeg is designed for compressing either full color or gray scale digital images of natural real world scenes it does not work so well on non realistic images such as cartoons or line drawings jpeg does not handle black and white bit per pixel images nor does it handle motion picture compression standards for compressing those types of images are being worked on by other committees named jbig and mpeg respectively jpeg is lossy meaning that the image you get out of decompression isn t quite identical to what you originally put in the algorithm achieves much of its compression by exploiting known limitations of the human eye notably the fact that small color details aren t perceived as well as small details of light and dark thus jpeg is intended for compressing images that will be looked at by humans if you plan to machine analyze your images the small errors introduced by jpeg may be a problem for you even if they are invisible to the eye a useful property of jpeg is that the degree of lossiness can be varied by adjusting compression parameters this means that the image maker can trade off file size against output image quality you can make extremely small files if you don t mind poor quality this is useful for indexing image archives making thumbnail views or icons etc etc conversely if you aren t happy with the output quality at the default compression setting you can jack up the quality until you are satisfied and accept lesser compression why use jpeg there are two good reasons to make your image files smaller and to store bit per pixel color data instead of bit per pixel data making image files smaller is a big win for transmitting files across networks and for archiving libraries of images being able to compress a mbyte full color file down to kbytes or so makes a big difference in disk space and transmission time if you are comparing gif and jpeg the size ratio is more like four to one more details below if your viewing software doesn t support jpeg directly you ll have to convert jpeg to some other format for viewing or manipulating images even with a jpeg capable viewer it takes longer to decode and view a jpeg image than to view an image of a simpler format gif for instance thus using jpeg is essentially a time space tradeoff you give up some time in order to store or transmit an image more cheaply it s worth noting that when network or phone transmission is involved the time savings from transferring a shorter file can be much greater than the extra time to decompress the file i ll let you do the arithmetic yourself the other reason why jpeg will gradually replace gif as a standard usenet posting format is that jpeg can store full color information bits pixel million colors instead of or less or fewer colors if you have only bit display hardware then this may not seem like much of an advantage to you within a couple of years though bit gif will look as obsolete as black and white macpaint format does today furthermore for reasons detailed in section jpeg is far more useful than gif for exchanging images among people with widely varying color display hardware hence jpeg is considerably more appropriate than gif for use as a usenet posting standard when should i use jpeg and when should i stick with gif jpeg is not going to displace gif entirely for some types of images gif is superior in image quality file size or both one of the first things to learn about jpeg is which kinds of images to apply it to as a rule of thumb jpeg is superior to gif for storing full color or gray scale images of realistic scenes that means scanned photographs and similar material jpeg is superior even if you don t have bit display hardware and it is a lot superior if you do see section for details gif does significantly better on images with only a few distinct colors such as cartoons and line drawings in particular large areas of pixels that are all exactly the same color are compressed very efficiently indeed by gif jpeg can t squeeze these files as much as gif does without introducing visible defects this sort of image is best kept in gif form in particular single color borders are quite cheap in gif files but they should be avoided in jpeg files jpeg also has a hard time with very sharp edges a row of pure black pixels adjacent to a row of pure white pixels for example sharp edges tend to come out blurred unless you use a very high quality setting again this sort of thing is not found in scanned photographs but it shows up fairly often in gif files borders overlaid text etc the blurriness is particularly objectionable with text that s only a few pixels high if you have a gif with a lot of small size overlaid text don t jpeg it computer drawn images ray traced scenes for instance usually fall between scanned images and cartoons in terms of complexity the more complex and subtly rendered the image the more likely that jpeg will do well on it the same goes for semi realistic artwork fantasy drawings and such plain black and white two level images should never be converted to jpeg you need at least about gray levels before jpeg is useful for gray scale images it should also be noted that gif is lossless for gray scale images of up to levels while jpeg is not if you have an existing library of gif images you may wonder whether you should convert them to jpeg you will lose a little image quality if you do section which argues that jpeg image quality is superior to gif only applies if both formats start from a full color original if you start from a gif you ve already irretrievably lost a great deal of information jpeg can only make things worse however the disk space savings may justify converting anyway this is a decision you ll have to make for yourself if you do convert a gif library to jpeg see section for hints be prepared to leave some images in gif format since some gifs will not convert well how well does jpeg compress images pretty darn well here are some sample file sizes for an image i have handy a x full color image of a ship in a harbor the first three files are for comparison purposes the rest were created with the free jpeg software described in section b file size in bytes comments ship ppm original file in ppm format no compression bits or bytes per pixel plus a few bytes overhead ship ppm z ppm file passed through unix compress compress doesn t accomplish a lot you ll note other text oriented compressors give similar results ship gif converted to gif with ppmquant fs ppmtogif most of the savings is the result of losing color info gif saves bits pixel not see sec ship jpg cjpeg q highest useful quality setting this is indistinguishable from the bit original at least to my nonprofessional eyeballs ship jpg cjpeg q default setting you have to look mighty darn close to distinguish this from the original even with both on screen at once ship jpg cjpeg q this has slight defects if you know what to look for you could tell it s been jpeged without seeing the original still as good image quality as many recent postings in usenet pictures groups ship jpg cjpeg q jpeg s characteristic blockiness becomes apparent at this setting djpeg blocksmooth helps some still i ve seen plenty of usenet postings that were of poorer image quality than this ship jpg o cjpeg q optimize optimize cuts table overhead blocky but perfectly satisfactory for preview or indexing purposes note that this file is tiny the compression ratio from the original is in this case jpeg can make a file that s a factor of four or five smaller than a gif of comparable quality the q file is every bit as good as the gif better if you have a full color display this seems to be a typical ratio for real world scenes what are good quality settings for jpeg most jpeg compressors let you pick a file size vs image quality tradeoff by selecting a quality setting there seems to be widespread confusion about the meaning of these settings quality does not mean keep of the information as some have claimed the quality scale is purely arbitrary it s not a percentage of anything the name of the game in using jpeg is to pick the lowest quality setting smallest file size that decompresses into an image indistinguishable from the original this setting will vary from one image to another and from one observer to another but here are some rules of thumb the default quality setting q is very often the best choice this setting is about the lowest you can go without expecting to see defects in a typical image try q first if you see defects then go up except for experimental purposes never go above q saying q will produce a file two or three times as large as q but of hardly any better quality if the image was less than perfect quality to begin with you might be able to go down to q without objectionable degradation on the other hand you might need to go to a higher quality setting to avoid further degradation the second case seems to apply much of the time when converting gifs to jpeg the default q is about right for compressing bit images but q to is usually better for converting gifs see section for more info if you want a very small file say for preview or indexing purposes and are prepared to tolerate large defects a q setting in the range of to is about right q or so may be amusing as op art note the quality settings discussed in this article apply to the free jpeg software described in section b and to many programs based on it other jpeg implementations such as image alchemy may use a completely different quality scale some programs don t even provide a numeric scale just high medium low style choices where can i get jpeg software most of the programs described in this section are available by ftp if you don t know how to use ftp see the faq article how to find sources if you don t have direct access to ftp read about ftpmail servers in the same article that article appears regularly in news answers or you can get it by sending e mail to mail server rtfm mit edu with send usenet news answers finding sources in the body the anonymous ftp list faq may also be helpful it s usenet news answers ftp list faq in the news answers archive note this list changes constantly if you have a copy more than a couple months old get the latest jpeg faq from the news answers archive a if you are looking for canned software viewers etc the first part of this list is system specific programs that only run on one kind of system if you don t see what you want for your machine check out the portable jpeg software described at the end of the list note that this list concentrates on free and shareware programs that you can obtain over internet but some commercial programs are listed too x windows john bradley s free xv version and up is an excellent viewer for jpeg gif and other image formats it s available for ftp from export lcs mit edu or ftp cis upenn edu the file is called xv tar z where is the version number currently it is located in the contrib directory on export or the pub xv directory at upenn xv reduces all images to bits internally which means it s not a real good choice if you have a bit display you ll still get only bit color also you shouldn t use xv to convert full color images to jpeg because they ll get color quantized first but xv is a fine tool for converting gif and other bit images to jpeg caution there is a glitch in versions and earlier be sure to check the save at normal size checkbox when saving a jpeg file or the file will be blurry another good choice for x windows is john cristy s free imagemagick package also available from export lcs mit edu file contrib imagemagick tar z this package handles many image processing and conversion tasks the imagemagick viewer handles bit displays correctly for colormapped displays it does better though slower color quantization than xv or the basic free jpeg software both of the above are large complex packages if you just want a simple image viewer try xloadimage or xli xloadimage supports jpeg in its latest release xloadimage is free and available from export lcs mit edu file contrib xloadimage tar z xli is a variant version of xloadimage said by its fans to be somewhat faster and more robust than the original the current xli is indeed faster and more robust than the current xloadimage at least with respect to jpeg files because it has the ijg v decoder while xloadimage is using a hacked over v the next xloadimage release will fix this xli is also free and available from export lcs mit edu file contrib xli tar z both programs are said to do the right thing with bit displays ms dos this covers plain dos for windows or os programs see the next headings one good choice is eric praetzel s free dvpeg which views jpeg and gif files the current version a is available by ftp from sunee uwaterloo ca file pub jpeg viewers dvpeg a zip this is a good basic viewer that works on either or machines the user interface is not flashy but it s functional another freeware jpeg gif tga viewer is mohammad rezaei s hiview the current version is available from simtel and mirror sites see note below file msdos graphics hv zip hiview requires a or better cpu and a vcpi compatible memory manager qemm and max work windows and os do not hiview is currently the fastest viewer for images that are no bigger than your screen for larger images it scales the image down to fit on the screen rather than using panning scrolling as most viewers do you may or may not prefer this approach but there s no denying that it slows down loading of large images considerably note installation is a bit tricky read the directions carefully a shareware alternative is colorview for dos this is easier to install than either of the two freeware alternatives its user interface is also much spiffier looking although personally i find it harder to use more keystrokes inconsistent behavior it is faster than dvpeg but a little slower than hiview at least on my hardware for images larger than screen size dvpeg and colorview seem to be about the same speed and both are faster than hiview the current version is available from simtel and mirror sites see note below file msdos graphics dcview zip requires a vesa graphics driver if you don t have one look in vesadrv zip or vesa tsr zip from the same directory many recent pcs have a built in vesa driver so don t try to load a vesa driver unless colorview complains that the driver is missing a second shareware alternative is fullview which has been kicking around the net for a while but i don t know any stable archive location for it the current rather old version is inferior to the above viewers anyway the author tells me that a new version of fullview will be out shortly and it will be submitted to the simtel archives at that time the well known gif viewer compushow cshow supports jpeg in its latest revision a however cshow s jpeg implementation isn t very good it s slow about half the speed of the above viewers and image quality is poor except on hi color displays too bad it d have been nice to see a good jpeg capability in cshow shareware available from simtel and mirror sites see note below file msdos gif cshw a zip due to the remarkable variety of pc graphics hardware any one of these viewers might not work on your particular machine if you can t get any of them to work you ll need to use one of the following conversion programs to convert jpeg to gif then view with your favorite gif viewer if you have hi color hardware don t use gif as the intermediate format try to find a targa capable viewer instead vpic is reputed to do the right thing with hi color displays the independent jpeg group s free jpeg converters are ftpable from simtel and mirror sites see note below file msdos graphics jpeg zip or jpeg zip if you have a and extended memory these files are dos compilations of the free source code described in section b they will convert jpeg to and from gif targa and ppm formats handmade software offers free jpeg gif conversion tools gif jpg jpg gif these are slow and are limited to conversion to and from gif format in particular you can t get bit color output from a jpeg the major advantage of these tools is that they will read and write hsi s proprietary jpeg format as well as the usenet standard jfif format since hsi format files are rather widespread on bbses this is a useful capability version of these tools is free prior versions were shareware get it from simtel and mirror sites see note below file msdos graphics gif jpg zip note do not use hsi format for files to be posted on internet since it is not readable on non pc platforms handmade software also has a shareware image conversion and manipulation package image alchemy this will translate jpeg files both jfif and hsi formats to and from many other image formats it can also display images a demo version of image alchemy version is available from simtel and mirror sites see note below file msdos graphics alch zip note about simtel the internet s key archive site for pc related programs is simtel full name wsmr simtel army mil simtel runs a non unix system with weird directory names where this document refers to directory eg msdos graphics at simtel that really means pd msdos graphics if you are not physically on milnet you should expect rather slow ftp transfer rates from simtel there are several internet sites that maintain copies mirrors of the simtel archives most ftp users should go to one of the mirror sites instead a popular usa mirror site is oak oakland edu which keeps simtel files in eg pub msdos graphics if you have no ftp capability you can retrieve files from simtel by e mail see informational postings in comp archives msdos announce to find out how if you are outside the usa consult the same newsgroup to learn where your nearest simtel mirror is microsoft windows there are several windows programs capable of displaying jpeg images windows viewers are generally slower than dos viewers on the same hardware due to windows system overhead note that you can run the dos conversion programs described above inside a windows dos window the newest entry is winecj which is free and extremely fast version is available from ftp rahul net file pub bryanw pc jpeg wecj zip requires windows and or more colors mode this is a no frills viewer with the bad habit of hogging the machine completely while it decodes and the image quality is noticeably worse than other viewers but it s so fast you ll use it anyway at least for previewing jview is freeware fairly fast has good on line help and can write out the decompressed image in windows bmp format but it can t create new jpeg files and it doesn t view gifs jview also lacks some other useful features of the shareware viewers such as brightness adjustment but it s an excellent basic viewer the current version is available from ftp cica indiana edu file pub pc win desktop jview zip mirrors of this archive can be found at some other internet sites including wuarchive wustl edu winjpeg shareware displays jpeg gif targa tiff and bmp image files it can write all of these formats too so it can be used as a converter it has some other nifty features including color balance adjustment and slideshow the current version is available from simtel and mirror sites see note above file msdos windows winjp zip this is a slow compatible version if you register you ll get the only version which is roughly faster colorview is another shareware entry this was an early and promising contender but it has not been updated in some time and at this point it has no real advantages over winjpeg if you want to try it anyway the current version is available from ftp cica indiana edu file pub pc win desktop cview zip i understand that a new version will be appearing once the authors are finished with colorview for dos dvpeg see dos heading also works under windows but only in full screen mode not in a window os the following files are available from hobbes nmsu edu note check pub uploads for more recent versions the hobbes moderator is not very fast about moving uploads into their permanent directories pub os x graphics jpegv zip bit version of free ijg conversion programs version pub os all graphics jpeg zip bit version of same for os x pub os x graphics imgarc zip image archiver image conversion viewing with pm graphical interface strong on conversion functions viewing is a bit weaker shareware pub os x graphics pmjpeg zip pmjpeg os x port of winjpeg a popular viewer for windows see description in windows section shareware pub os x graphics pmview zip pmview jpeg gif bmp viewer gif viewing very fast jpeg viewing fast if you have huge amounts of ram otherwise about the same speed as the above programs strong bit display support shareware macintosh most mac jpeg programs rely on apple s jpeg implementation which is part of the quicktime system extension so you need to have quicktime installed to use quicktime you need a or better cpu and you need to be running system or later if you re running system you must also install the bit quickdraw extension this is built in on system you can get quicktime by ftp from ftp apple com file dts mac quicktime quicktime hqx as of this file contains quicktime which is better than qt in several ways with respect to jpeg it is marginally faster and considerably less prone to crash when fed a corrupt jpeg file however some applications seem to have compatibility problems with qt mac users should keep in mind that quicktime s jpeg format pict jpeg is not the same as the usenet standard jfif jpeg format see section for details if you post images on usenet make sure they are in jfif format most of the programs mentioned below can generate either format the first choice is probably jpegview a free program for viewing images that are in jfif format pict jpeg format or gif format it also can convert between the two jpeg formats the current version is a big improvement over prior versions get it from sumex aim stanford edu file info mac app jpeg view hqx requires system and quicktime on bit displays jpegview usually produces the best color image quality of all the currently available mac jpeg viewers jpegview can view large images in much less memory than other mac viewers in fact it s the only one that can deal with jpeg images much over x pixels on a typical mb mac given a large image jpegview automatically scales it down to fit on the screen rather than presenting scroll bars like most other viewers you can zoom in on any desired portion though some people like this behavior some don t overall jpegview s user interface is very well thought out gifconverter a shareware image viewer converter supports jfif and pict jpeg as well as gif and several other image formats the latest version is get it from sumex aim stanford edu file info mac art gif gif converter hqx requires system or later gifconverter is not better than jpegview as a plain jpeg gif viewer but it has much more extensive image manipulation and format conversion capabilities so you may find it worth its shareware fee if you do a lot of playing around with images also the newest version of gifconverter can load and save jfif images without quicktime so it is your best bet if your machine is too old to run quicktime but it s faster with quicktime note if gifconverter runs out of memory trying to load a large jpeg try converting the file to gif with jpeg convert then viewing the gif version jpeg convert a mac version of the free ijg jpeg conversion utilities is available from sumex aim stanford edu file info mac app jpeg convert hqx this will run on any mac but it only does file conversion not viewing you can use it in conjunction with any gif viewer previous versions of this faq recommended imagery jpeg v a jpeg gif converter based on an old version of the ijg code if you are using this program you definitely should replace it with jpeg convert apple s free program pictpixie can view images in jfif quicktime jpeg and gif format and can convert between these formats you can get pictpixie from ftp apple com file dts mac quicktime qt stuff pictpixie hqx requires quicktime pictpixie was intended as a developer s tool and it s really not the best choice unless you like to fool around with quicktime some of its drawbacks are that it requires lots of memory it produces relatively poor color image quality on anything less than a bit display and it has a relatively unfriendly user interface worse pictpixie is an unsupported program meaning it has some minor bugs that apple does not intend to fix there is an old version of pictpixie called pictcompressor floating around the net if you have this you should trash it as it s even buggier also the quicktime starter kit includes a much cleaned up descendant of pictpixie called picture compressor note that picture compressor is not free and may not be distributed on the net storm technology s picture decompress is a free jpeg viewer converter this rather old program is inferior to the above programs in many ways but it will run without system or quicktime so you may be forced to use it on older systems it does need bit quickdraw so really old machines can t use it you can get it from sumex aim stanford edu file info mac app picture decompress hqx you must set the file type of a downloaded image file to jpeg to allow picture decompress to open it if your machine is too old to run bit quickdraw a mac plus for instance gifconverter is your only choice for single program jpeg viewing if you don t want to pay for gifconverter use jpeg convert and a free gif viewer more and more commercial mac applications are supporting jpeg although not all can deal with the usenet standard jfif format adobe photoshop version or later can read and write jfif format jpeg files use the jpeg plug in from the acquire menu you must set the file type of a downloaded jpeg file to jpeg to allow photoshop to recognize it amiga most programs listed in this section are stored in the aminet archive at amiga physik unizh ch there are many mirror sites of this archive and you should try to use the closest one in the usa a good choice is wuarchive wustl edu look under mirrors amiga physik unizh ch hamlab plus is an excellent jpeg viewer converter as well as being a general image manipulation tool it s cheap shareware and can read several formats besides jpeg the current version is a demo version is available from amiga physik unizh ch and mirror sites file amiga gfx edit hamlab d lha the demo version will crop images larger than x but it is otherwise fully functional rend shareware is an image renderer that can display jpeg ilbm and gif images the program can be used to create animations even capturing frames on the fly from rendering packages like lightwave the current version is available from amiga physik unizh ch and mirror sites file amiga os gfx rend lha note although this directory is supposedly for amigados programs the program will also run under amigados or viewtek is a free jpeg ilbm gif anim viewer the current version is available from amiga physik unizh ch and mirror sites file amiga gfx show viewtek lha if you re willing to spend real money there are several commercial packages that support jpeg two are written by thomas krehbiel the author of rend and viewtek these are cinemorph a standalone image morphing package and imagefx an impressive bit image capture conversion editing painting effects and prepress package that also includes cinemorph both are distributed by great valley products art department professional adpro from asdg inc is the most widely used commercial image manipulation software for amigas imagemaster from black belt systems is another well regarded commercial graphics package with jpeg support the free ijg jpeg software is available compiled for amigas from amiga physik unizh ch and mirror sites in directory amiga gfx conv file amigajpegv lha these programs convert jpeg to from ppm gif targa formats the amiga world is heavily infested with quick and dirty jpeg programs many based on an ancient beta test version of the free ijg jpeg software thanks to a certain magazine that published same on its disk of the month without so much as notifying the authors among these are augjpeg newamyjpeg vjpeg and probably others i have not even heard of in my opinion anything older than ijg version march is not worth the disk space it s stored on if you have such a program trash it and get something newer atari st the free ijg jpeg software is available compiled for atari st tt etc from atari archive umich edu file atari graphics jpeg bin zoo these programs convert jpeg to from ppm gif targa formats i have not heard of any free or shareware jpeg capable viewer for ataris but surely there must be one by now pointers appreciated acorn archimedes changefsi supplied with risc os version can convert from and view jpeg jfif format provision is also made to convert images to jpeg although this must be done from the cli rather than by double clicking recent versions since of the shareware program translator can handle jpeg along with about other image formats while older versions can be found on some archimedes bboards the current version is only available by registering with the author john kortink nutterbrink wj enschede the netherlands price dutch guilders about or pounds there s also a commercial product called jpeg which provides jpeg read write functionality and direct jpeg viewing as well as a host of other image format conversion and processing options this is more expensive but not necessarily better than the above programs contact dt software freepost cambridge uk tel portable software for almost any system if none of the above fits your situation you can obtain and compile the free jpeg conversion software described in b you ll also need a viewer program if your display is bits or less any gif viewer will do fine if you have a display with more color capability try to find a viewer that can read targa or ppm bit image files there are numerous commercial jpeg offerings with more popping up every day i recommend that you not spend money on one of these unless you find the available free or shareware software vastly too slow in that case purchase a hardware assisted product ask pointed questions about whether the product complies with the final jpeg standard and about whether it can handle the jfif file format many of the earliest commercial releases are not and never will be compatible with anyone else s files b if you are looking for source code to work with free portable c code for jpeg compression is available from the independent jpeg group which i lead a package containing our source code documentation and some small test files is available from several places the official archive site for this source code is ftp uu net or look under directory graphics jpeg the current release is jpegsrc v tar z this is a compressed tar file don t forget to retrieve in binary mode you can retrieve this file by ftp or uucp if you are on a pc and don t know how to cope with tar z format you may prefer zip format which you can find at simtel and mirror sites see note above file msdos graphics jpegsrc zip this file will also be available on compuserve in the graphsupport forum go pics library as jpsrc zip if you have no ftp access you can retrieve the source from your nearest comp sources misc archive version appeared as issues of volume if you don t know how to retrieve comp sources misc postings see the faq article how to find sources referred to at the top of section the free jpeg code provides conversion between jpeg jfif format and image files in gif pbmplus ppm pgm utah rle and truevision targa file formats the core compression and decompression modules can easily be reused in other programs such as image viewers the package is highly portable we have tested it on many machines ranging from pcs to crays we have released this software for both noncommercial and commercial use companies are welcome to use it as the basis for jpeg related products we do not ask a royalty although we do ask for an acknowledgement in product literature see the readme file in the distribution for details we hope to make this software industrial quality although as with anything that s free we offer no warranty and accept no liability the independent jpeg group is a volunteer organization if you d like to contribute to improving our software you are welcome to join what s all this hoopla about color quantization most people don t have full color bit per pixel display hardware typical display hardware stores or fewer bits per pixel so it can display or fewer distinct colors at a time to display a full color image the computer must map the image into an appropriate set of representative colors this process is called color quantization this is something of a misnomer color selection would be a better term we re stuck with the standard usage though clearly color quantization is a lossy process it turns out that for most images the details of the color quantization algorithm have much more impact on the final image quality than do any errors introduced by jpeg except at the very lowest jpeg quality settings since jpeg is a full color format converting a color jpeg image for display on bit or less hardware requires color quantization this is true for all color jpegs even if you feed a or less color gif into jpeg what comes out of the decompressor is not colors but thousands of colors this happens because jpeg s lossiness affects each pixel a little differently so two pixels that started with identical colors will probably come out with slightly different colors each original color gets smeared into a group of nearby colors therefore quantization is always required to display a color jpeg on a colormapped display regardless of the image source the only way to avoid quantization is to ask for gray scale output incidentally because of this effect it s nearly meaningless to talk about the number of colors used by a jpeg image even if you attempted to count the number of distinct pixel values different jpeg decoders would give you different results because of roundoff error differences i occasionally see posted images described as color jpeg this tells me that the poster a hasn t read this faq and b probably converted the jpeg from a gif jpegs can be classified as color or gray scale just like photographs but number of colors just isn t a useful concept for jpeg on the other hand a gif image by definition has already been quantized to or fewer colors a gif does have a definite number of colors in its palette and the format doesn t allow more than palette entries for purposes of usenet picture distribution gif has the advantage that the sender precomputes the color quantization so recipients don t have to this is also the disadvantage of gif you re stuck with the sender s quantization if the sender quantized to a different number of colors than what you can display you have to re quantize resulting in much poorer image quality than if you had quantized once from a full color image furthermore if the sender didn t use a high quality color quantization algorithm you re out of luck for this reason jpeg offers the promise of significantly better image quality for all users whose machines don t match the sender s display hardware jpeg s full color image can be quantized to precisely match the user s display hardware furthermore you will be able to take advantage of future improvements in quantization algorithms there is a lot of active research in this area or purchase better display hardware to get a better view of jpeg images you already have with a gif you re stuck forevermore with what was sent it s also worth mentioning that many gif viewing programs include rather shoddy quantization routines if you view a color gif on a color ega display for example you are probably getting a much worse image than you need to this is partly an inevitable consequence of doing two color quantizations one to create the gif one to display it but often it s also due to sloppiness jpeg conversion programs will be forced to use high quality quantizers in order to get acceptable results at all and in normal use they will quantize directly to the number of colors to be displayed thus jpeg is likely to provide better results than the average gif program for low color resolution displays as well as high resolution ones finally an ever growing number of people have better than bit display hardware already bit hi color pc displays true bit displays on workstations and macintoshes etc for these people gif is already obsolete as it cannot represent an image to the full capabilities of their display jpeg images can drive these displays much more effectively thus jpeg is an all around better choice than gif for representing images in a machine independent fashion how does jpeg work the buzz words to know are chrominance subsampling discrete cosine transforms coefficient quantization and huffman or arithmetic entropy coding this article s long enough already so i m not going to say more than that here for technical information see the comp compression faq this is available from the news answers archive at rtfm mit edu in files pub usenet news answers compression faq part if you need help in using the news answers archive see the top of this article what about lossless jpeg there s a great deal of confusion on this subject the jpeg committee did define a truly lossless compression algorithm i e one that guarantees the final output is bit for bit identical to the original input however this lossless mode has almost nothing in common with the regular lossy jpeg algorithm and it offers much less compression at present very few implementations of lossless jpeg exist and all of them are commercial saying q to the free jpeg software does not get you a lossless image what it does get rid of is deliberate information loss in the coefficient quantization step there is still a good deal of information loss in the color subsampling step with the v free jpeg code you can also say sample x to turn off subsampling keep in mind that many commercial jpeg implementations cannot cope with the resulting file even with both quantization and subsampling turned off the regular jpeg algorithm is not lossless because it is subject to roundoff errors in various calculations the maximum error is a few counts in any one pixel value it s highly unlikely that this could be perceived by the human eye but it might be a concern if you are doing machine processing of an image at this minimum loss setting regular jpeg produces files that are perhaps half the size of an uncompressed bit per pixel image true lossless jpeg provides roughly the same amount of compression but it guarantees bit for bit accuracy if you have an application requiring lossless storage of images with less than bits per pixel per color component you may want to look into the jbig bilevel image compression standard this performs better than jpeg lossless on such images jpeg lossless is superior to jbig on images with or more bits per pixel furthermore jpeg is public domain at least with a huffman back end while the jbig techniques are heavily covered by patents why all the argument about file formats strictly speaking jpeg refers only to a family of compression algorithms it does not refer to a specific image file format the jpeg committee was prevented from defining a file format by turf wars within the international standards organizations since we can t actually exchange images with anyone else unless we agree on a common file format this leaves us with a problem in the absence of official standards a number of jpeg program writers have just gone off to do their own thing and as a result their programs aren t compatible with anybody else s the closest thing we have to a de facto standard jpeg format is some work that s been coordinated by people at c cube microsystems they have defined two jpeg based file formats jfif jpeg file interchange format a low end format that transports pixels and not much else tiff jpeg aka tiff an extension of the aldus tiff format tiff is a high end format that will let you record just about everything you ever wanted to know about an image and a lot more besides tiff is a lot more complex than jfif and may well prove less transportable because different vendors have historically implemented slightly different and incompatible subsets of tiff it s not likely that adding jpeg to the mix will do anything to improve this situation both of these formats were developed with input from all the major vendors of jpeg related products it s reasonably likely that future commercial products will adhere to one or both standards i believe that usenet should adopt jfif as the replacement for gif in picture postings jfif is simpler than tiff and is available now the tiff spec has only recently been officially adopted and it is still unusably vague on some crucial details even when tiff jpeg is well defined the jfif format is likely to be a widely supported lowest common denominator tiff jpeg files may never be as transportable a particular case that people may be interested in is apple s quicktime software for the macintosh quicktime uses a jfif compatible format wrapped inside the mac specific pict structure conversion between jfif and quicktime jpeg is pretty straightforward and several mac programs are available to do it see mac portion of section a if you have an editor that handles binary files you can strip a quicktime jpeg pict down to jfif by hand see section for details another particular case is handmade software s programs gif jpg jpg gif and image alchemy these programs are capable of reading and writing jfif format by default though they write a proprietary format developed by hsi this format is not readable by any non hsi programs and should not be used for usenet postings use the j switch to get jfif output this applies to old versions of these programs the current releases emit jfif format by default you still should be careful not to post hsi format files unless you want to get flamed by people on non pc platforms how do i recognize which file format i have and what do i do about it if you have an alleged jpeg file that your software won t read it s likely to be hsi format or some other proprietary jpeg based format you can tell what you have by inspecting the first few bytes of the file a jfif standard file will start with the characters hex ff d ff e followed by two variable bytes often hex followed by jfif if you see ff d at the start but not the rest of it you may have a raw jpeg file this is probably decodable as is by jfif software it s worth a try anyway hsi files start with hsi you re out of luck unless you have hsi software portions of the file may look like plain jpeg data but they won t decompress properly with non hsi programs a macintosh pict file if jpeg compressed will have a couple hundred bytes of header followed by a jfif header scan for jfif strip off everything before the ff d and you should be able to read it anything else it s a proprietary format or not jpeg at all if you are lucky the file may consist of a header and a raw jpeg data stream if you can identify the start of the jpeg data stream look for ff d try stripping off everything before that in uuencoded usenet postings the characteristic jfif pattern is begin line m c x whereas uuencoded hsi files will start with begin line m i if you learn to check for the former you can save yourself the trouble of downloading non jfif files what about arithmetic coding the jpeg spec defines two different back end modules for the final output of compressed data either huffman coding or arithmetic coding is allowed the choice has no impact on image quality but arithmetic coding usually produces a smaller compressed file on typical images arithmetic coding produces a file or percent smaller than huffman coding all the file size numbers previously cited are for huffman coding unfortunately the particular variant of arithmetic coding specified by the jpeg standard is subject to patents owned by ibm at t and mitsubishi thus you cannot legally use arithmetic coding unless you obtain licenses from these companies the fair use doctrine allows people to implement and test the algorithm but actually storing any images with it is dubious at best at least in the short run i recommend that people not worry about arithmetic coding the space savings isn t great enough to justify the potential legal hassles in particular arithmetic coding should not be used for any images to be exchanged on usenet there is some small chance that the legal situation may change in the future stay tuned for further details does loss accumulate with repeated compression decompression it would be nice if having compressed an image with jpeg you could decompress it manipulate it crop off a border say and recompress it without any further image degradation beyond what you lost initially unfortunately this is not the case in general recompressing an altered image loses more information though usually not as much as was lost the first time around the next best thing would be that if you decompress an image and recompress it without changing it then there is no further loss i e you get an identical jpeg file even this is not true at least not with the current free jpeg software it s essentially a problem of accumulation of roundoff error if you repeatedly compress and decompress the image will eventually degrade to where you can see visible changes from the first generation output it usually takes many such cycles to get visible change one of the things on our to do list is to see if accumulation of error can be avoided or limited but i am not optimistic about it in any case the most that could possibly be guaranteed would be that compressing the unmodified full color output of djpeg at the original quality setting would introduce no further loss even such simple changes as cropping off a border could cause further roundoff error degradation if you re wondering why it s because the pixel block boundaries move if you cropped off only multiples of pixels you might be safe but that s a mighty limited capability the bottom line is that jpeg is a useful format for archival storage and transmission of images but you don t want to use it as an intermediate format for sequences of image manipulation steps use a lossless format ppm rle tiff etc while working on the image then jpeg it when you are ready to file it away aside from avoiding degradation you will save a lot of compression decompression time this way what are some rules of thumb for converting gif images to jpeg as stated earlier you will lose some amount of image information if you convert an existing gif image to jpeg if you can obtain the original full color data the gif was made from it s far better to make a jpeg from that but if you need to save space and have only the gif to work from here are some suggestions for getting maximum space savings with minimum loss of quality the first rule when converting a gif library is to look at each jpeg to make sure you are happy with it before throwing away the corresponding gif that will give you a chance to re do the conversion with a higher quality setting if necessary some gifs may be better left as gifs as explained in section in particular cartoon type gifs with sixteen or fewer colors don t convert well you may find that a jpeg file of reasonable quality will be larger than the gif so check the sizes too experience to date suggests that large high visual quality gifs are the best candidates for conversion to jpeg they chew up the most storage so offer the most potential savings and they convert to jpeg with least degradation don t waste your time converting any gif much under kbytes also don t expect jpeg files converted from gifs to be as small as those created directly from full color originals to maintain image quality you may have to let the converted files be as much as twice as big as straight through jpeg files would be i e shoot for or rd the size of the gif file not th as suggested in earlier comparisons many people have developed an odd habit of putting a large constant color border around a gif image while useless this was nearly free in terms of storage cost in gif files it is not free in jpeg files and the sharp border boundary can create visible artifacts ghost edges do yourself a favor and crop off any border before jpeging if you are on an x windows system xv s manual and automatic cropping functions are a very painless way to do this cjpeg s default q setting of is appropriate for full color input but for gif inputs q settings of to often seem to be necessary to avoid image degradation if you apply smoothing as suggested below the higher q setting may not be necessary color gifs of photographs or complex artwork are usually dithered to fool your eye into seeing more than the colors that gif can actually store if you enlarge the image you will see that adjacent pixels are often of significantly different colors at normal size the eye averages these pixels together to produce the illusion of an intermediate color value the trouble with dithering is that to jpeg it looks like high spatial frequency color noise and jpeg can t compress noise very well the resulting jpeg file is both larger and of lower image quality than what you would have gotten from jpeging the original full color image if you had it to get around this you want to smooth the gif image before compression smoothing averages together nearby pixels thus approximating the color that you thought you saw anyway and in the process getting rid of the rapid color changes that give jpeg trouble appropriate use of smoothing will often let you avoid using a high q factor thus further reducing the size of the compressed file while still obtaining a better looking output image than you d get without smoothing with the v free jpeg software or products based on it a simple smoothing capability is built in try smooth or so when converting gifs values of to seem to work well for high quality gifs heavy handed dithering may require larger smoothing factors if you can see regular fine scale patterns on the gif image even without enlargement then strong smoothing is definitely called for too large a smoothing factor will blur the output image which you don t want if you are an image processing wizard you can also do smoothing with a separate filtering program such as pnmconvol from the pbmplus package however cjpeg s built in smoother is a lot faster than pnmconvol the upshot of all this is that cjpeg quality smooth is probably a good starting point for converting gifs but if you really care about the image you ll want to check the results and maybe try a few other settings for more information about jpeg in general or the free jpeg software in particular contact the independent jpeg group at jpeg info uunet uu net tom lane organizer independent jpeg group internet tgl cs cmu edu bitnet tgl cs cmu edu carnegie
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713 | comp.graphics | re cview answers well the temp file thing creates an obvious problem it is impossible to use cview for viewing cd rom based picture collections and it is the only non windows viewer that works properly with my cirrus based bit vga
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714 | comp.graphics | re cview answers re majority of users not readding from floppy well how about those of us who have picture cd roms and would like to use cview because it is fast and it works well but can t because the moron lacked the foresight to create the temp file in the program s path not the current didrectory
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715 | comp.graphics | needed plotting package that does looking for a graphics cad or whatever package on a x unix box that will take a file with records like n a b p where n a count integer a entity a string b entity b string p type string and produce a networked graph with nodes represented with boxes or circles and the vertices represented by lines and the width of the line determined by n there would be a different line type for each type of vertice the boxes need to be identified with the entity s name the number of entities and vertices it would be nice if the tool minimized line cross overs and did a good job of layout i have looked in the faq for comp graphics and gnuplot without success any ideas would be appreciated thanks glen fullmer glen fullmer pts mot com for a successful technology reality must take precedence over public relations for nature cannot be fooled richard p feynman
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716 | comp.graphics | re video in out organization a world of information at your fingertips keywords in article toontown columbiasc ncr com craig toontown columbiasc ncr com craig s williamson writes i m getting ready to buy a multimedia workstation and would like a little advice i need a graphics card that will do video in and out under windows i was originally thinking of a targa but that doesn t work under windows what cards should i be looking into thanks craig to forgive is divine to be craig williamson an airhead is human craig williamson columbiasc ncr com balki bartokomas craig toontown columbiasc ncr com home perfect strangers craig you should still consider the targa i run windows on it all the time at work and it works fine i think all you need is the right driver josh west email mscrap halcyon com
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717 | comp.graphics | gl and fli specs can somebody point out to me where i can find the specs for gl and fli files found on pc s arthur qedbbs com arthur choung or qed arthur the qed bbs
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718 | comp.graphics | re ms windows graphics viewer check out image pals v from u lead until may special intro price it has the basic image processing tools for all major formats does screen grabbing and allows all your image files to be calalogged into a thumbnail database it s great don
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719 | comp.graphics | re ms windows screen grabber summary hi again many thanks to all the people who responded to my request for a ms windows screen grabber it proves to me again that the net is a wonderful thing so in summary there are two choices various screen grabber packages corel draw has one there are a couple on simtel and cica use the built in printscreen and alt printscreen functionality to paste the screen or window to the clipboard then paste the clipboard to your application cool again thanks for the info grant the ms windows newbie unix and x are my bag grant totten programmer analyst trent university peterborough ontario gtotten trentu ca phone fax a woman s place is in the wrong james thurber
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720 | comp.graphics | tiff next appsoft draw gif conversion okay all my friends are bitching at me that the map i made in appsoft draw can t be displayed in xv i checked it s true at least with version my readers on the next have very little trouble on it preview messes up the eps but does fine with the tiff and imageviewer a behaves with flying colors except it doesn t convert worth please is there any way i can convert this drw from appsoft on the next to something more reasonable like gif i have access to a sun and nextstep systems any good reliable conversion programs would be helpful please email i ll post responses if anyone wants me to please email that to yes i used alphachannel god i could choke steve jobs right now yes i know how to archie but tell me what to archie for also is there a way to convert to ps plain format imageviiewer turns out nothing recognizable terrychay small editorial rw r r tychay apr undernet tiff rw r r tychay apr undernet tiff z and not using gzip is it me or is there something wrong with this format
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721 | comp.graphics | d bitmap interpolation yesterday i wrote a program to do bilinear interpolation ala numerical recipes with the pbmplus libraries i m pretty happy with the results but i m looking for any already coded non linear interpolation schemes before i go ahead an try to write one any pointers dave disser um caen user services wealth is wasted disser engin umich edu chrysler center on the old ann arbor mi
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722 | comp.graphics | cd rom indexes available the file and contents listings for knowledge media resource library graphics knowledge media resource library audio are now available for anonymous ftp from cdrom com
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723 | comp.graphics | re so what is the fastest windows video c in article apr exu ericsson se ebuhcb ebu ericsson se writes in article apr trentu ca ayounes trentu ca amro younes trent university c c peterborough on canada k j b writes i have the ati graphics ultra pro eisa version i must admit it has received bad press but that was due to the faulty drivers it had pc magazine seems to be impressed with the ati card in their most recent reviews in the april th issue they rate the ati graphics ultra pro eisa version as their editor s choice they noted that the drivers had improved since they tested the isa version in january cuyler yeah they also gave it their editor s choice in the run down of graphics accelerators they tested in the previous issue which is why i bought and then returned mine the only conclusion i can come up with is that pc magazine has wildly different ways on determining the worthiness of a video card than i do david farley the university of chicago library east th street jrl dgf midway uchicago edu chicago illinois
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724 | comp.graphics | help need jpeg mpeg encod decode i am involve in a distant learning project and am in need of jpeg and mpeg encode decode source and object code this is a not for profit project that once completed i hope to release to other educational and institutional learning centers this project requires that true photographic images be sent over plain telephone lines in addition if there is a real good gui lib with d objects and all types of menu classes that can be use at both end of the transaction server and terminal end i would like to hear about it we recently posted an rfd announcing the otg open telematic group that will concern itself with the developement of such application and that it would incorporate naplps jpeg mpeg voice ivr fax sprites animation fli flc etc at present only dos and unix environment is being worked on and it our hope that we can generate enough interest where all the major platform can be accomodated via a plaform independent api toolkit sdk we are of the mind that it is about time that such project and group be form to deal with these issues we want to setup a repository where these files may be access such as simte and start putting together a otg faq if you have some or any information that in your opinion would be of interest to the otg community and you like to see included in our first faq please send it email to the address below thanks in advance ed p o box atlanta ga zyxel epimntl world std com ed pimentel gisatl fidonet org edimg willard atl ga us ed pimentel gatech kd nc vdbsan willard edimg emory uumind willard edimg willard s house bbs atlanta ga
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725 | comp.graphics | scanned grey to color equations a while back someone had several equations which could be used for changing f iltered grey scale images into one true color image this is possible because it s the same theory used by most color scanners i am not looking for the obv ious solution which is to buy a color scanner but what i do need is those equat ions becasue i am starting to write software which will automate the conversion process i would really appreciate it if someone would repost the equations unknowns thanks for the help
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726 | comp.graphics | pov tga s and speedstar i finally got a bit viewer for my povray generated tga files it was written in c by sean malloy and he kindly sent me a copy he wrote it for the same purpose to view tga files using his speedstar it only works with the speedstar and i cannot send copies since it is not my program i believe the author may release a version at a future time when the program is more developed he may or may not comment on this as he pleases thanks to all who were helpful regards jim nobles
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727 | comp.graphics | need algorithm for reading and displaying bitmap files i m making a customized paint program in dos and need an algorithm for reading bitmap files like gif pcx or bmp does anyone have such an algorithm i ve tried copying one out of a book for reading pcx format but it doesn t work i will take an algorithm for any format that can be created from windows paint thanks toni
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728 | comp.graphics | images of earth i am looking for some graphic images of earth shot from space preferably bit color but color gif s will do anyways if anyone knows an ftp site where i can find these i d greatly appreciate it if you could pass the information on thanks please send email ken huisman ken cs ualberta ca
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729 | comp.graphics | re sphere from points in article qkgbuinns n shelley u washington edu bolson carson u washington edu edward bolson writes given points non coplanar how does one find the sphere that is center and radius exactly fitting those points finding the circumcenter of a tetrahedron is discussed on page in contouring a guide to the analysis and display of spatial data by dave watson pergamon press isbn p each pair of tetrahedral vertices define a plane which is a perpendicular bisector of the line between that pair express each plane in the form ax by cz d and solve the set of simultaneous equations from any three of those planes that have a vertex in common all vertices are used the solution is the circumcenter dave watson internet watson maths uwa edu au department of mathematics the university of western australia tel nedlands wa australia fax
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730 | comp.graphics | paintprogram wanted excuse the sheer newbieness of this post but i am looking for a decent paintprogram which will save to various file formats bmp pcx etc etc via ftp freeware or shareware i would like to check out the available programs for little before i check out the commercial market thanks in advance for any help or direction you can give me daemon
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731 | comp.graphics | vesa as a graphics standard in the u ibm pc world how much of a standard has vesa become for svga graphics i know there are lots of graphics board companies out there as well as several graphics chips manufacturers are they adhering to the vesa standard and what effect is will the vesa local bus have on all of this anyone
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732 | comp.graphics | where s dmorf could anyone direct me to the ftp site where i can find the dos based morphing package called dmorf zip i had downloaded this file last week but the new dos crashed my hard drive and i lost it now i can t find the site where i got it from also are there any other morphing packages out for dos freeware or shareware thanks in advance barry egerter obelix gaul csd uwo ca author of wgt graphics toolkit for vga version now available turbo borland c or better joystick mouse graphics primitives non bgi power gif pcx data storage sprites multiway scrolling games bitmap warping resizing sb support fli egerter obelix gaul csd uwo ca
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733 | comp.graphics | re sphere from points i plan to post a summary of responses to this as soon as i have working code which i will also include the intersection of planes method looks best but my implementation based on a short article in graphics gems i doesn t work i may be misinterpreting of course i had avoided the simultaneous solution of the plane equations in favor of dot and cross products but the former may actually be better in either case a matrix determinant needs to be computed implicitly in the solution of linear equations to get the planes i was taking the midpoint of the line from say p to p and setting the normal as the normalized vector from p to p these just plugged into the formula in graphics gems however the resulting center point is only occasionally equidistant from all of my test points for different tests my matrix vector math is very rusty but it looks like i need to verify the formula or use the simultaneous equation solution which will require bringing in another routine i don t have but should be easy to find another method is to first find the center of the circle defined by sets of points and intersecting the normals from there this would also define the circle center however small numerical imprecisions would make the lines not intersect supposedly planes have to intersect in a unique point if they are not parallel ed thanks to all who answered so far ed bolson university of washington cardiovascular research bolson u washington edu preferred bolson max bitnet bolson milton u washington edu if you must
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734 | comp.graphics | sphere from points another method is to first find the center of the circle defined by sets of points and intersecting the normals from there this would also define the circle center however small numerical imprecisions would make the lines not intersect supposedly planes have to intersect in a unique point if they are not parallel having thought about this why don t you project the lines onto the d plane formed by the lines do an intersection calculation in the plane in d where you re guaranteed a unique solution unless they re parallel which won t happen in this case and then use parametric distance along the lines from the circle centres to determine the exact point of interest this bypasses the messy error propogation required to do the calculation in d hope i haven t put my foot in it again steve steven collins email steve crl hitachi co jp visiting computer graphics researcher phone hitachi central research lab tokyo fax
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735 | comp.graphics | re rumours about do in article apr rchland ibm com ricardo rchland vnet ibm com ricardo hernandez muchado writes in article apr mercury unt edu sean mcmains mcmains unt edu writes ricardo the animation playback to which lawrence was referring in an earlier post is plain old quicktime with the compact video codec i ve seen digitized video some of apple s early commercials to be precise running on a centris at about fps very nicely bit color depth i would expect that using the same algorithm a risc processor should be able to approach full screen full motion animation though as you ve implied the processor will be taxed more with highly dynamic material sean i don t want to get into a mini war by what i am going to say but i have to be a little bit skeptic about the performance you are claiming on the centris you ll see why please no flames i reserve those for c s m a i was in chicago in the last consumer electronics show and apple had a booth there i walked by and they were showing real time video capture using a radious or supermac card to digitize and make right on the spot quicktime movies i think the quicktime they were using was the old one that is in fact the current version it only came out in december they digitized a guy talking there in x xx something it played back quite nicely and in real time the guy then expanded the window resized to x by xx in y i think and the frame rate decreased enough to notice that it wasn t fps or about fps anymore it dropped to like fps then he increased it just a bit more and it dropped to fps then i asked him what mac he was using he was using a quadra don t know what model to do it and he was telling the guys there that the quicktime could play back at the same speed even on an lcii well i spoiled his claim so to say since a quadra mac was having a little bit of trouble and this wasn t even from the hardisk this was from memory my test movie was created at resolution it wasn t being scaled up scaling was a very cpu intensive operation with the original quicktime the current version has optimizations for ratios like but even so i m prepared to believe that the performance isn t as good as with playing back an actual movie i haven t done any numerical measurements for scaled playback lawrence d oliveiro fone computer services dept fax university of waikato electric mail ldo waikato ac nz hamilton new zealand s e gmt
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736 | comp.graphics | chaos editions idea internation directory of electronic arts i ve borrowed the version of this book from a friend holy moley what a wealth of contacts five hundred pages of information about electronic artists and organizations around the globe many have email addresses an up to the minute database of this information is also available on minitel the book s based in france are there any internet minitel gates the book is printed in french and english to have you or your organization listed in idea just send your information to annick bureaud idea rue falguiere paris france it s free to be listed in it i m not sure how widely distributed the book is or how much it costs i m not affiliated with them in any way i was just impressed by their collection of organizations and artists i highly encourage all involved in electronic media video music graphics animation etc to send in your entry and encourage them to make their database available on internet e ed stastny otis project end process sound news and arts po bx ftp sunsite unc edu pub multimedia pictures otis omaha ne projects otis email ed cwis unomaha edu ed sunsite unc edu
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737 | comp.graphics | re images of earth in apr kakwa ucs ualberta ca ken cs ualberta ca huisman kenneth m writes i am looking for some graphic images of earth shot from space preferably bit color but color gif s will do anyways if anyone knows an ftp site where i can find these i d greatly appreciate it if you could pass the information on thanks try ftp ing at pub info jpl nasa gov simple dir structure and ames arc nasa gov at pub space gif and pub space jpeg sorry only bits gifs and jpegs great piccy s though try the x gif files they re semi huge gif a files watch out gif a dead ahead good luck good software to be found out there too jurriaan jhwitten cs ruu nl jhwitten cs ruu nl jurriaan wittenberg department of computerscience utrecht the netherlands
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738 | comp.graphics | re rumours about do in article bd news service uci edu rbarris orion oac uci edu robert c barris writes i m not sure how a centris mhz stacks up against the mhz arm in the do box obviously the arm is faster but how much why would it have to be much faster it probably is assuming an arm is about as efficient as a mips r for integer calculations doing a compact video like digital video codec is an easy task for software motion pictures which is a lot like compact video though it predates it we get frames sec at x on a decstation that machine has a mhz mips r burkhard neidecker lutz distributed multimedia group cec karlsruhe eerp portfolio manager software motion pictures berkom ii project multimedia base technology digital equipment corporation neidecker nestvx enet dec com
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739 | comp.graphics | re sphere from points spworley netcom com steve worley writes bolson carson u washington edu edward bolson writes boy this will be embarassing if it is trivial or an faq given points non coplanar how does one find the sphere that is center and radius exactly fitting those points i know how to do it for a circle from points but do not immediately see a straightforward way to do it in d i have checked some geometry books graphics gems and farin but am still at a loss please have mercy on me and provide the solution it s not a bad question i don t have any refs that list this algorithm either but thinking about it a bit it shouldn t be too hard take three of the points and find the plane they define as well as the circle that they lie on you say you have this algorithm already find the center of this circle the line passing through this center perpendicular to the plane of the three points passes through the center of the sphere repeat with the unused point and two of the original points this gives you two different lines that both pass through the sphere s origin their interection is the center of the sphere the radius is easy to compute it s just the distance from the center to any of the original points i ll leave the math to you but this is a workable algorithm good i had a bad feeling about this problem because of a special case with no solution that worried me four coplanar points in the shape of a square have no unique sphere that they are on the surface of similarly colinear point have no finite sized sphere that they are on the surface of these algorithms being geometrical designed rather than algebraically design meet these problems neatly when determining which plane the points are on if they are colinear the algorithm should afil or return infinite r when intersecting the two lines there are possibilities they are the same line the points were on a planar circle they are different lines but parallel there is a sphere of in radius this last case can be achieved with colinier points and any th point by taking the th point and pairs of the first parallel lines will be produced it can also be achieved by if all points are coplanar but are not on one circle it seems to me that the algorithm only fails when the points are coplanar the algorithm always fails when the points are coplanar points being colinear coplanar testing if the th point is coplanar when the plane of the first points has been found is trivial an alternate method would be to take pairs of points the plane formed by the perpendicular bisector of each line segment pair also contains the center of the sphere three pairs will form three planes intersecting at a point this might be easier to implement steve spworley netcom com
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740 | comp.graphics | re images of earth look in the pub space directory on ames arc nasa gov there are a number of earth images there you may have to hunt around the subdirectories as things tend to be filed under the mission ie apollo rather than under the image subject rick
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741 | comp.graphics | re cview answers renew blade stack urc tue nl rene walter writes a very kind soul has mailed me this reply for the bugs in cview since he isn t in the position to post this himself he asked me to post it for him but to leave his name out so here it comes cview has quite a number of bugs the one you mention is perhaps the most a stupid question but what will cview run on and where can i get it i am still in need of a gif viewer for linux without x windows thanks
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742 | comp.graphics | re cview answers in apr whiting mcs com sean whiting mcs com sean gum writes a stupid question but what will cview run on and where can i get it i am still in need of a gif viewer for linux without x windows thanks ho boy there is no way in hell you are going to be able to view gifs or do any other graphics in linux without x windows i love linux because it is so easy to learn you want text okay use linux you want text and graphics use linux with x windows simple painless required to have x windows if you want graphics this includes fancy word processors like doc image viewers like xv etc
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743 | comp.graphics | re cview answers in qlobb p a tuegate tue nl renew blade stack urc tue nl rene walter writes most info regarding dangers of reading from floppy disks omitted unrevcoverable way so be careful it is incredibly poor programming for a program to do this on the other hand when choosing files in the open files menu cview insists on doing a few disk reads every time one moves the hi lighter square incredibly annoying when it could do them all at once when it gets the directory info and really how much effort does it take to sort a directory listing in all fairness how many people do you know personally who read images from floppy drives i haven t tried it with jpegs but i do realize how agonizingly slow it is with gif files nevertheless it is an important bug that needs to be squashed i am merely pointing out that it was probably overlooked while it is serious one must keep in mind that it will probably affect at most of the targeted users of cview
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744 | comp.graphics | re cview answers renew blade stack urc tue nl rene walter writes over where it places its temp files it just places them in its current directory i have to beg to differ on this point as the batch file i use to launch cview cd s to the dir where cview resides and then invokes it every time i crash cview the byte temp file is found in the root dir of the drive cview is on just my cb cyberspace buddha why are you looking for more knowledge when you o cb wixer bga com do not pay attention to what you already know o cb wixer cactus org get out of my chair hillary to god peace
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745 | comp.graphics | help need d graphics code package for dos help i need code package whatever to take d data and turn it into a wireframe surface with hidden lines removed i m using a dos machine and the code can be in ansi c or c ansi fortran or basic the data i m using forms a rectangular grid please post your replies to the net so that others may benefit imho this is a general interest question thank you
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746 | comp.graphics | re vesa on the speedstar just posting to john cormack i wanted to tell you that there is a slight difference between speedstar and speedstar x stefan
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747 | comp.graphics | converting images to hp laserjet iii does anyone know of a good way standard pc application pd utility to convert tif img tga files into laserjet iii format we would also like to do the same converting to hpgl hp plotter files please email any response is this the correct group thanks in advance michael michael collier programmer the computer unit email m p collier uk ac city the city university tel x london fax ec v hb
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748 | comp.graphics | comp graphics programmer hello netters sorry i don t know if this is the right way of doing this kind of thing probably should be a cfv but since i don t have tha ability to create a news group myself i just want to start the discussion i enjoy reading c g very much but i often find it difficult to sort out what i m interested in everything from screen drivers graphics cards graphics programming and graphics programs are discused here what i d like is a comp graphics programmer news group what do you other think arff also for the not religous confessor there is a mystery of higher values who s birth mankind to the last builds upon they are indisputible and often disregarded seldom you hear them beeing prized as seldom as you hear a seeing man prizeing what he sees per lagerkvist the fist free translation from swedish andreas arff andreasa dhhalden no
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749 | comp.graphics | re help need d graphics code package for dos n ba tamvm tamu edu wrote help i need code package whatever to take d data and turn it into a wireframe surface with hidden lines removed i m using a dos machine and the code can be in ansi c or c ansi fortran or basic the data i m using forms a rectangular grid please post your replies to the net so that others may benefit imho this is a general interest question thank you
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750 | comp.graphics | surface intersections i have a problem with intersections between two surfaces does anybody have a easy to understand algorithm for that or maybe even c source marco seirio in real life sp marse caligula his s
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751 | comp.graphics | wanted atomic energy res establishment uk techreport i m looking for the following paper marlow s and powell m j d a fortran subroutine for plotting the part of a conic that is inside a given triangle rep r atomic energy res establishment harwell england or anything related including d cases max max froumentin laboratoire d informatique always better never first fondamentale de lille tigran petrossian france
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752 | comp.graphics | re bit graphics cards i am looking for eisa or vesa local bus graphic cards that support at least x x resolution i know matrox has one but it is very expensive all the other cards i know of that support that resoultion are striaght isa what about the elsa winner s bt mb eisa or the metheus premier vl s bt mb isa vl also are there any x servers for a unix pc that support bits as it just happens sgcs has a xserver x that does x x on those cards please email to info sgcs com for more details thomas das reh springt hoch e mail roell sgcs com das reh springt weit include sys pizza h was soll es tun es hat ja zeit
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753 | comp.graphics | need a viewer for gl files hi the subject says it all is there a pd viewer for gl files for x thanks dominik
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754 | comp.graphics | radiosity radiosity sources wanted when i read the comp graphics group i never found something about radiosity is there anybody interested in out there i would be glad to hear from somebody i am looking for source code for the radiosity method i have already read common literature e g foley i think little examples could help me to understand how radiosity works common languages c c pascal prefered i hope you will help me yours peter
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755 | comp.graphics | borland turbo c libraries for s graphics card i ve recently got hold of a pc with an s card in it and i d like to do some c programming with it are there any libraries out there that will let me access the high resolution modes available via borland turbo c andy
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756 | comp.graphics | re radiosity in article rz uni jena de hahm fossi hab weimar de peter hahm writes radiosity sources wanted when i read the comp graphics group i never found something about radiosity is there anybody interested in out there i would be glad to hear from somebody i am looking for source code for the radiosity method i have already read common literature e g foley i think little examples could help me to understand how radiosity works common languages c c pascal prefered i hope you will help me yours peter peter there s a radiosity package ahead the only problem is there are a few miles to sail let s be serious i m working on a radiosity package written in c i would like to make it public domain i ll announce it in c g the minute i finished it that were the good news the bad news it ll take another months at least to finish it in the meantime you may have a look at the file radiosity code tar z located at compute cc ncsu edu there are some other locations have a look at archie to get the nearest hope that ll help yours stephan stephan amann sig computer graphics university of berne switzerland amann iam unibe ch tel fax projects radiosity raytracing computer graphics
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757 | comp.graphics | re needed plotting package that does in article full gl apr dolphin pts mot com full gl pts mot com glen fullmer writes looking for a graphics cad or whatever package on a x unix box that will take a file with records like n a b p where n a count integer a entity a string b entity b string p type string and produce a networked graph with nodes represented with boxes or circles and the vertices represented by lines and the width of the line determined by n there would be a different line type for each type of vertice the boxes need to be identified with the entity s name the number of entities and vertices it would be nice if the tool minimized line cross overs and did a good job of layout i have looked in the faq for comp graphics and gnuplot without success any ideas would be appreciated thanks glen fullmer glen fullmer pts mot com hi see roger grywalski s response to re help on network visualization in comp graphics visualization amongst other things it does exactly this chris murphy chris alta oh com columbus oh
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758 | comp.graphics | re rumours about do first off thanks to all who have filled me in on the existence of the i assumed rashly that the particular number would be reserved for further enhancements to the motorola line rather than meted out to another company ah well i guess that s what i get when i assume the computer industry will operate in a logical manner in article apr rchland ibm com ricardo hernandez muchado ricardo rchland vnet ibm com writes sean i don t want to get into a mini war by what i am going to say but i have to be a little bit skeptic about the performance you are claiming on the centris you ll see why please no flames i reserve those for c s m a i was in chicago in the last consumer electronics show and apple had a booth there i walked by and they were showing real time video capture using a radious or supermac card to digitize and make right on the spot quicktime movies i think the quicktime they were using was the old one version of quicktime is as has been stated the current version of the software the older version is and is on the horizon in the not too distant future they digitized a guy talking there in x xx something it played back quite nicely and in real time the guy then expanded the window resized to x by xx in y i think and the frame rate decreased enough to notice that it wasn t fps or about fps anymore it dropped to like fps then he increased it just a bit more and it dropped to fps quicktime does a much better job of playing back movies at size than it does playing back resized movies apparently the process of expanding each frame s image and dithering the resultant bitmap to the appropriate bit depth is pretty processor intensive there are optimizers that work pretty well for showing movies at double size but if you drop to x size or increase to x size performance suffers dramatically then i asked him what mac he was using he was using a quadra don t know what model to do it and he was telling the guys there that the quicktime could play back at the same speed even on an lcii he lied quicktime is very cpu dependent he was probably confused by the fact that qt is locked to an internal timecode and will play in the same amount of time on any machine however an lc will drop frames in order to keep the sound and video synced up the centris and quadras have similar cpus and will thus boast similar performance though the quadras will be a bit faster due to marginally faster clock speeds and somewhat different architecture well i spoiled his claim so to say since a quadra mac was having a little bit of trouble and this wasn t even from the hardisk this was from memory could it be that you saw either a newer version of quicktime or some hardware assisted centris or another software product running the animation like supposedly macromind s accelerator i expect that the version of the quicktime software you saw was i was using was one of the new codecs in v allows video at nearly twice the size and the same frame rate as what version could handle the centris i saw was a plain vanilla with the exception of the nice speakers that were playing the sound and the software was movie player the qt player apple includes with the software don t misunderstand me i just want to clarify this no problem it still surprises me that quicktime is able to do the things it does as well as it can sean mcmains check out the gopher phone university of north texas new bands info server fax p o box at seanmac acs unt edu e mail denton tx mcmains unt edu
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759 | comp.graphics | re images of earth in c q hk kod hawnews watson ibm com ricky watson ibm com rick turner writes look in the pub space directory on ames arc nasa gov there are a number of earth images there you may have to hunt around the subdirectories as things tend to be filed under the mission ie apollo rather than under the image subject for those of you who don t need bit i got a colour amiga iff of a cloudless earth scanned looks okay when mapped on a sphere e mail me and i ll send it you louis i m hanging on your words living on your breath feeling with your skin will i always be here in your room dm
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760 | comp.graphics | removing distortion from bitmapped drawings let s say you have a scanned image of a line drawing in this case a boat but it could be anything on the drawing you have a set of reference points whose true x y positions are known now you digitize the drawing manually in this case using yaron danon s excellent digitize program that is you use a program which converts cursor positions to x y and saves those values when you click the mouse upon digitizing you notice that the reference point values that come out of the digitizing process differ in small but significant ways from the known true values this is understandable because the scanned drawing is a reproduction of the original and there are successive sources of distortion such as differential expansion and contraction of paper errors introduced in the printing process scanner errors and what have you the errors are not uniform over the entire drawing so global adjustments such as stretching contracting uniformly over x or y or rotating the whole drawing are not satisfactory so the question is does any kind soul know of an algorithm for removing such distortion in particular if i have three sets of points reference x y the known true values distortedreference x y the same points with known errors distorteddata x y other points with unknown errors what function of reference and distorted could i apply to distorteddata to remove the errors i suspect the problem could be solved by treating the distorted reference points as resulting from the projection of a bumpy d surface solving for the surface and then flattening it to remove the errors in the other data points any kind and informed soul out there have any ideas or better yet pointers to treatments of the same or similar problems thanks earl
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761 | comp.graphics | help grasp hi could anyone tell me if it s possible to save each frame of a gl grasp animation to gif jpg iff or any other picture formats i ve got some animations that i d like to transfer to my amiga i really hope that someone can help me cheers haavard nesse trondheim college of engineering trondheim norway
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762 | comp.graphics | re comp graphics programmer in article andreasa dhhalden no andreasa dhhalden no andreas arff writes hello netters sorry i don t know if this is the right way of doing this kind of thing probably should be a cfv but since i don t have tha ability to create a news group myself i just want to start the discussion i enjoy reading c g very much but i often find it difficult to sort out what i m interested in everything from screen drivers graphics cards graphics programming and graphics programs are discused here what i d like is a comp graphics programmer news group what do you other think this sounds wonderful but it seems no one either wants to spend time doing this or they don t have the power to do so for example i would like to see a comp graphics architecture like this comp graphics algorithms d comp graphics algorithms d comp graphics algorithms misc comp graphics hardware comp graphics misc comp graphics software apps however that is almost overkill something more like this would probably make everyone a lot happier comp graphics programmer comp graphics hardware comp graphics apps comp graphics misc it would be nice to see specialized groups devote to d d morphing raytracing image processing interactive graphics toolkits languages object systems etc but these could be posted to a relevant group or have a mailing list organized that way when someone reads news they don t have to see these subject headings which are rather disparate system specific stuff should be under comp sys or comp os programmer need help programming gl modex programming information fast sprites on pc hardware technical stuff speed of weitek p drivers for speedstar x applications oriented stuff vistapro help how good is dstudio best image processing program for amiga programming oriented stuff fast polygon routine needed good morphing alogirhtm wanted best depth sort for triangles which c library to get i wish someone with the power would get a cfd and then a cfv going on this stuff this newsgroup needs it brian
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763 | comp.graphics | re cview answers bryanw rahul net bryan woodworth writes in apr whiting mcs com sean whiting mcs com sean gum writes a stupid question but what will cview run on and where can i get it i am still in need of a gif viewer for linux without x windows thanks ho boy there is no way in hell you are going to be able to view gifs or do any other graphics in linux without x windows i love linux because it is so easy to learn you want text okay use linux you want text and graphics use linux with x windows simple painless required to have x windows if you want graphics this includes fancy word processors like doc image viewers like xv etc ummm i beg to differ a kind soul sent me a program called dpg view that will do exactly what i want view gif images under linux without x windows and it does support all the way up to x the biggest complaint i have is it is painfully slow it takes about minute to display an image i am use to cshow under dos which takes a split second any idea why it is so slow under linux anybody have anything better plus anybody have the docs to dpg view thanks
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764 | comp.graphics | re help need d graphics code package for dos in article apr ugle unit no razor swix nvg unit no runar jordahl writes n ba tamvm tamu edu wrote help i need code package whatever to take d data and turn it into a wireframe surface with hidden lines removed i m using a dos machine and the code can be in ansi c or c ansi fortran or basic the data i m using forms a rectangular grid is a general interest question thank you i m afraid your reply didn t get thru i do appreciate you trying to reply however please try again
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765 | comp.graphics | re postscript drawing prog in article c ecnn qo mentor cc purdue edu nish cv chem purdue edu nishantha i writes could somebody let me know of a drawing utility that can be used to manipulate postscript files i am specifically interested in drawing lines boxes and the sort on postscript contour plots i have tried xfig and i am impressed by it s features however it is of no use since i cannot use postscript files as input for the programme is there a utility that converts postscript to xfig format any help would be greatly appreciated nishantha i think you are too optimistic postscript is a very big language and so the fig format can not be able to be an interpreter of any arbitrary ps code the only program i know to manipulate postscript files is islanddraw i for myself use xfig and include the postscript files converted to epsi format small changes then are possible erasing some letters adding text and so on reinhard
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766 | comp.graphics | siggraph conference on understanding images nyc acm siggraph understanding images subject pace university siggraph conference on understanding images the purpose of this conference is to bring together a breadth of disciplines including the physical biological and computational sciences technology art psychology philosophy and education in order to define and discuss the issues essential to image understanding within the computer graphics context featured topics include psychology perception image analysis design text sound philosophy date friday saturday may time am pm place the pace downtown theater one pace plaza on spruce street between park row gold street ny ny fees pre registration prior to may members non members students proof of f t status required registration after may or on site all attendees registration fee includes brakfast breaks lunch send registration information fees to dr francis t marchese computer science department nyc acm siggraph conference pace university pace plaza room t new york ny voice fax email marchesf pacevm bitnet registration information name title company street address city state zip day phone evening phone fax phone email detailed description artists designers scientists engineers and educators share the problem of moving information from one mind to another traditionally they have used pictures words demonstrations music and dance to communicate imagery however expressing complex notions such as god and infinity or a seemingly well defined concept such as a flower can present challenges which far exceed their technical skills the explosive use of computers as visualization and expression tools has compounded this problem in hypermedia multimedia and virtual reality systems vast amounts of information confront the observer or participant wading through a multitude of simultaneous images and sounds in possibly unfamiliar representions a confounded user asks what does it all mean since image construction transmission reception decipherment and ultimate understanding are complex tasks strongly influenced by physiology education and culture and since electronic media radically amplify each processing step then we as electronic communicators must determine the fundamental paradigms for composing imagery for understanding therefore the purpose of this conference is to bring together a breadth of disciplines including but not limited to the physical biological and computational sciences technology art psychology philosophy and education in order to define and discuss the issues essential to image understanding within the computer graphics context featured speakers include psychology perception marc de may university of ghent beverly j jones university of oregon barbara tversky standfor university michael j shiffer mit tom hubbard ohio state university image analysis a ravishankar rao ibm watson research center nalini bhusan smith college xiaopin hu university of illinois narenda ahuja university of illinois les m sztander university of toledo design mark bajuk university of illinois alyce kaprow mit text xia lin pace university john loustau hunter college jong ding wang hunter college judson rosebush judson rosebush co sound matthew witten university of texas robert wyatt center for high performance computing robert s williams pace university rory stuart nynex philosophy michael heim education foundation of dpma
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767 | comp.graphics | re fake virtual reality mike peredo mindlink bc ca mike peredo writes the most ridiculous example of vr exploitation i ve seen so far is the virtual reality clothing company which recently opened up in vancouver as far as i can tell it s just another chic clothes spot although it would be interesting if they were selling virtual clothing e mail me if you want me to dig up their phone and you can probably get some promotional lit i understand there have been a couple of raves in la billing themselves as virtual reality parties what i hear they do is project gif images around on the walls as well as run animations through a newtek toaster seems like we need to adopt the term really virtual reality or something except for the non immersive stuff which is virtually really virtual reality etc mp samuel pratice safe signature prevent dangerous signature virii guildenstern our names shouted in a certain dawn a message a summons there must have been a moment at the beginning where we could have said no but somehow we missed it
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768 | comp.graphics | re removing distortion from bitmapped drawings in article apr sctc com boebert sctc com earl boebert writes let s say you have a scanned image of a line drawing in this case a boat but it could be anything on the drawing you have a set of reference points whose true x y positions are known now you digitize the drawing manually in this case using yaron danon s excellent digitize program that is you use a program which converts cursor positions to x y and saves those values when you click the mouse upon digitizing you notice that the reference point values that come out of the digitizing process differ in small but significant ways from the known true values this is understandable because the scanned drawing is a reproduction of the original and there are successive sources of distortion such as differential expansion and contraction of paper errors introduced in the printing process scanner errors and what have you the errors are not uniform over the entire drawing so global adjustments such as stretching contracting uniformly over x or y or rotating the whole drawing are not satisfactory so the question is does any kind soul know of an algorithm for removing such distortion in particular if i have three sets of points reference x y the known true values distortedreference x y the same points with known errors distorteddata x y other points with unknown errors what function of reference and distorted could i apply to distorteddata to remove the errors i suspect the problem could be solved by treating the distorted reference points as resulting from the projection of a bumpy d surface solving for the surface and then flattening it to remove the errors in the other data points it helps to have some idea of the source of the distortion or at least a reasonable model of the class of distortion below is a very short description of the process which we use if you have further questions feel free to poke me via e mail assume locally smooth distortion compute the delaunay triangulation of your x y points this defines the set of neighbors for each point if your data are not naturally convex you may have very long edges on the convex hull consider deleting these edges now there are two goals a move the distorteddata x y to the reference x y b keep the length e as measured from the current x y s as close as possible to the digitizedlength e as measured using the digitized x y s for every point compute a displacement based on a and b for example a for x y points for which you know the reference x y you can move alpha reference x y current x y this will slowly move the distortedreference x y towards the reference x y b for all other points examine the current length of each edge for each edge compute a displacement which would make that edge the correct length where correct is the digitizedlength take the vector sum of these edge displacements and move the point alpha sumofedgedisplacements this will keep the triangulated mesh consistent with your digitized mesh iterate until you are happy for example no point moves very much alpha and alpha need to be determined by experimentation consider how much you believe the reference x y i e do you absolutely insist on the final points exactly matching the references or do you want to balance some error in matching the reference against changes in length of the edges warning there are a couple of geometric invariants which must be observed essentially you can t allow the convex hull to change and you can t allow triangles to fold over neighboring triangles both of these can be handled either by special case checks on the motion of individual points or by periodically re triangulating the points using the current positions but still calculating digitizedlength from the original positions when we first did this the triangulation time was prohibitive so we only did it once if i were motivated to try and change code that has been working in production mode for years i might go back and re triangulate on every iteration if you have more compute power than you know what to do with you might consider having every point interact with every other point but first read up on linear solutions to the n body problem there are lots of papers in the last years of siggraph proceedings on springs constraints and energy calculations which are relevant the above method is described in more or less detail in inproceedings sloan author sloan jr kenneth r and david meyers and christine a curcio title reconstruction and display of the retina booktitle proceedings graphics interface vision interface address vancouver canada pages month may year techreport curcio b author christine a curcio and kenneth r sloan and david meyers title computer methods for sampling reconstruction display and analysis of retinal whole mounts number tr institution department of computer science university of washington address seattle wa month december year article curcio author christine a curcio and kenneth r sloan and david meyers title computer methods for sampling reconstruction display and analysis of retinal whole mounts journal vision research volume number pages year kenneth sloan computer and information sciences sloan cis uab edu university of alabama at birmingham a campbell hall uab station fax birmingham al
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769 | comp.graphics | outlining of spline surface about a year ago i started work on a problem that appeared to be very simple and turned out to be quite difficult i am wondering if anyone on the net has seen this problem and hopefully some published solutions to it the problem is to draw an outline of a surface defined by two roughly parallel cubic splines for inputs the problem essentially starts with two sets of points where each set of points is on the edge of an object which we treat as two dimensional i e only extant between the edges but which exists in three dimensional space to draw the object we fit a cubic spline through the points each spline is effectively computed as a sequence of line segments approximating the curve each spline has an equal number of segments we assume that the nth segment along each spline is roughly but not exactly the same distance along each spline by any reasonable measure take each segment n along each spline and match it to the nth segment of the opposing spline use the pair of segments to form two triangles which will be filled in to color the surface depth sort the triangles take each triangle in sorted order project onto a d pixmap draw and color the triangle take the edge of the triangle that is along the edge of the surface and draw a line along that edge colored with a special edge color it is the edge coloring in step that is at the heart of the problem the idea is to effectively outline the edge of the surface the net result however generally has lots of breaks and gaps in the edge of the surface the reasons for this are fairly complicated they involve both rasterization problems and problems resulting from the projecting the splines if anything about this problem sounds familiar we would appreciate knowing about other work in this area thanks
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770 | comp.graphics | flat globe does anybody have an algorithm for flattening out a globe or any other parametric surface that is definied parametrically that is i would like to take a sheet of paper and a knife and to be able to calculate how i must cut in the paper so i can fold it to a globe or any other object marco seirio in real life sp marse caligula his se
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771 | comp.graphics | re images of earth in article apr cs ruu nl clldomps cs ruu nl louis van dompselaar writes in c q hk kod hawnews watson ibm com ricky watson ibm com rick turner writes look in the pub space directory on ames arc nasa gov there are a number of earth images there you may have to hunt around the subdirectories as things tend to be filed under the mission ie apollo rather than under the image subject for those of you who don t need bit i got a colour amiga iff of a cloudless earth scanned looks okay when mapped on a sphere e mail me and i ll send it you beware there is only one such copyrighted image and the company that generated is known to protect that copyright that image took hundreds of man hours to build from the source satellite images so it is unlikely that competing images will appear soon
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772 | comp.graphics | newsgroup split concerning the proposed newsgroup split i personally am not in favor of doing this i learn an awful lot about all aspects of graphics by reading this group from code to hardware to algorithms i just think making different groups out of this is a wate and will only result in a few posts a week per group i kind of like the convenience of having one big forum for discussing all aspects of graphics anyone else feel this way just curious daemon
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773 | comp.graphics | re surface intersections sp marse lina marco seirio writes i have a problem with intersections between two surfaces does anybody have a easy to understand algorithm for that or maybe even c source marco seirio in real life sp marse caligula his s you also have a severe problem with news headers ftp to cs purdue edu pub vanecek and pull proxima tar z and proxima ps z tres spif lance norskog thinman netcom com data is not information is not knowledge is not wisdom
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774 | comp.graphics | page flipping in vga x x mode help how do you write to the second bank page of memory when in vga x x colour mode ie to perform page flipping animation and buffering of the screen i have tried using the map mask registers but this does not perform the required task although it does do something note it must be able to work on a standard vga ie not necessarily a svga card many thanx in advance andrew
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775 | comp.graphics | imagine hello again netters i finally received the information about imagine for the pc they are presently shipping version of the software and will release version in the first quarter of or so they say the upgrade from to is to purchase imagine it costs or if you are upgrading from another eligible call them for info modeler it is only plus shipping handling it requires a pc with megs a math coprocessor and dos or up and a microsoft mouse and svga card thanks for all your replies about the product i have received many contrasting replies but once i scrounge the money together i think i will take the plunge thanks again here is the info for impulse if you want to find out more or get the sheet they sent impulse inc xerxes avenue north minneapolis mn thanks again for all your replies scott scott snowiss sasst pitt edu turn on jack in jack out
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776 | comp.graphics | re pcx to ad freenet carleton ca jw where is there a book or code that will teach me how jw to read and write pcx dbf and gif files jw how do i access the extra ram on my paradise video board jw so i can do paging in the higher vga modes ie x x jw x x jw anybody got a line on a good book to help answer these question here are some that i have that are very good graphics file formats kay and levine isbn supercharged bitmapped graphics rimmer isbn programmer s guide to the ega and vga cards ferraro isbn has a whole chapter on paradise svga dave deluxe
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777 | comp.graphics | vga passthrough cables does anyone know the phone number to a place where i can get a vga passthrough i want to hook up my vga card to my xga card whcih you can can all i need is the cable that connects them it is the same type of cable that you would connect from your vga card to say a video blaster or something thanks brad
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778 | comp.graphics | detecting double points in bezier curves i m looking for any information on detecting and or calculating a double point and or cusp in a bezier curve an algorithm literature reference or mail about this is very appreciated ferdinand
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779 | comp.graphics | re computer graphics to vcr getting an image from a computer monitor to a videotape is harder than it looks the standard vga and ega outputs are very different than the ntsc format used by televisions while there is equipment that will do the conversion it is hard to get your hands on and costs quite a bit if you have access to an amiga computer that has an ntsc output you can transfer certain types of graphic files by modem and tape them from the ntsc output unfortunately this would be frame by frame and would lead to unbelievably scratchy animation unless you had a good amiga animation program otherwise see if your local public access cable station has equipment that you can use
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780 | comp.graphics | re newsgroup split in article quvdoinn e srvr engin umich edu tdawson engin umich edu chris herringshaw writes concerning the proposed newsgroup split i personally am not in favor of doing this i learn an awful lot about all aspects of graphics by reading this group from code to hardware to algorithms i just think making different groups out of this is a wate and will only result in a few posts a week per group i kind of like the convenience of having one big forum for discussing all aspects of graphics anyone else feel this way just curious daemon i agree with you raist new a owner in x in y in colors from a bit palette i love it new low fat sig don t e mail me i don t have a valid address nor can i send e mail
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781 | comp.graphics | ellipse again hi everyone because no one has touched the problem i posted last week i guess my question was not so clear now i d like to describe it in detail the offset of an ellipse is the locus of the center of a circle which rolls on the ellipse in other words the distance between the ellipse and its offset is same everywhere this problem comes from the geometric measurement when a probe is used the tip of the probe is a ball and the computer just outputs the positions of the ball s center is the offset of an ellipse still an ellipse the answer is no ironically dmis an american indutrial standard says it is ellipse so almost all the software which was implemented on the base of dmis was wrong the software was also sold internationaly imagine how many people have or will suffer from this bug how many qualified parts with ellipse were will be discarded and most importantly how many defective parts with ellipse are will be used i was employed as a consultant by a company in los angeles last year to specially solve this problem i spent two months on analysis of this problem and six months on programming now my solution nonlinear is not ideal because i can only reconstruct an ellipse from its entire or half offset it is very difficult to find the original ellipse from a quarter or a segment of its offset because the method i used is not analytical i am now wondering if i didn t touch the base and make things complicated please give me a hint i know you may argue this is not a cg problem you are right it is not however so many people involved in the problem sphere from poits why not an ellipse and why not its offset please post here and let the others share our interests i got several emails from our netters they said they need the summary of the answers yeh usc
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782 | comp.graphics | re newsgroup split in article quvdoinn e srvr engin umich edu tdawson engin umich edu chris herringshaw writes concerning the proposed newsgroup split i personally am not in favor of doing this i learn an awful lot about all aspects of graphics by reading this group from code to hardware to algorithms i just think making different groups out of this is a wate and will only result in a few posts a week per group i kind of like the convenience of having one big forum for discussing all aspects of graphics anyone else feel this way just curious daemon i agree with you of cause i ll try to be a daemon yeh usc
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783 | comp.graphics | wayne rigby sorry to clog up the news group with this message wayne rigby i have the info you requested but for some reason i can not mail it to you please contact me send email address j no real programmer can function without caffeine zen art of internet john s muller muller diego llnl gov muller sisal llnl gov jmuller libserv ic sunysb edu you are not drunk until you have to grab the grass to keep the grass from falling off the earth some stupid comedian
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784 | comp.graphics | re cview answers uk nx mik uky edu bryan k williams writes re majority of users not readding from floppy well how about those of us who have picture cd roms and would like to use cview because it is fast and it works well but can t because the moron lacked the foresight to create the temp file in the program s path not the current didrectory actually the most flexible way to create temp files is to check for a temp or tmp environment variable and create the files on the drive and directory pointedto by the variable this is pretty much a standard for dos windows and os applications what i have to say is my own opinion and has no bearing on any other person or organization including my employer rknight salestech com sales technologies inc
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785 | comp.graphics | help splitting a trimming region along a mesh hi i have a problem i hope some of the gurus can help me solve background of the problem i have a rectangular mesh in the uv domain i e the mesh is a mapping of a d bezier patch into d the area in this domain which is inside a trimming loop had to be rendered the trimming loop is a set of d bezier curve segments for the sake of notation the mesh is made up of cells my problem is this the trimming area has to be split up into individual smaller cells bounded by the trimming curve segments if a cell is wholly inside the area then it is output as a whole else it is trivially rejected does any body know how thiss can be done or is there any algo somewhere for doing this any help would be appreciated thanks ani to get irritated is human to stay cool divine
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786 | comp.graphics | re detecting double points in bezier curves in article ia b w w oeinck waterland wlink nl ferdinan oeinck waterland wlink nl ferdinand oeinck writes i m looking for any information on detecting and or calculating a double point and or cusp in a bezier curve an algorithm literature reference or mail about this is very appreciated there was a very useful article in one of the issues of transactions on graphics i believe maureen stone was one of the authors sorry not to be more specific i don t have the reference here with me the article actually was more general than this giving a way to decide whether a given cubic bezier curve contains cusps intersection points or whatever wierdness the same treatment is also available in siggraph course notes for the course called math for siggraph or something like that dr memory jbulf kpc com
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787 | comp.graphics | re video in out in article apr nwnexus wa com mscrap halcyon com marta lyall writes organization a world of information at your fingertips keywords in article toontown columbiasc ncr com craig toontown columbiasc ncr com craig s williamson writes i m getting ready to buy a multimedia workstation and would like a little advice i need a graphics card that will do video in and out under windows i was originally thinking of a targa but that doesn t work under windows what cards should i be looking into thanks craig to forgive is divine to be craig williamson an airhead is human craig williamson columbiasc ncr com balki bartokomas craig toontown columbiasc ncr com home perfect strangers craig you should still consider the targa i run windows on it all the time at work and it works fine i think all you need is the right driver josh west email mscrap halcyon com at t also puts out two new products for windows model numbers elude me now a bit video board with framegrabber and a bit with same yesterday i was looking at a product at a local software etc store media vision makes a bit color frame capture board that is stand alone and doesnot use the feature connector on your existing video card it claims upto fps live capture as well as single frame from either composite ntsc or s video in and out don lewis djlewis ualr edu
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788 | comp.graphics | stand alone editing suite i need some help we are upgrading our animation video editing stand we are looking into the different type of setups for a b roll and a cuts only station we would like this to be controlled by a computer brand doesnt matter but maybe mac or amiga low end to high end system setups would be very helpful if you have a system or use a system that might be of use could you mail me your system requirements what it is used for and all the hardware and software that will be necessary to set the system up if you need more info you can mail me at eylerken u washington edu thanks in advance ken eylerken u washington edu
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789 | comp.graphics | re help grasp in article apr w baron edb tih no havardn edb tih no haavard nesse o a writes could anyone tell me if it s possible to save each frame of a gl grasp animation to gif jpg iff or any other picture formats if you have the grasp animation system then yes it s quite easy you simply use glib to extract the image each frame in a gl is actually a complete pcx or clp file then use one of many available utilities to convert it if you don t have the grasp package i m afraid i can t help you sorry by the way before you ask grasp graphics animation system for professionals is a commercial product that sells for just over us from most mail order companies i ve seen and no i don t have it corey webb corey webb for in much wisdom is much grief and cbw s vma smsu edu he that increaseth knowledge increaseth bitnet cbw s smsvma sorrow ecclesiastes the s means i am only but first are you experienced speaking for myself jimi hendrix
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790 | comp.graphics | re please recommend d graphics library for mac in article apr kth se d jwa hemul nada kth se jon wtte writes in z b w w cellar org tsa cellar org the silent assassin writes i m building a cad package and need a d graphics library that can handle some rudimentry tasks such as hidden line removal shading animation etc can you please offer some recommendations i think apda has something called macwireframe which is a full wire frame and supposedly hidden line removal library i think it weighs in at but i ve been wrong on an order of magnitude before i spoke with the author of macwireframe earlier today the cost is but there are no license royalties his name is eric johnson in sacramento ca phone he doesn t have email very nice guy very knowledgeable about graphics seems like he may have a decent package it s an object pascal framework that supposedly has a fairly complete set of geometry creation classes i m going to check it out and see if it s got what i need for my cad package i also found another package d graphic tools by micro system options in seattle the number is also no email the package is strong at ray tracing i m not too sure about its geometry creation tools i also need to look into this package some more i also spoke with the author mark owens another nice guy that seems to know his business the price is no royalties bobc
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791 | comp.graphics | re please recommend d graphics library for mac in article qnm finn tr tamsun tamu edu brentb tamsun tamu edu brent writes tsa cellar org the silent assassin writes rgc bcstec ca boeing com robert g carpenter writes can you please offer some recommendations it s really not that hard to do there are books out there which explain everything and the basic d functions translation rotation shading and hidden line removal are pretty easy i wrote a program in a few weeks witht he help of a book and would be happy to give you my source i think he wanted to avoid reinventing the wheel yes i want to concentrate on other development issues i ve created graphics libraries before it s too time consuming life s too short also quickdraw has a lot of d functions built in and think pascal can access them and i would expect that think c could as well if you can find out how to use the quickdraw graphics library it would be an excellent choice since it has a lot of stuff and is built into the mac so should be fast just to clarify the d routines that are mentioned in various places on the mac are in a libray not the rom of the mac a few years ago before i knew anything about implementing graphics i came across a demo of the apple grafsys d library and it actually did a lot however it is quite limited in the sense that it s a low level d library your code still has to plot individual points draw each line etc ad nauseum it has nothing on gl for example where you can handle objects thanks for the clarification before posting my original request i had looked into the mac s d capabilities and dismissed them as low grade bobc
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792 | comp.graphics | re rumours about do in article apr mercury unt edu sean mcmains mcmains unt edu writes in article apr rchland ibm com ricardo hernandez muchado ricardo rchland vnet ibm com writes and cd i s cpu doesn t help much either i understand it is a supposedly a variation of a running at something like mhz with this speed you truly need sprites wow a i d be very interested to get my hands on one of these especially considering the fact that motorola has not yet released the which is supposedly the next in the x lineup d don t get too excited signetics not motorola gave the its number the if i understand rightly uses the instruction set and has an on chip serial port and dma it will run at up to mhz i m typing at a computer using a running at that rate so i know that it can do so so i seriously doubt the clock rate that ricardo rchland vnet ibm com claims james jones
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793 | comp.graphics | wanted multi page gif hi i am searching for packages that could handle multi page gif files are there any on some ftp servers i ll appreciate one which works on pc either on dos or windows but any package works on unix will be ok thanks in advance
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794 | comp.graphics | physics lab loses a number please i need the starting address pointer for the beginning of the color information rgb on vga mode h that s hex gee duh thanks soooo much hugs and kisses in advance john at uci e mail eapu orion oac uci edu
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795 | comp.graphics | articles on flocking hi all can someone point me towards some articles on boids or flocking algorithms also articles on particle animation formulas would be nice james kewageshig uucp james kewageshig canrem com n e t w o r k v i i i fidonet james kewageshig deluxe head of co xv hi this is a signature virus co canada remote systems toronto ontario
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796 | comp.graphics | xv under ms dos hi recently i found xv for ms dos in a subdirectory of gnu cc gnuish i use frequently xv on a sun spark station and i never had problems but when i start it on my computer with h option it display the help menu and when i start it with a gif file my hard disk turns or seconds and the prompt come back my computer is a little with copro mega rams tseng m running ms dos with himem sys and no emm sys i had the go exe too but no driver who run with it do somenone know the solution to run xv any help would be apprecied thanx in advance pascal perret perret eicn etna ch ecole d ing nieur ets not available at this time le locle suisse enjoy computer
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797 | comp.graphics | need polygon splitting algo the idea is to clip one polygon using another polygon not necessarily rectangular as a window my problem then is in finding out all the new vertices of the resulting subpolygons from the first one is this simply a matter of extending the usual algorithm whereby each of the edges of one polygon is checked against another polygon is there a simpler way comments welcome noel
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798 | comp.graphics | j c jensen s bitmap code greetings all according to a faq i read on july joshua c jensen posted an article on bitmap manipulation specifically scaling and perspective to the newsgroup rec games programmer article the article included source code in turbo pascal with inline assembly language i have been unable to find an archive for this newsgroup or a current email address for joshua c jensen if anyone has the above details or a copy of the code could they please let me know many thanks yours gratefully etc myles myles strous email myles strous lib monash edu au raytracing fan phone got the same urgent grasp of reality as a cardboard cut out proud to have him on the team archchancellor mustrum ridcully in reaper man by terry pratchett
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799 | comp.graphics | re hdf readers viewers i wrote g day all can anybody point me at a utility which will read convert crop whatnot display hdf image files i ve had a look at the hdf stuff under ncsa and it must take an award for odd directory structure strange storage approaches and minimalist documentation and it has since turned out that all the mirror sites i looked at were fooled by a restructuring at the original site zaphod ncsa uiuc edu and hence were in a mess that and a pointer to imconv should get me started ta muchly cheers markus markus buchhorn parallel computing research facility email markus octavia anu edu au australian national university canberra australia international australia phone fax
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