What is Image scanner?
[[File:Imagint scanners types 6.svg|thumb|Film scanner, for photographic slides]] In computing, an '''image scanner''' is a device used to transfer [[image]]s or [[text]] into a [[computer]]. There are special models for scanning [[Film negative|photo negative]]s, or to scan books. In the computer, the signal from the scanner is transferred to a [[Digital media|digital image]]. This image can then be edited, printed, etc. All scanners have special parts which are used to take a [[picture]] from an object. Charge-coupled device or Contact Image Sensor parts take the light from the object and change it into a [[digital signal]]. The digital signal is then transferred to the [[computer memory]] or is read in the scanner's [[processor]]. With some [[software]] it can be changed to a compressed digital image, like [[JPEG]] or PNG. Text printed or written by hand can be changed to [[ASCII]] code by an [[Optical character recognition|OCR]] program. == Types == The main types of scanner *''Desktop scanner'' (flatbed scanner). This is probably the most popular type. An object to be scanned (picture, image, text sheet) is put on the glass. Under the glass, there is a moving Image Sensor. *''Hand scanner''. The device is moved on the paper by hand. It was popular during the 1990s. *''Rotary scanner'' (drum scanner) used for fast scanning large numbers of sheets of paper. *''Smartphone scanner'' scans a document by taking a photo with the smartphone's camera.<ref>{{Cite web|url=https://play.google.com/store/apps/details?id=com.bpmobile.iscanner.free|title=Scanner App – Scan documents to PDF for free - Apps on Google Play|website=Google Play|language=en|access-date=2020-07-08}}</ref> == Producers == * Canon * HP * Lexmark * Mustek * Plustek * Other == References == <references /> ==Related pages== * [[Digital camera]] == Other websites == * [http://www.scantips.com/ Scanning tips] * [http://www.pgacon.com/tips_on_scanning.htm More tips on scanning] {{Webarchive|url=https://web.archive.org/web/20071014012237/http://ww