Adobe Lightroom
Adobe Lightroom (officially Adobe Photoshop Lightroom) is a piece of image organization and image processing software developed by Adobe Inc. as part of the Creative Cloud subscription family. It is supported on Windows, macOS, iOS, Android, and tvOS (Apple TV). Its primary uses include importing, saving, viewing, organizing, tagging, editing, and sharing large numbers of digital images. Lightroom's editing functions include white balance, presence, tone, tone curve, HSL, color grading, detail, lens corrections, and calibration manipulation, as well as transformation, spot removal, red eye correction, graduated filters, radial filters, and adjustment brushing. The name of the software is based on darkrooms used for processing light-sensitive photographic materials.

Overview 
Lightroom is a non-destructive editing software that keeps the original image separate from any in-program edits, saving the edited image as a new file. While Photoshop includes doctoring functions like adding, removing or altering the appearance of individual image items, rendering text or 3D objects on images, or modifying individual video frames, Lightroom is a library and development software. Lightroom can store and organize photos once imported into the platform database, and is currently compatible with TIFF, JPEG, PSD (Photoshop), PNG, CMYK (edited in RGB color space) and raw image formats.

Initially, Adobe Lightroom was only available on desktop operating systems. However, in 2017, it was expanded to support mobile operating systems with the release of Lightroom Mobile. Later in 2017, Adobe released a brand new variant of Lightroom called Lightroom CC to be more cohesive with their mobile software. The existing version of Lightroom was renamed Lightroom Classic CC, and Lightroom Mobile was renamed to Lightroom CC to have the same name as this new desktop version. While similar in some ways, all three Lightroom variations have significant differences in how they store images and interact with Adobe's cloud storage offering and in feature parity. Lightroom CC stores all uploaded photos and raw files on a cloud server, while Lightroom Classic CC stores files locally and has a more comprehensive set of features. Both CC platforms and Lightroom Mobile also allow users to create, upload, and export Lightroom presets, a batch copy of an image's in-program edits.

There is currently a large market for Lightroom presets as a tool for both mobile and digital photographers looking for an easy way to apply a stylized look to their images.

Lightroom Classic CC and Lightroom CC feature the following workflow steps:

Library 

 Similar in concept to the 'Organizer' in Adobe Photoshop Elements and other image organizers, this module allows users to browse the directory structure of their catalog, browse and create Collections, access Publish Services, import and export images, edit Keywords, organize images by their metadata, and flag, rate, tag, and color code images.

Develop 

 Supports non-destructive editing of images in batch form. This module is more for retouching and manipulations, such as enhancing and improving digital photographs by changing color balance, improving tone, sharpening, reducing noise, cropping, straightening, and converting to black-and-white. Lightroom cannot create or edit non-photographic images, such as drawings, symbols, line arts or diagrams or maps, or render text or 3D objects. It has very limited photo doctoring features, including spot removal, brush adjustments, radial and graduated filters, and red eye removal. Another often used feature in the Develop module is the ability to synchronize edits from one photo to a selection.
 Upon download, Lightroom provides users with several standard presets for color correction and effects, and supports sharing custom presets online. There is currently a large market for both desktop and mobile image manipulation packages. Photographers and creators with large followings on Instagram and Facebook sell Lightroom Presets to their audience, marketing to their ease and versatility after download. Presets are attached to .XMP and .LRTEMPLATE files that can be imported to Lightroom via the presets pane and include all adjustment settings from the originally doctored photo. Presets are around 4 Kilobytes in size and can range in price from free to upwards of $200.

Map 

 Added in Lightroom 4, this module facilitates geographically organizing photos based on embedded or manually added geolocation data (since end of 2018 this is no longer supported for up to Lightroom CC 2015.x / Lightroom 6.x).

Slideshow 

 This module creates slideshows from any number of photos, to which music or a background can be added.

Print 

 Allows users to print images and adjusts printing parameters such as layout and orientation.

Web 

 Allows website owners or editors to create simple or sophisticated HTML5 web galleries from their uploaded images. This module has several templates available to users that create layout suggestions. The design and HTML can be exported locally to the device or directly to a site's server.

History 
In 1999, veteran Photoshop developer Mark Hamburg began a new project, code-named Shadowland (a reference to the 1988 KD Lang music album of same name). Hamburg contacted Andrei Herasimchuk, former interface designer for the Adobe Creative Suite, to start the project. It was an intentional departure from many of Adobe's established conventions. Forty percent of Photoshop Lightroom is written in the scripting language Lua. In 2002, Hamburg left the Photoshop project and in fall of the same year he sent a first experimental software sample, name PixelToy, to his former teammate Jeff Schewe for review; in 2003, Hamburg presented Schewe a first version of Shadowland in a very early UI version.  After a few years of research by Hamburg, Herasimchuk, Sandy Alves (the former interface designer on the Photoshop team), and Grace Kim (a product researcher at Adobe), the Shadowland project accelerated around 2004. However, Herasimchuk chose to leave Adobe Systems at that time to start a Silicon Valley design company. Hamburg then chose Phil Clevenger, a former associate of Kai Krause, to design a new look for the application.

Photoshop Lightroom's developers work mostly in Minnesota, comprising the team that had already created the program Adobe ImageReady. Troy Gaul, Melissa Gaul, and the rest of their crew (reportedly known as the "Minnesota Phats"), with Hamburg, developed the architecture behind the application. George Jardine was the product manager.

Beta development 
On January 9, 2006, an early version of Photoshop Lightroom, formerly named only Lightroom, was released to the public as a Macintosh-only public beta, on the Adobe Labs website. This was the first Adobe product released to the general public for feedback during its development. This method was later used in developing Adobe Photoshop CS3.

On June 26, 2006, Adobe announced that it had acquired the technology of Pixmantec, developers of the Rawshooter image processing software.

Further beta releases followed. Notable releases included Beta 3 on July 18, 2006, which added support for Microsoft Windows systems. On September 25, 2006, Beta 4 was released, which saw the program merged into the Photoshop product range, followed by a minor update on October 19, which was released as Beta 4.1.

Version 1.0 
On January 29, 2007, Adobe announced that Lightroom would ship on February 19, 2007, list priced at $299 US, £199 UK.

Lightroom v1.x is not updated when an upgrade to v2 is installed; a new serial number is needed.

Version 2.0 
Adobe Photoshop Lightroom 2.0 Beta was advertised in official emails from Adobe in April 2008.

The official release of Lightroom v2 was on July 29, 2008, along with the release of Adobe Camera Raw v4.5 and DNG Converter 4.5. Adobe Camera Raw allows importing the proprietary raw data images of various camera manufacturers.

Version 3.0 

Adobe Photoshop Lightroom 3.0 beta was released on October 22, 2009.

Although not included in any beta release, version 3 also contains built-in lens correction and perspective control.

Version 4.0 
Adobe Photoshop Lightroom 4.0 was officially released on March 5, 2012 after being available in beta format since January 10, 2012. It dropped support for Windows XP.

Version 5.0 
Adobe Photoshop Lightroom 5.0 was officially released on June 9, 2013 after being available in beta format since April 15, 2013. The program needs Mac OS X 10.7 or later, or Windows 7 or 8.

An update to Version 5, 5.4 allows syncing a collection to Lightroom Mobile App released for iPad on April 8, 2014.

Version 6.0 
Adobe Photoshop Lightroom CC 2015 (version 6.0) was officially released on April 21, 2015. It is the first release of Lightroom to only support 64-bit operating systems.

Lightroom 6.7 increased the minimum version of macOS required to OS X 10.10.

Apple TV
On July 26, 2016, Adobe launched Lightroom on Apple TV, a means of displaying photographs on a large screen using Apple's network appliance and entertainment device.

Development branches 
Adobe Photoshop Lightroom Classic CC (unofficially: version 7.0) was officially released on October 18, 2017. It is the first version of Lightroom that is not available with a perpetual license (one-time purchase price); instead, it must be licensed through a monthly subscription model, with the fee initially set at US$9.99/month. Once the user stops paying the monthly fee, the program will be limited to viewing existing catalogs, without the ability to apply further changes to images.

Adobe Lightroom CC is the new online cloud-based version of Adobe's Lightroom application and can be installed alongside Lightroom Classic CC. It is included in the same US$9.99/month photography plan, but has limited editing features in comparison to Lightroom Classic CC. It can be installed on desktops, laptops, iPad and mobile. Lightroom CC has the ability to sync developed photos easily between a laptop, iPad and mobile devices, which is the major difference between both applications. Its user interface is also more similar to that of Adobe's mobile version of the applications.

See also 
 Comparison of raster graphics editors

References

External links 

 
 
 Current versions
 Talk given by Troy Gaul, Adobe's lead Lightroom programmer in 2009 at the C4 conference, covering Lightroom's history, code and architecture up to version 2.0

Lightroom
Photo software
Image organizers
Raster graphics editors
Lua (programming language) software
2007 software
Raw image processing software