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Adobe Photoshop is a graphics editing program developed and published by Adobe Systems Incorporated.
Adobe's 2003 "Creative Suite" rebranding led to Adobe Photoshop 8's renaming to Adobe Photoshop CS. Thus, Adobe Photoshop CS5 is the 12th major release of Adobe Photoshop. The CS rebranding also resulted in Adobe offering numerous software packages containing multiple Adobe programs for a reduced price. There are two versions of Photoshop: Basic and Extended, with Extended having extra features available. Adobe Photoshop Extended is included in all of Adobe's Creative Suite offerings except Design Standard, which has the Basic version.

Contents [hide] 1 Development 1.1 Early history 2 Features 2.1 CS3 2.2 CS4 2.3 CS5 3 Version history 4 Release history 5 Language availabilities 6 Plugins 7 Cultural impact 8 See also 9 References 10 External links

[edit] Development

Further information: Adobe Photoshop release history

[edit] Early history

In 1987, Thomas Knoll, a PhD student at the University of Michigan, began writing a program on his Macintosh Plus to display grayscale images on a monochrome display. This program, called Display, caught the attention of his brother John Knoll, an Industrial Light & Magic employee, who recommended Thomas turn it into a fully-fledged image editing program. Thomas took a six month break from his studies in 1988 to collaborate with his brother on the program, which had been renamed ImagePro.^[1] Later that year, Thomas renamed his program Photoshop and worked out a short-term deal with scanner manufacturer Barneyscan to distribute copies of the program with a slide scanner; a "total of about 200 copies of Photoshop were shipped" this way.^[2]
During this time, John traveled to Silicon Valley and gave a demonstration of the program to engineers at Apple and Russell Brown, art director at Adobe. Both showings were successful, and Adobe decided to purchase the license to distribute in September 1988.^[1] While John worked on plug-ins in California, Thomas remained in Ann Arbor writing program code. Photoshop 1.0 was released in 1990 for Macintosh exclusively.^[3]

[edit] Features

Further information: Comparison of raster graphics editors#Features

Photoshop has ties with other Adobe software for media editing, animation, and authoring. The .PSD (Photoshop Document), Photoshop's native format, stores an image with support for most imaging options available in Photoshop. These include layers with masks, color spaces, ICC profiles, transparency, text, alpha channels and spot colors, clipping paths, and duotone settings. This is in contrast to many other file formats (e.g. .EPS or .GIF) that restrict content to provide streamlined, predictable functionality.
Photoshop's popularity means that the .PSD format is widely used, and it is supported to some extent by most competing software. The .PSD file format can be exported to and from Adobe Illustrator, Adobe Premiere Pro, and After Effects, to make professional standard DVDs and provide non-linear editing and special effects services, such as backgrounds, textures, and so on, for television, film, and the Web. Photoshop is a pixel-based image editor, unlike programs such as Macromedia FreeHand (now defunct), Adobe Illustrator, Inkscape or CorelDraw, which are vector-based image editors.
Photoshop uses color models RGB, lab, CMYK, grayscale, binary bitmap, and duotone. Photoshop has the ability to read and write raster and vector image formats such as .EPS, .PNG, .GIF, .JPEG, and Adobe Fireworks.

[edit] CS3

Smart Layers display the filter without altering the original image (here on Mac OS X)

New features propagating productivity include streamlined interface, improved Camera Raw, better control over print options, enhanced PDF support, and better management with Adobe Bridge. Editing tools new to CS3 are the Clone Source palette and nondestructive Smart Filters, and other features such as the brightness and contrast adjustment and Vanishing Point module were enhanced. The Black and White adjustment option improves control over manual grayscale conversions with a dialog box similar to that of Channel Mixer. Compositing is assisted with Photoshop's new Quick Selection and Refine Edge tools and improved image stitching technology.^[4]
CS3 Extended contains all features of CS3 plus tools for editing and importing some 3D graphics file formats, enhancing video, and comprehensive image analysis tools, utilizing MATLAB integration and DICOM file support.^[5]

[edit] CS4

Photoshop CS4 features a new 3D engine allowing painting directly on 3D models, wrapping 2D images around 3D shapes, converting gradient maps to 3D objects, adding depth to layers and text, getting print-quality output with the new ray-tracing rendering engine. It supports common 3D formats; the new Adjustment and Mask Panels; Content-aware scaling (seam carving^[6]); Fluid Canvas Rotation and File display options.^[7] On 30 April, Adobe released Photoshop CS4 Extended, which includes all the same features of Adobe Photoshop CS4 with the addition of capabilities for scientific imaging, 3D, and high end film and video users. The successor to Photoshop CS3, Photoshop CS4 is the first 64-bit Photoshop on consumer computers (only on Windows – the OS X version is still 32-bit only.)^[8]

[edit] CS5

Photoshop CS5 was launched on April 12, 2010.^[9] In a video posted on its official Facebook page, the development team revealed the new technologies under development, including three dimensional brushes and warping tools.^[10]
A version of Adobe Photoshop CS5 Extended was used for a Prerelease Beta. A large group of selected Photoshop users were invited to beta test in mid-February 2010.

[edit] Version history

Adobe Photoshop CS

Adobe Photoshop CS2

Adobe Photoshop CS3 Extended

Version	Platform	Codename	Release date	Significant changes
0.63	Macintosh		October 1988
1.0	Macintosh		February 1990
2.0	Macintosh	Fast Eddy	June 1991	Paths CMYK Color EPS Rasterization
2.5	Macintosh	Merlin	November 1992	16 bit per channel support
	Windows	Brimstone
	IRIX, Solaris		November 1993
3.0	Macintosh	Tiger Mountain	September 1994	Tabbed Palettes Layers
	Windows, IRIX, Solaris [11]		November 1994
4.0	Macintosh, Windows	Big Electric Cat	November 1996	Adjustment Layers Actions (macros) Multiple Undo (Amount set in preferences)
5.0	Macintosh, Windows	Strange Cargo	May 1998	Editable type (previously, type was rasterized as soon as it was added) History Palette with History Brush (Enhanced undo) Color Management Magnetic Lasso
5.5	Macintosh, Windows	Strange Cargo	February 1999	Bundled with ImageReady Save for Web Extract
6.0	Macintosh, Windows	Venus in Furs	September 2000	Vector Shapes Updated User Interface "Liquify" filter Layer styles/Blending Options dialog
7.0	Mac OS 'Classic'/Mac OS X, Windows	Liquid Sky	March 2002	Made text fully vector Healing Brush New painting engine
7.0.1	Mac OS 'Classic'/Mac OS X, Windows		August 2002	Camera RAW 1.x (optional plugin)
CS (8.0)	Mac OS X, Windows	Dark Matter	October 2003	Camera RAW 2.x Highly modified "Slice Tool" Shadow/Highlight command Match Color command Lens Blur filter Smart Guides Real-Time Histogram Detection and refusal to print scanned images of various banknotes[12] Macrovision copy protection based on Safecast DRM technology Scripting support for JavaScript and other languages Hierarchical layer groups 16 bit per channel layers, painting, and adjustments Support for files over 2 Gigabytes Documents up to 300,000 pixels in either dimension
CS2 (9.0)	Mac OS X, Windows 2000 / XP	Space Monkey	April 2005	Camera RAW 3.x Smart Objects Image Warp Spot healing brush Red-Eye tool Lens Correction filter Smart Sharpen Smart Guides Vanishing Point Better memory management on 64-bit PowerPC G5 Macintosh machines running Mac OS X 10.4 High dynamic range imaging (HDRI) support (32 bit per channel floating point) More smudging options, such as "Scattering" Modified layer selection, such as ability to select more than one layer.
CS3, CS3 Extended (10.0)	Universal Mac OS X, Windows XP SP2 or later	Red Pill	April 16, 2007	Native support for the Intel-based Macintosh platform and improved support for Windows Vista Revised user interface Feature additions to Adobe Camera RAW Quick Select tool Alterations to Curves, Vanishing Point, Channel Mixer, Brightness and Contrast, and the Print dialog Black-and-white conversion adjustment Auto Align and Auto Blend Smart (non-destructive) Filters Mobile device graphic optimization Improvements to cloning and healing More complete 32 bit / HDR support (layers, painting, more filters and adjustments) Faster launching
CS4, CS4 Extended (11.0)	Universal Mac OS X, Windows xp-sp2(sp3 recommended), Vista,7	Stonehenge	October 15, 2008[13]	Smoother panning and zooming and fluid canvas rotation OpenGL display acceleration in Photoshop Native support for 64-bit on Windows Vista x64 Adjustments panel Auto-blending of images Masks panel Improved Adobe Photoshop Lightroom workflow Content-aware scaling Better raw image processing Extended depth of field Dramatically enhanced color correction Auto-alignment of layers New file display options (tabbed document display and n-up views) New file management and workspaces with Adobe Bridge CS4
CS5, CS5 Extended (12.0)	Mac OS X v10, Windows XP-SP3,Vista,7	White Rabbit	April 30, 2010[14]	Content Aware Fill Puppet Warp Tool 64 bit for Macintosh Bristle Tips Mixer Brush Automatic Lens Correction Improved Camera RAW processing Camera RAW grain control Improved Ray Tracing (Extended) Repousse 3D extrusion tool (Extended) Image based lights (Extended)