Adobe Photoshop is a raster graphics editor developed and distributed by Adobe Inc. for windows and Mac OS. It was originally created by Thomas and John Knoll in 1988. Since then, the software has not only become the industry standard of raster graphics editing, but also the industry standard of the whole digital art. As a result, the name of the software has become a generic trademark, resulting in the software being used as a verb (e.g., "Photoshop on pictures," "Photoshopping," and "Photoshop competition"), although Adobe does not encourage this. Photoshop can edit and synthesize raster images in multiple layers, and supports mask, alpha synthesis and various color models, including RGB, CMYK, CIELAB, spot color and two tone. Photoshop uses its own PSD and PSB file formats to support these features. In addition to raster graphics, the software has limited ability to edit or render text and vector graphics (especially through clipping paths), as well as 3D graphics and video. Its feature set can be extended through plug-ins. Programs developed and distributed independently of Photoshop, in which they run and provide new or enhanced features.

Photoshop's naming scheme was originally based on the version number. However, in October 2002 (after the introduction of the Creative Suite brand), each new version of Photoshop was marked with "CS" and a number; for example, the eighth major version of Photoshop was Photoshop CS, and the ninth major version was Photoshop CS2. Photoshop CS3 to CS6 are also available in two different versions: standard and extended. With the introduction of the creative cloud brand in June 2013 (and the change of the "CS" suffix to "CC"), Photoshop's licensing scheme has been changed to a software as a service leasing model. Historically, Photoshop has been bundled with other software, such as Adobe ImageReady, Adobe fireworks, Adobe bridge, Adobe device central and adobe camera raw.

In addition to Photoshop, Adobe has also developed and released Photoshop Elements, Photoshop Lightroom, Photoshop express, Photoshop fix, Photoshop sketch and Photoshop mix. Adobe also plans to release a full version of Photoshop for the iPad in 2019. They are collectively referred to as "Adobe e Photoshop family".

The default file extension for Photoshop files is. PSD, which stands for Photoshop documents. The images stored in the PSD file support most of the imaging options available in Photoshop. It includes layers with matte, transparency, text, alpha channels and spot colors, clipping paths and two tone settings. This is in stark contrast to many other file formats, such as. JPG or. GIF, which restrict content to provide simplified, predictable functionality. PSD files have a maximum height and width of 30000 pixels and a length limit of 2 GB.

Photoshop files sometimes have a file extension of. PSB, which stands for "Photoshop big" (also known as "big document format"). The PSB file extends the PSD file format, increasing the maximum height and width to 300000 pixels, and the length limit to about 4 AI bytes. Size limits are obviously chosen by Adobe at will, not based on computer arithmetic constraints (it's not a power of 30000 to two), but to simplify software testing. PSD and PSB formats are recorded.

Due to the popularity of Photoshop, PSD files are widely used and supported in most competitive software. You can export. PSD file formats to and from other Adobe applications, such as adobe illustrator, Adobe Premiere Pro, and after effects.

Photoshop CC 2019 was released on October 15, 2018. From Photoshop CC 2019 (version 20.0), the 32-bit version of windows is no longer supported. This release introduces new features, including a new tool called the framing tool, which creates placeholder frames for images. It also adds a new content aware fill, multiple Undo mode, and auto commit to prevent the panel from accidentally moving and locking the workspace. Added real-time blend mode preview to scroll through the different blend mode options in the layers panel faster. Other new functions include color wheel, which can be transformed in proportion without shift key, space allocation like in illustrator, ability to view longer layer names, match fonts with Japanese fonts, flip document view, zoom UI to fonts, hide reference points by default, new synthesis engine, which provides a more modern synthesis architecture and is easier to optimize on all platforms 。