Photoshop revolves around editing pixels, unlike Adobe Illustrator which uses vectors. When an image is rendered into Photoshop, it is compiled by millions of single-colored pixels. At its core, Photoshop works by manipulating each individual pixel. Pixels are manipulated according to whichever tool is being used. In the case of other tools, such as Blending Modes, the pixels are modulated according to their relations with other pixels. Individual colors are encoded by a 3-part scale: red values, green values, and blue values (RGB). Each value is measured on a scale of 0 to 255, with saturation increasing proportionate to number scale. A value of Red: 255 Green: 0 Blue: 0 will be rendered as pure red. All 3 values at 255 will be rendered as white, all values at 0 will be rendered as black, etc.
Photoshop can utilize the 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 Fireworks. It also has several native file formats:
* The .PSD (Photoshop Document) 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 .PSB (Large Document Format) format is a newer version of .PSD designed for files over 2 gigabytes.
* The .PDD (PhotoDeluxe Document) format is a version of .PSD that only supports the features found in the discontinued PhotoDeluxe software.
CS3
Photoshop CS3 is marketed with three main components of improvement over previous versions: "Work more productively, Edit with unrivaled power, and composite with breakthrough tools."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/Contrast adjustment and Vanishing Point module were enhanced. The Black and White adjustment option improves users 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.
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.
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