Adobe provides ample documentation about Photoshop's color modes. There are a variety of possibilities for color mode in Photoshop, See Factors below. File Header: The file header contains the basic properties of the image including height and width of the image, depth, color mode, number of channels, and signatures.The traditional file structure for PSD and PSB files consists of five major parts: For interoperability with other Macintosh applications, however, some information is duplicated in resources stored in the resource fork of the file.' According to Adobe's specifications, 'For cross-platform compatibility, all information needed by Photoshop is stored in the data fork. Photoshop file formats differ slightly depending on the operating system. The Adobe Large Document Format supports documents up to 300,000 pixels in any dimension and file sizes can range up to 4 exabytes (over 4.2 billion GB). The PSB (Adobe Photoshop Large Document Format) file format is almost identical to the PSD file, however, it allows for a considerably bigger file size. The PSD file format has a maximum height and width of 30,000 pixels and a length limit of two gigabytes. Along with Adobe's Large Document Format (PSB), it is Adobe Photoshop's native file format, 'that supports all Photoshop features,' as stated by Adobe Photoshop's online user guide. PSD (Adobe Photoshop Document) files are raster image files, which include support for image manipulation such as layers, masks, transparency, text, alpha channels, clipping path, additional color settings, and a variety of other Photoshop-specific elements. The Adobe Photoshop Family includes the two native formats for Adobe Photoshop, PSD (Adobe Photoshop Document) and PSB (Adobe Photoshop Large Document), which support all Photoshop features as stated by Adobe Photoshop's online user guide.

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