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indexed color

In digital photography and imaging, indexed color is the term used to describe reduced color mapping of 8-bit or less. This is done to reduce images to their smallest size and these images are most commonly used on Web pages as they are small and quick to load. The 256 color palette is mapped for best results on the Internet, taking into account the differences between the Windows and Macintosh color palettes.

See "A Quick Guide to Digital Cameras" in the Quick Reference section of Webopedia.
See also Megapixel.net for news, reviews and a active community for digital camera and photography enthusiasts.

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