![]() SuperPaint used a shift-register frame buffer, while the Kajiya et al. These supported a palette of 256 RGB colors. This technique is sometimes referred as pseudocolor or indirect color, as colors are addressed indirectly.Įarly graphics display systems that used 8-bit indexed color with frame buffers and color lookup tables include Shoup's SuperPaint (1973) and the video frame buffer described in 1975 by Kajiya, Sutherland, and Cheadle. Each image pixel does not contain the full specification of its color, but only its index into the palette. Every element in the array represents a color, indexed by its position within the array. ![]() ![]() When an image is encoded in this way, color information is not directly carried by the image pixel data, but is stored in a separate piece of data called a color lookup table (CLUT) or palette: an array of color specifications. It is a form of vector quantization compression. In computing, indexed color is a technique to manage digital images' colors in a limited fashion, in order to save computer memory and file storage, while speeding up display refresh and file transfers. ![]() The color of each pixel is represented by a number each number (the index) corresponds to a color in the color table (the palette).
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