![]() ![]() Nibble) or fewer colors can be packed together into a single byte Pixel also occupies a single byte), pixel indices with 16 (4-bit, a Target architecture's display adapter hardware, so it is not a coincidence that those numbers areīe fit into a single 8- bit byte (and then a single indexed color The palette itself stores a limited number of distinct colors 4, 16 orĢ56 are the most common cases. system used a random-access frame buffer.Ī few earlier systems used 3-bit color, but typically treated the bits as independent red, green, and blue on/off bits rather than jointly as an index into a CLUT. ![]() 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). Technique to manage digital images' colors in a limited fashion A 2-bit indexed color image. ![]()
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