Technique to manage digital images' colors in a limited fashion
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A 2-bit indexed color image. The color of each pixel is represented by a number; each number (the index) corresponds to a color in the color table (the palette).
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. It is a form of vector quantization compression.
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. Every element in the array represents a color, indexed by its position within the array. Each image pixel does not contain the full specification of its color, but only its index into the palette. This technique is sometimes referred as pseudocolor[1] or indirect color,[2] as colors are addressed indirectly.
^Charles A. Poynton (2003). Digital Video and HDTV: Algorithms and Interfaces. Morgan Kaufmann. ISBN 1-55860-792-7.
^Computer Graphics, Prof. R. Eckert, Lect. #5, February 2001, Binghamton U., N.Y.
In computing, indexedcolor is a technique to manage digital images' colors in a limited fashion, in order to save computer memory and file storage, while...
In astronomy, the colorindex is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature...
A color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison...
bits, plus one unused bit (or used for a mask channel or to switch to indexedcolor); this allows 32,768 colors to be represented. However, an alternate...
during the run of a program Indexedcolor, in computer imagery Indexed Sequential Access Method (ISAM), used for indexing data for fast retrieval Lookup...
the pixel bits themselves or provided by a separate color look-up table (CLUT) if indexedcolor graphic modes are used. A CLUT is a specialized RAM that...
Second, usual color repertories used for display systems that employ indexedcolor techniques. And finally, specific manufacturers' color palettes implemented...
(1, 4, or 8) which is an index of a single color described by this table. The purpose of the color palette in indexedcolor bitmaps is to inform the application...
for color type 3 (indexedcolor). It is optional for color types two and six (truecolor and truecolor with alpha) and it must not appear for color types...
Color (American English) or colour (Commonwealth English) is the visual perception based on the electromagnetic spectrum. Though color is not an inherent...
methods: a color may be specified as an RGB triplet, in hexadecimal format (a hex triplet) or according to its common English name in some cases. A color tool...
region a given point falls in; in practice, indexed palettes are so small that these are usually overkill. Color quantization is frequently combined with...
High color graphics is a method of storing image information in a computer's memory such that each pixel is represented by two bytes. Usually the color is...
colors by shade List of color palettes List of Crayola crayon colors List of RAL colours List of X11 color names Index of color-related articles List of...
the minimum radius, the maximum radius. Binary images are produced from color images by segmentation. Segmentation is the process of assigning each pixel...
colour index numbers are 5-digit numbers grouped into numerical ranges according to the chemical structure. 1st (-) 2nd (1956) 3rd (1971) Color chart List...
the (legacy) version 4, an emulated 12-bit color mode example code ("ex12bit.c"), using 8-bit indexedcolor in VGA/SVGA. It used two pixels for each emulated...
Color blindness or color vision deficiency (CVD) is the decreased ability to see color or differences in color. The severity of color blindness ranges...
features such as the STE 4096-color palette. "[" and "]" hotkeys could step through the indexed palette, turning indexed-pixel-painting into a fast two-handed...
color image has no defined colorspace, or if the grayscale image is not intended to have the same human-perceived achromatic intensity as the color image...
Color temperature is a parameter describing the color of a visible light source by comparing it to the color of light emitted by an idealized opaque, non-reflective...
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