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Glossary

Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.

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CIE L*a*b*(also: CIELAB, Lab Color Space, CIE Lab)
A perceptually uniform colour space defined by the International Commission on Illumination (CIE) in 1976, where the numerical distance between two colour values approximates the perceived visual difference between those colours. The three dimensions are L* (lightness, from…
CIE LUV(also: CIELUV, CIE 1976 L*u*v*)
A perceptually uniform color space defined by the International Commission on Illumination (CIE) that separates color into luminance (L*) and two chromaticity coordinates (u* and v*). Unlike RGB, which is tied to display hardware and not perceptually uniform, equal distances in…
Color Adaptive Graphics(also: Colour Adaptive Graphics)
A technique for automatically adjusting the colours in graphical content so that objects maintain similar colour contrast relative to their reference background colours, regardless of the viewing context. Unlike recolouring approaches that focus on preserving the author's…
Color Gamut(also: Colour Gamut, Gamut)
The complete range of colours that can be represented or reproduced by a particular colour space, display device, or visual system. In the context of colour vision, a trichromat's gamut encompasses the full range of colours perceivable by typical human vision, while a…
Color Perception(also: Color Vision, Chromatic Vision)
Color perception is the ability to detect, distinguish, and identify colors. Impairments in color perception range from complete color blindness (achromatopsia) to partial deficiencies in distinguishing specific color ranges, such as red-green or blue-yellow color vision…
Color Space(also: Colour Space, Color Model)
A mathematical model that describes the range of colours that can be represented as numerical values, typically using three or more coordinates. Common colour spaces include RGB (red, green, blue), used in digital displays; CMYK (cyan, magenta, yellow, key/black), used in…

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