Glossary
Searchable terminology from accessibility, web standards, and related fields.
14 results found in Color Accessibility.
- Anomalous Trichromat (Anomalous Trichromacy, Colour Anomaly)
- A person who has all three types of cone cells in the retina but one type has a shifted spectral sensitivity, causing altered colour perception that is less severe than dichromacy. Anomalous trichroma…
- CIE L*a*b* (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 diff…
- CIE LUV (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, whic…
- Color Adaptive Graphics (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 cont…
- Color Gamut (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 th…
- Color Perception (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 distinguishi…
- Color Space (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), us…
- Dichromat (Dichromacy, Dichromatic Vision)
- A person with colour vision based on only two types of functional cone cells in the retina instead of the typical three, resulting in a reduced ability to distinguish certain colours. Dichromats perce…
- Discrimination Ellipse (Discrimination Ellipsoid, MacAdam Ellipse)
- A region in a color space surrounding a given color within which other colors cannot be distinguished from it by an observer. In two dimensions this region forms an ellipse; in three-dimensional color…
- Farnsworth D-15 Test (D-15 Color Test, Farnsworth Dichotomous Test)
- The Farnsworth D-15 test is a clinical assessment used to evaluate color perception by asking a person to arrange 15 colored caps in order of hue. The pattern of errors reveals the type and severity o…
- Ishihara Test (Ishihara Colour Test, Ishihara Plates)
- A widely used clinical screening test for red-green colour vision deficiencies, consisting of a series of circular plates made up of coloured dots arranged in a mosaic pattern. Each plate contains a n…
- Monochromacy (Achromatopsia, Total Color Blindness)
- The rarest and most severe form of color vision deficiency, in which an individual has complete or near-complete absence of color perception, seeing the world only in shades of gray. Monochromacy occu…
- Simultaneous Color Contrast (Simultaneous Contrast)
- A perceptual phenomenon where the appearance of a colour is influenced by the colours surrounding it, causing the same colour to look different when placed against different backgrounds. For example, …
- Trichromat (Trichromacy, Trichromatic Vision)
- A person with typical colour vision based on three types of functional cone cells (L, M, and S cones) in the retina, each sensitive to different wavelengths of light corresponding roughly to long (red…