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Gamut of the CIE RGB primaries and location of primaries on the CIE 1931 xy chromaticity diagram.The CIE 1931 RGB color matching functions normalized to equal areas under the curves. Multiplying the red and green curves by 72.0962 and 1.3791 respectively yields the actual color matching functions. The color matching functions are proportional to the intensities of primaries needed to match the monochromatic test color at the wavelength shown on the horizontal scale.CIE RGB color cube (image encoded with an ICC profile)
The CIE 1931 color spaces are the first defined quantitative links between distributions of wavelengths in the electromagnetic visible spectrum, and physiologically perceived colors in human color vision. The mathematical relationships that define these color spaces are essential tools for color management, important when dealing with color inks, illuminated displays, and recording devices such as digital cameras. The system was designed in 1931 by the "Commission Internationale de l'éclairage", known in English as the International Commission on Illumination.
The CIE 1931 RGB color space and CIE 1931 XYZ color space were created by the International Commission on Illumination (CIE) in 1931.[1][2] They resulted from a series of experiments done in the late 1920s by William David Wright using ten observers[3] and John Guild using seven observers.[4] The experimental results were combined into the specification of the CIE RGB color space, from which the CIE XYZ color space was derived.
The CIE 1931 color spaces are still widely used, as is the 1976 CIELUV color space.
^CIE (1932). Commission internationale de l'Eclairage proceedings, 1931. Cambridge: Cambridge University Press.
^Smith, Thomas; Guild, John (1931–32). "The C.I.E. colorimetric standards and their use". Transactions of the Optical Society. 33 (3): 73–134. Bibcode:1931TrOS...33...73S. doi:10.1088/1475-4878/33/3/301.
^Wright, William David (1928). "A re-determination of the trichromatic coefficients of the spectral colors". Transactions of the Optical Society. 30 (4): 141–164. doi:10.1088/1475-4878/30/4/301.
^Guild, J. (1932). "The colorimetric properties of the spectrum". Philosophical Transactions of the Royal Society of London. Series A, Containing Papers of a Mathematical or Physical Character. 230 (681–693): 149–187. Bibcode:1932RSPTA.230..149G. doi:10.1098/rsta.1932.0005. JSTOR 91229. The trichromatic coefficients for [Wright's] ten observers agreed so closely with those of the seven observers examined at the National Physical Laboratory as to indicate that both groups must give results approximating more closely to 'normal' than might have been expected from the size of either group
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International Commission on Illumination (CIE) in 1976, as a simple-to-compute transformation of the 1931CIE XYZ colorspace, but which attempted perceptual uniformity...
value is 563/256, or 2.19921875. In coverage of the CIE1931colorspace the Adobe RGB (1998) colorspace covers 52.1%. The chromaticities of the primary...
test color (PC, in this example) in terms of the primaries. This would be the precursor to the color matching functions of the CIE1931colorspace, whose...
(i.e., visible) energy. It also forms the central color matching function in the CIE1931colorspace. There are two luminous efficiency functions in common...
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attributes of perceived color relating to chromatic intensity. As defined formally by the International Commission on Illumination (CIE) they respectively...
CIE 1931 colorspace, one of the first mathematically defined colorspaces, created by the International Commission on Illumination (CIE) in 1931 Clasificación...
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to that of a spectral color, although one can get close, especially for the longer wavelengths, where the CIE1931colorspace chromaticity diagram has...
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