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CIE standard illuminant A is intended to represent typical, domestic, tungsten-filament lighting. Its relative spectral power distribution is that of a Planckian radiator at a temperature of approximately 2856 K. CIE standard illuminant A should be used in all applications of colorimetry involving the use of incandescent lighting, unless there are specific reasons for using a different ...
To promote uniformity of practice in the evaluation of whiteness of surface colors, it is recommended that the formulæ for whiteness, W 2 or W 10, and for tint, T w,2 or T w,10, given below, be used for comparisons of the whiteness of samples evaluated for CIE standard illuminant D65.
Gamut of the CIE RGB primaries and location of primaries on the CIE 1931 xy chromaticity diagram In 1931, the International Commission on Illumination (CIE) published the CIE 1931 color spaces which define the relationship between the visible spectrum and human color vision. [1][2] The CIE color spaces are mathematical models that comprise a "standard observer", which is a static idealization ...
CIELAB color space Optimal colors (theoretical maximum chroma of surfaces) point cloud in CIE Lab, top view Optimal colors point cloud in CIE Lab, left view The CIE 1976 (L *, a *, b *) color space (CIELAB), showing only colors that fit within the sRGB gamut (and can therefore be displayed on a typical computer display).
CIE 1931 XYZ CIE 1931 XYZ was the first attempt to produce a color space based on measurements of human color perception and the basis for almost all other color spaces.
The International Commission on Illumination (CIE) calls their distance metric ΔE* (also inaccurately called dE*, dE, or "Delta E") where delta is a Greek letter often used to denote difference, and E stands for Empfindung; German for "sensation". Use of this term can be traced back to Hermann von Helmholtz and Ewald Hering. [7][8] Perceptual non-uniformities in the underlying CIELAB color ...
CIELUV In colorimetry, the CIE 1976 L*, u*, v* color space, commonly known by its abbreviation CIELUV, is a color space adopted by the International Commission on Illumination (CIE) in 1976, as a simple-to-compute transformation of the 1931 CIE XYZ color space, but which attempted perceptual uniformity.
The CIE photopic luminous efficiency function y(λ) or V(λ) is a standard function established by the Commission Internationale de l'Éclairage (CIE) and standardized in collaboration with the ISO, [1] and may be used to convert radiant energy into luminous (i.e., visible) energy.