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CIEDE 2000 is not mathematically continuous. The discontinuity stems from calculating the mean hue Δ H ′ {\textstyle \Delta H^{\prime }} and the hue difference Δ h ′ {\textstyle \Delta h'} . The maximum discontinuity happens when the hues of two sample colors are about 180° apart, and is usually small relative to ΔE (less than 4%). [ 24 ]
Delta E: Thor 460 Delta 35 CCAFS LC-17A Pioneer 6: Interplanetary space research probe Heliocentric Success Probe continues to work as of late 2000. 24 1966-02-03 07:41 Delta C: Thor 445 Delta 36 CCAFS LC-17A ESSA-1: Weather Satellite LEO / SSO Success 25 1966-02-28 13:58 Delta E: Thor 461 Delta 37 CCAFS LC-17B ESSA-2: Weather Satellite LEO ...
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).
The XYZ primaries will have XYZ coordinates [1,0,0], [0,1,0], and [0,0,1] in XYZ space, so the columns of the inverse matrix above specify the XYZ primaries ( Cr, Cg and Cb) in RGB space. Dividing each column by its sum will give the coordinates of the XYZ primaries in rgb space which yields: Cr = {1.27496, -0.27777, 0.00280576}
CIELUV is an Adams chromatic valence color space and is an update of the CIE 1964 (U*, V*, W*) color space (CIEUVW). The differences include a slightly modified lightness scale and a modified uniform chromaticity scale, in which one of the coordinates, v′, is 1.5 times as large as v in its 1960 predecessor.
In two dimensions, the Levi-Civita symbol is defined by: = {+ (,) = (,) (,) = (,) = The values can be arranged into a 2 × 2 antisymmetric matrix: = (). Use of the two-dimensional symbol is common in condensed matter, and in certain specialized high-energy topics like supersymmetry [1] and twistor theory, [2] where it appears in the context of 2-spinors.
The chromaticity coefficients were chosen "on the basis of the spacing of the Munsell system. A lightness difference ΔW = 1 is assumed to correspond to a chromaticness difference √ ΔU 2 + ΔV 2 = 13 (approximately)." [4] With the coefficients thus selected, the color difference in CIEUVW is simply the Euclidean distance:
Illuminant E is an equal-energy radiator; it has a constant SPD inside the visible spectrum. It is useful as a theoretical reference; an illuminant that gives equal weight to all wavelengths. It also has equal CIE XYZ tristimulus values, thus its chromaticity coordinates are (x,y)=(1/3,1/3). This is by design; the XYZ color matching functions ...
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