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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.
A modification of "CIE 1931 XYZ" to display color differences more conveniently. The CIELUV space is useful for additive mixtures of lights, due to its linear addition properties (human hue perception does not respect light addition, however). [2]
The first is the simple difference between the two hue angles. The symbol for this expression of hue difference is Δ h a b {\displaystyle \Delta h_{ab}} in CIELAB and Δ h u v {\displaystyle \Delta h_{uv}} in CIELUV.
CIELAB and CIELUV can also be expressed in cylindrical form (CIELCh ab [13] and CIELCh uv, respectively), with the chromaticity components replaced by correlates of chroma and hue. Since the work on CIELAB and CIELUV, the CIE has been incorporating an increasing number of color appearance phenomena into their models and difference equations to ...
As most definitions of color difference are distances within a color space, the standard means of determining distances is the Euclidean distance.If one presently has an RGB (red, green, blue) tuple and wishes to find the color difference, computationally one of the easiest is to consider R, G, B linear dimensions defining the color space.
HSL (hue, saturation, lightness/luminance), also known as HLS or HSI (hue, saturation, intensity) is quite similar to HSV, with "lightness" replacing "brightness". The difference is that the brightness of a pure color is equal to the brightness of white, while the lightness of a pure color is equal to the lightness of a medium gray.
The "Preucil hue error" of an ink indicates the difference in the "hue circle" between its color and the hue of the corresponding idealized ink color. The grayness of an ink is m / M , where m and M are the minimum and maximum among the amounts of idealized cyan, magenta, and yellow in a density measurement.
Two important Adams chromatic valence spaces are CIELUV and Hunter Lab. Chromatic value/valence spaces are notable for incorporating the opponent process model and the empirically-determined 2 + 1 ⁄ 2 factor in the red/green vs. blue/yellow chromaticity components (such as in CIELAB ).