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CIEUVW
CIE 1964 (U, V, W*) Colour Space, also known as CIEUVW is based on the CIE 1960 Uniform Colour Space.
\(U^*=13W^*(u-u_0)\)
\(V^*=13W*(v-v_0)\)
Where (\(u_0,v_0\)) is the white point snd Y is the luminous Tristimulus value of the object.
The asterisks in the exponent indicates that the variable represents a more perceptually uniform colour space than its predecessor.
Wyszecki invented the UVW colour space in order to be able to calculate colour differences without having to hold the luminance constant.
He defined a Lightness index W by simplifying the expressions suggested earlier by Ladd and Pinney. The chromaticity components U and V* are defined such that the White Point maps to the origin, as in Adams chromatic valence colour spaces