Definition: | the uniform-chromaticity-scale diagram produced by plotting in rectangular coordinates v′ against u′, quantities defined by the equations
X, Y, Z are the tristimulus values in the CIE 1931 or 1964 standard colorimetric systems, and x, y are the corresponding chromaticity coordinates of the colour stimulus considered
NOTE – This diagram is a modification of, and supersedes, the CIE 1960 UCS diagram in which v was plotted against u in rectangular coordinates. The relationships between the two pairs of coordinates are :
u′ = u; v′ = 1,5v.
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