Definition: | the uniform-chromaticity-scale diagram produced by plotting in rectangular coordinates v' against u', quantities defined by the equations (1) :
X
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'= 1,5 v.
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