CIE 1976 uniform chromaticity scale diagram

uniform chromaticity scale diagram produced by plotting in rectangular coordinates *v*' against *u*', quantities defined by the equations:

* u*' = 4 *X */ (*X *+ 15*Y* + 3*Z*) = 4*x* / (-2*x* + 12y + 3)

* v*' = 9 *Y */ (*X *+ 15*Y* + 3*Z*) = 9*y* / (-2*x* +12*y* + 3)

where 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

Equivalent term: "CIE 1976 UCS diagram"

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 2 pairs of coordinates are: *u*' = *u*; *v*' = 1,5 v.

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