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Appendix C: Chromaticity Reference
Appendices
C-6
The 1976 CIEĆUCS Chromaticity Diagram
The 1976 CIEĆUCS (Uniform Chromaticity Scale) diaĆ
gram, shown in FigureĂCĆ4, can be used to categorize
chromaticity measurements expressed as ui, vi values.
ui and vi are related to the x and y values of the 1931
CIE chromaticity diagram by the following equations:
uȀ+
4x
* 2x ) 12y ) 3
vȀ+
9y
* 2x ) 12y ) 3
This diagram is similar to the 1931 CIE chromaticity
diagram except for the following:
H Equal distances on the diagram represent approxiĆ
mately equal perceived color differences.
H The equal energy point is uiĂ=Ă0.210, viĂ=Ă0.473.
The primary disadvantage of the 1976 CIEĆUCS diaĆ
gram is that color mixtures cannot be determined easily
from the coordinates and intensities of their compoĆ
nents.
Appendix C: Chromaticity Reference
Appendices
C-6
The 1976 CIEĆUCS Chromaticity Diagram
The 1976 CIEĆUCS (Uniform Chromaticity Scale) diaĆ
gram, shown in FigureĂCĆ4, can be used to categorize
chromaticity measurements expressed as ui, vi values.
ui and vi are related to the x and y values of the 1931
CIE chromaticity diagram by the following equations:
uȀ+
4x
* 2x ) 12y ) 3
vȀ+
9y
* 2x ) 12y ) 3
This diagram is similar to the 1931 CIE chromaticity
diagram except for the following:
H Equal distances on the diagram represent approxiĆ
mately equal perceived color differences.
H The equal energy point is uiĂ=Ă0.210, viĂ=Ă0.473.
The primary disadvantage of the 1976 CIEĆUCS diaĆ
gram is that color mixtures cannot be determined easily
from the coordinates and intensities of their compoĆ
nents.