chromaticity diagram

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Related to colour triangle: Maxwell triangle

chromaticity diagram

[‚krō·mə′tis·əd·ē dī·ə‚gram]
(optics)
A triangular graph for specifying colors, whose ordinate is the y chromaticity coordinate and whose abscissa is the x chromaticity coordinate; the apexes of the triangle represent primary colors. Also known as chromatic diagram.