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What is the “straight line rule” when referring to the CIE 1931 Chromaticity Diagram?

April 26, 2017chromaticity CIE diagram referring

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What is the “straight line rule” when referring to the CIE 1931 Chromaticity Diagram?

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It refers to the fact that the chromaticity of additive mixtures of two colors fall on the straight line between the chromaticities of those colors. The exact location along that line is proportional to the relative luminance to each of the two colors in the mixture.