Cie 1931 Chromaticity Diagram. Plots the cie 1931 chromaticity diagram. We identified it from trustworthy source.
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1931 cie chromaticity diagram the inverted u shaped locus boundary represents monochromatic light or spectral coloursloosely rainbow colours.
That was one of the shortcomings that the 1960 and 1976 revisions sought to address. Thats why this system was further developed to the cielab system. Wavelengths shown in nm. The corresponding chromaticity diagram is shown in the above picture.