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The three tristimulus values, XYZ, form a color coordinate system.
In order to represent individual colors in a descriptive manner, the standardized red and green color fractions x and y are projected into a planar coordinate system (often called "shoe sole" for its shape).
This xy representation is independent of the brightness of the coloring and produces all object colors that can be produced. Moreover, it allows the wavelengths of the colors triggering a monochromatic color stimulus to be determined. The so-called line of purples, which represents the violet hues between red and blue, is situated in the lower region.
However, one deficit of the xy chromaticity values is that color distances in this coordinate system do not correspond to differences in color as they are perceived physiologically. |
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