Definition
Chromaticity coordinates x, y, and z are calculated from CIE tristimulus values X, Y, and Z thus:
If the chromaticity coordinates and one of the tristimulus values (e.g., Y) are known, then it is possible to compute tristimulus values thus:
Chromaticity Coordinates
The use of chromaticity coordinates is an alternative, and often more useful, representation to the use of tristimulus values. The tristimulus values X, Y, and Z of a stimulus are the amounts of three primary lights that on average an observer would use to match the stimulus and as such form a specification of the stimulus. If the Y tristimulus value is calculated on an absolute basis, then it represents the luminance of the color stimulus, in candelas per square meter, for example [1]. When relative tristimulus values are calculated so that Y= 100 for a...
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References
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Westland, S. (2016). CIE Chromaticity Coordinates (xyY). In: Luo, M.R. (eds) Encyclopedia of Color Science and Technology. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-8071-7_1
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