Meaning of X, Y, and Z
In this model, Y means luminance, Z is quasi-equal to blue stimulation, or the S cone response, and X is a mix (a linear combination) of cone response curves chosen to be nonnegative. Thus, XYZ may be confused with LMS cone responses. But in the CIE XYZ color space, the tristimulus values are not the L, M, and S responses of the human eye, even if X and Z are roughly red and blue. Rather, they may be thought of as 'derived' parameters from the long-, medium-, and short-wavelength cones.
Read more about this topic: CIE 1931 Color Space
Famous quotes containing the words meaning of:
“I begin, then, with some remarks about ‘the meaning of a word.’ I think many persons now see all or part of what I shall say: but not all do, and there is a tendency to forget, or to get it slightly wrong. In so far as I am merely flogging the converted, I apologize to them.”
—J.L. (John Langshaw)