Abstract
The problem of choice of tristimulus color coordinates which uniquely depend on chromophore concentration in an investigated material has been considered. A theoretical study shows that there are no simple analytical formulas for such dependences, and the majority of tristimulus coordinates of various color spaces: RGB, CIE (XYZ), CIE (L*a*b*), CIE (L*C*H*), HSB, and CMYK poorly correlate with the concentration of molecules responsible for color. However, analysis of published papers on this subject provides abundant evidence showing that at least one tristimulus coordinate of the CIE (L*a*b*) color space, specifically L* (lightness), is related to chromophore concentration C by a simple, steadily descending exponential function. The empirical formula L* = L*(C) can be successfully applied for instrumental treatment of experimental colorimetric data for the determination of chromophore concentrations.
Published Version
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