Constrained Least-Squares Regression in Color Spaces

Abstract

To characterize color values measured by color devices (e. g. , scanners, color copiers, and color cameras) in a deviceindependent fashion these values must be transformed to colorimetric tristimulus values. The measured RGB 3-vectors are not a linear transformation away from such colorimetric vectors, however, but still the best transformation between these two data sets, or between RGB values measured under different illuminants, can easily be determined.