Left to right color distance methods:
CMC: based on the L*C*h color model. Takes RGB as input colors. CIE76: based on Lab color space. Takes RGB colors as input. (L2 norm on Lab parameters) CIE94: defined in the L*C*h* color space with differences in lightness, chroma and hue calculated from L*a*b* coordinates. CIE2000: use the same color space as CIE94 with corrections on perceptual uniformity issue. Euclidean: RGB colors.
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