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Glenn, Lab is definitely not


Lab is definitely not the best choice. On the other side, we need some widely recognized color space for image storage/exchange. From this point, Lab is better choice (RGB and CMYK are imperfect, other color spaces are uncommon). L axis of Lab is good enough.

AFAIK, there is no 'digitizable' perceptually uniform color spaces. Munsell scale is good, but there is no easy way to calculate (perceptually) intermediate color values.

-- Alex Tutubalin @LibRaw LLC