What is LCH?
I assume that this is LCHab since LAB is supported and discussed extensively. However, I have always had a nagging question about the role of LUV and LCHuv, practically speaking – just a curiosity really because CIELUV does exist. I.e., should we care about it?
Some links that might help stimulate this conversation:
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CIELUV - Wikipedia
“It is extensively used for applications such as computer graphics which deal with colored lights. Although additive mixtures of different colored lights will fall on a line in CIELUV’s uniform chromaticity diagram (dubbed the CIE 1976 UCS), such additive mixtures will not, contrary to popular belief, fall along a line in the CIELUV color space unless the mixtures are constant in lightness.” -
Colorimetry - Systems CIELAB and CIELUV
“The CIE recommends using the CIELUV color space for the characterization of color displays [and] using the CIELAB color space for the characterization of colored surfaces and dyes.” -
http://www.imagemagick.org/Usage/color_mods/
“Note that for very dark colors the ‘LCHuv’ can generate color values with discontinuities. This however should not happen for real images, only images generated directly in the cylindrical space.”