Mathematically right values in decomposing to LAB ?

[snibgo (Alan Gibson)]

@Elle

Example imagemagick commands can be found here: https://ninedegreesbelow.com/photography/lcms2-unbounded-mode.html - but that’s an old article, perhaps syntax has changed in the meantime.

Those ImageMagick commands should work fine for IM v6, or IM v7 if installed “with legacy commands”.

I recommend not using “composite” for anything. That is a very old tool, long deprecated. Instead, use “convert … -composite”, with the two input images in the opposite order. That way, a sequence of IM commands can be readily squished into a single command.