Hola Marti

> No... L should control the luma, and leave hue alone. Your
> formula seems ok.

 don't think this problem come lcms or profile.
my main problem is that for some light color , darking it of 20% give a
small difference of lightness and other light colors it gives a very darker
color, that's why I wonder if the problem doesn't come from the formula.

in my example I use lab 85/0/114   85/-85/-120     and lab profile to SRGB
profile.

the problem may also come an out of gamut color.....





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