Following up my previous post, where I introduced my new log profile correction, I present to you another mode for color-grading in darktable : the ASC CDL (https://en.wikipedia.org/wiki/ASC_CDL).
Triying to correct the picture showed in [Playraw] Presolana (was: Salvaging a raw), I had a hard time with the current lift/gamma/gain module, which works in gamma-corrected sRGB mode and is difficult to work with, and shows over-saturation in shadows:
The new module follow the American Society of Cinematographers Color Decision List standard and works inlinear (= non gamma-corrected) ProPhoto RGB space:
In these 2 examples, I tried to match as closely as possible the two settings. However, you see the lift/gamma/gain mode oversaturates the dark greens and produces a loss of local contrast in highlights.
It was also easier to set-up the offset/power/slope version (less trials and errors). This can be a good way to adjust the contrast as well, after having recovered the dynamic range with the log profile (https://discuss.pixls.us/t/solving-dynamic-range-problems-in-a-linear-way/)
NB : I was using the dehaze module as well, so the resaturation + additionnal contrast comes from there