If your LUT is built against sRGB, linear should be set to 0.04045 and gamma to 0.416667. The values you mention are very subtle, which could indicate 2 things :
* it is actually a linear to linear LUT, but you still need to increase the lightness for this particular image, * the LUT has been ill-made against non-normalized data. I would recommend to avoid LUTs done by "nice guys trying to help" you may find over the internet. Profiling colour transforms needs an evenly spaced sample of colour patches over the whole gamut, properly normalized in white balance and luminance range, under standard lighting, and will probably need to be optimized locally for skin tones or sky/earth tones (but hardy for both) to be homogenous enough. It requires some gear, serious skills and a fair amount of educated double-checking of the results to be done properly, and your average opensource fellow probably doesn't have the least idea of the complexity of the task he butchered over a Saturday afternoon. Good luck ! Aurélien. Le 13/10/2019 à 22:00, Christian a écrit : > Hello, > for me works: > > lin=0, gamma=0.90 > or > lin=0.4, gamma=0.46 > > (With basecurve turned OFF) > > Christian > > > Am 12.10.2019 um 22:29 schrieb Aurélien Pierre: >> 2. if it expects gamma encoding, enable the "unbreak color profile" >> module (mode set to "gamma", linear set to 0, gamma set to >> 0.45), move it in the pipe right before the LUT 3D module (Ctrl >> + Shift + drag and drop), then enable the LUT 3D module. >> 3. in case of a doubt, most LUT you will find on the internet are built >> against rec. 701 gamma 2.2 encoding (1/2.2 = 0.45, so set up unbreak >> colour profile gamma to 1/gamma). > > ___________________________________________________________________________ > > darktable developer mailing list > to unsubscribe send a mail to > darktable-dev+unsubscr...@lists.darktable.org > ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org