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).
>
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