Dear Johannes,
Am 08.09.2017 um 15:00 schrieb johannes hanika:
awesome, thanks! the hope with the clustered fit would be that the lut
is generally smooth enough to be represented with lower sampling
density. did you look at the max delta E error (distance in Lab colour
space)? darktable-chart outputs it somewhere in the process. if it
drops below 2.0 it should not be visible (2 is the just noticeable
difference).
I do not remember the exact figures, but max delta E was almost always
significantly larger than 2. For comparison one can apply the darktable
style and the G'MIC film emulation filter to a JPEG file and compare the
results. I did so for just a few styles. In a direct comparison one
can easily see small differences. Nevertheless the darktable styles
capture the general color tone of the G'MIC film emulation filters quite
well.
Heiko
--
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