hi all,

i added a few minor updates to the color checker lut module and
related workflow:

1) the tonecurve has a new mode: adjust color automatic in RGB. this
pretty much turns the tone curve into a prophoto-rgb cure

2) darktable-chart uses this mode in a tonecurve when fitting luts to
pairs of images to complement the color lut

3) the color lut module has a new mode with absolute addressing (you
can dial in exactly the Lab values you want for output, not only
relative offsets to the source)

counterintuitively, using the rgb color mode in the tonecurve seems to
facilitate better separation into brightness and color saturation in
this setting. this means you can actually most of the time switch off
the color lut and the image still looks good for instance. or you can
switch off the tonecurve and do contrast in the local contrast module
for instance.

anyways, newly fitted styles for the fuji film modes, created from a
couple of shots i took of an it8 target can be found here (package
also contains csv files as created from darktable-chart and a Makefile
to re-create the dtstyle files):

https://jo.dreggn.org/darktable-fuji-styles.tar.xz

cheers,
 jo
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