you might use "3.4.3.8. Color zones"
http://www.darktable.org/usermanual/ch03s04s03.html.php
Manuel Coenen schrieb am 13.11.2017 um 14:30:
Hi,
I have been struggling and failing now for a while to achieve the
following: I want to modify only red (or green or blue) colors using the
tone curve as I would do this e.g. in GIMP, Photoshop or RawTherapee using
the respective Curves Tools only set to the appropriate channel.
Using the tone curve in manual mode in the upper right part of the a
channel might work but as the histogram only covers a very narrow part at
the center there is not enough fine grained control for my purpose. So I
assume I need to set some kind of mask and use the L channel.
I do not question the decision of using LAB color space for processing here
(I get the pros I think) I only want to know what I have to set the
parametric mask to to only modify e.g. red colors as I would with a RGB
curve tool.
If you want to know what exactly I am trying to do, look at
http://www.clarkvision.com/articles/astrophotography.image.processing2/
Figures 4a and 4b
Best regards
Manuel
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--
regards
Bernhard
http://www.bilddateien.de
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