I would say "3.4.3.9. Color balance" is exactly what you are looking for. Is a (non graphical) version of the RGB tone curves described in Clarkvision's link. Best regards, Guillermo
On Mon, Nov 13, 2017 at 11:07 AM, Bernhard <[email protected]> wrote: > 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 >> >> >> ____________________________________________________________________________ >> darktable user mailing list >> to unsubscribe send a mail to >> [email protected] > > > -- > > regards > Bernhard > > http://www.bilddateien.de > > > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to [email protected] > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
