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]
