The channel mixer in dt, as it is in Raw Therapee and GIMP, is a GUI. What you need to understand is mixing. Here's a video that has the use of channel mixer at the beginning of the editing. https://www.youtube.com/watch?v=bUP1TxVeL44
Here's a guide that I developed to help me understand what happens: *Red channel*: Increase green slider, which increases red where there is green and therefore *the hue shifts to* *yellow* until you get to blue, and then *the hue shifts to* *magenta*. Decrease green slider, which decreases red where there is yellow and therefore *increases* *green*. Increase blue slider, which increases red where there is blue and therefore *the hue shifts to* *magenta* until you get to green, and then *the hue shifts to* *yellow*. Decrease blue slider, which decreases red where there is magenta and therefore *increases* *blue*. Increase red slider, and *the hue shifts to* *yellow* where there is green mixed with red and *the hue shifts to* *magenta* where there is blue mixed with red. Decrease red slider, which decreases red and *increases* *green* where there is cyan and *increases* *blue* where there is magenta. *Green channel*: Increase red slider, which increases green where there is red and therefore *the hue shifts to* *yellow* until you get to blue, and then *the hue shifts to* *cyan*. Decrease red slider, which decreases green where there is yellow and therefore *increases* *red*. Increase blue slider, which increases green where there is blue and therefore *the hue shifts to* *cyan* until you get to red, and then *the hue shifts to* *yellow*. Decrease blue slider, which decreases green where there is cyan and therefore *increases* *blue*. Increase green slider, and *the hue shifts to* *cyan* where there is blue and *the hue shifts to* *yellow* where there is red. Decrease green slider, which decreases green and *increases* *red* where there is yellow and *increases* *blue* where there is cyan. *Blue channel*: Increase red slider, which increases blue where there is red and therefore *the hue shifts to* *magenta* until you get to green, and then *the hue shifts to* *cyan*. Decrease red slider, which decreases blue where there is magenta and therefore *increases* *red*. Increase green slider, which increases blue where there is green and therefore *the hue shifts to* *cyan* until you get to red, and then *the hue shifts to* *magenta*. Decrease green slider, which decreases green where there is cyan and therefore *increases* *green*. Increase blue slider, which *the hue shifts to* *cyan* where there is green and *the hue shifts to* *magenta* where there is red. Decrease blue slider, which decreases blue and *increases* *red* where there is magenta and *increases* *green* where there is cyan. On Wed, Sep 2, 2020 at 9:26 AM Mikael Ståldal <mik...@staldal.nu> wrote: > Thanks, but those are not about Darktable: > > https://discuss.pixls.us/t/please-help-me-to-understand-channel-mixer/665 > > https://www.youtube.com/watch?v=zgTLw31PVNs > > > On 2020-09-02 14:23, Bill Martz wrote: > > Here are some links: > > > > > https://discuss.pixls.us/t/mastering-color-with-lab-tone-curves-revisited/19854/17 > > > https://discuss.pixls.us/t/please-help-me-to-understand-channel-mixer/665 > > https://www.youtube.com/watch?v=zgTLw31PVNs > > https://discuss.pixls.us/t/swift-play-with-the-channel-mixer/17244 > > https://discuss.pixls.us/t/using-the-waveform-in-darktable/17427/5 > > > > There is a pdf at the first link that I recommend you download and look > at. > > > > On Tue, Sep 1, 2020 at 3:05 PM Mikael Ståldal <mik...@staldal.nu > > <mailto:mik...@staldal.nu>> wrote: > > > > I have tried to use the channel mixer module, but I don't quite > > understand it. I have only been able to effectively use the presets. > > > > I have read the user manual, but it didn't help much. > > > > I also looked at this video: > https://www.youtube.com/watch?v=ZGvkSTjjtMw > > but it seems like Bruce Williams was quite confused as well. > > > > Any suggestions for documentation or tutorials? > > > ____________________________________________________________________________ > > darktable user mailing list > > to unsubscribe send a mail to > > darktable-user+unsubscr...@lists.darktable.org > > <mailto:darktable-user%2bunsubscr...@lists.darktable.org> > > > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
