The problem is that the channel mixer has a clamping function which limits the values that are allowed to pass through. This is not appropriate behaviour for the scene-referred part of the pixel pipe, as it can result in exactly the symptoms you report. The devs are aware of this, and there are multiple PRs looking at how to solve this. I would expect that in darktable 3.4 they should settle on one of the solutions being proposed.
On Fri, 4 Sep 2020 at 02:06, Mikael Ståldal <[email protected]> wrote: > After playing around with the channel mixer on some pictures, I get an > odd effect sometimes. Just enabling the module with default settings > sometimes affects the picture, the histogram jumps to the left and I > lose detail in the highlights. Seems to happen when I also use filmic > RGB. Is this intended, or a bug? > > > On 2020-09-01 21:04, Mikael Ståldal 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 > > [email protected] > > > > ____________________________________________________________________________ > darktable user mailing list > to unsubscribe send a mail to > [email protected] > > ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
