https://github.com/darktable-org/darktable/issues/5578

On Thu, Sep 3, 2020 at 1:18 PM Mikael Ståldal <[email protected]> wrote:

> Thanks, good to know. (Would be nice if this was documented though.)
>
> /Mikael
>
>
> On 2020-09-03 18:12, Matt Maguire wrote:
> > 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]
> > <mailto:[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?
> >      >
> >
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