About the version, it is 2.0.1, indeed!
The clipping tip seems to work well, at least on the example I gave (but
I'm confident for my other pictures).
Thanks for the help,
Pierre.
2016-02-11 14:01 GMT+01:00 johannes hanika <hana...@gmail.com>:
> hi,
>
> On Thu, Feb 11, 2016 at 1:27 PM, Matthieu Moy
> <matthieu....@grenoble-inp.fr> wrote:
> > Pierre Feissel <piter.fiz...@gmail.com> writes:
> >
> >> Hi,
> >>
> >> I moved to darktable 2.0 then 2.1 through the standard updates of
> >> opensuse 13.2.
> >
> > Be careful: 2.1 is the development version, the latest stable is 2.0.1.
> >
> > Reporting bugs on the development version is probably appreciated from
> > the devs, but I don't think you want to use it in production.
> >
> >> Everything seem as nice as usual, except I have a problem with the
> >> tone curve module : when I turn on the tone curve module, the colors
> >> of the pictures are modified (even if, the module is set to what I
> >> think is "no effect" - untouch diagonal curve). Then, when moving the
> >> curve, it sometimes yields strange results (e.g. black zones). On the
> >> following link is an example of applying a neutral tone curve (on the
> >> right with the tone curve on) :
> >>
> >> https://goo.gl/photos/KUwodMNUroqnS2pe7
> >
> > I don't know how a "no effect" curve could trigger this, but this looks
> > like an artefact due to out-of-gamut colors early in the pipeline (like
> > negative L value), which can trigger weird artefacts like this.
>
> yes, that would be my guess, too. the curve works with a look up table
> that doesn't support negative values of L,a or b. you're clamping
> those away. theoretically these shouldn't even be there in the first
> place (but happen due to linear matrix approximation of the input
> colour space etc), so the gamut clipping hint may be a good one.
>
> -jo
>
> >
> > See the gamut clip option of the input color profile:
> >
> >
> https://www.darktable.org/usermanual/ch03s04s03.html.php#input_color_profile
> >
> > It may or may not help, just a guess.
> >
> > --
> > Matthieu Moy
> > http://www-verimag.imag.fr/~moy/
> >
> >
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