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/ > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 > _______________________________________________ > Darktable-users mailing list > Darktable-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/darktable-users ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Darktable-users mailing list Darktable-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-users
