Am 30.09.2016 um 11:11 schrieb Tobias Ellinghaus:
Am Freitag, 30. September 2016, 09:26:33 CEST schrieb Christian Mandel:
>
[...]
Is there any chance that the alpha layer (if it is present at input) can
be processed along the RGB channels of the image and that the result can
optionally be added as alpha channel to the output?
Not with the current design of darktable. In the long run I could envision a
I've created feature request https://redmine.darktable.org/issues/11186
to keep track.
way to have extra pixel buffers (mostly alpha channels) that could be loaded
with the image and passed through geometry changing steps. So you wouldn't be
able to edit the channel itself
In my case that would not be necessary, since only geometry changes are
relevant.
(unless there was a module specifically written
to do that, like an inpainting iop for scratch removal ;)) but at least the
Of course I was thinking about this possibility as well. However, the
internal infrastructure would be needed anyway, so the scratch removal
module would be the least problem and a low hanging fruit after the
infrastructure changes.
The scratch removal sketch we discuss on pixls.us is a simple G'MIC
one-liner. Simultaneously, David Tschumperlé announced the work on a
general G'MIC plugin effort
(https://discuss.pixls.us/t/gaap-gmic-as-a-plug-in-work-in-progress). Of
course, the idea of adding it to darktable immediately suggests itself,
despite the many reasons against such a plan (QT being one of them).
That said, for me an external inpainting solution would be fine,
especially since it does not have to mess with colours and therefore
problems with this workflow seem unlikely.
alpha channel could be used in the exported image. But as I said, that is
nothing to be expected anytime soon and would require some discussions with
the other devs first.
Thanks for considering my idea, I'll try to keep an eye on IRC the next
hours/days ;-).
Best regards
Chris
Test image can be found here: https://filebin.net/gehwnhsxwi48qjb8 (150 MB).
Thanks & best regards
Chris
Tobias
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