[Bf-committers] regarding color correction and images

[Brecht Van Lommel]

Already discussed this on IRC, so just sending here for completeness.
I was sent this image which I think was made by David. The problems
shown there I can also redo in Gimp and Mypaint. It depends on the
brush falloff as well, different curves make the problem more/less
obvious, but after tuning settings to be more similar, I can't see a
difference really.
http://www.pasteall.org/pic/show.php?id=12884

When painting float images, we definitely need to ensure it gets done
in the color space of that image, and painting images with scene
linear color may well give better results there. But for 8 bit images,
it seems the problem is more in the default brush curve, and perhaps
the brush accumulation (projection paint already implements behavior
more like other apps, keeping track of where it has already painted in
a stroke, the image editor doesn't yet).

2011/5/27 Ρυακιωτάκης Αντώνης <kalast at gmail.com>:
> Hi brecht, I am not a painter myself so I asked advice from David Revoy, who
> made the initial request to LetteRip when he was asking for wishlist
> features for this GSoC. We had a test session yesterday and it seems like
> the behavior he thinks works correctly is the one outlined above (convert
> user brush color to RGB, do math in linear RGB space, convert data to sRGB
> and send for display). So indeed this looks like a color management issue.
> I thought from reading
> this<http://www.blender.org/development/release-logs/blender-256-beta/color-management/>page
> that this the way things are supposed to work anyway.
>
> I am not sure whether different software works this way, to tell you the
> truth I was not even aware of such issues until it was brought to my
> attention. I will post a test request on blenderartists and see what
> responses I get. I think it is important that there is sufficient knowledge
> regarding color management status so that a conscious decision can be made
> by the developers and the users are aware of the issues.
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