[Bf-committers] color space changes

Kent Mein mein at cs.umn.edu
Fri Nov 12 16:34:28 CET 2010

Hi all,

I was talking to Rant, Author of bug #24559 which was rejected.
He asked me to explain the reason it was rejected.

After looking at it a bit, I'm not so sure we should be rejecting this one.

This has to deal with converting to linear color space.  I think the
current solution is odd to say the least.

Try this little experiment.
Load up the gimp, use the color picker to pick a color.
Something like RGB 113 196 201

paint the entire picture that color and save the file.

Load up blender, and open your image in the image editor.
and use the color sampler to sample the color.
Now in Hex I have color 71C4CA  in both programs.
In RGB though in blender I have .165  .552 .591
Now I get that it's a different color space but if I
had chosen a different work flow, example:
I had used 113 196 201 and converted them to 0.0-1.0 range
I would get totally different numbers, something like:
.441 .765  .785

It might make this simpler if we had a check box in the
color picker for gamma corrected or not.  Default on.
If you unselect it, then you get linear color space, and
all values are converted, (Hex = N/A for uncorrected?)

Anyway what does everyone else think?

The color correction is suppose to make our lives easier,
right now though I'm more confused when looking at colors
between multiple programs.

Links for people that want more info:

mein at cs.umn.edu

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