Freestyle lines in Cycles are in an unexpected color space #44048
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Reference: blender/blender#44048
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Version: 2.73 (but also 2.74 rc2) linux 64
How to reproduce:
If this is an intentional aspect of Freestyle in Cycles, I cannot figure out why.
Cycles_Freestyle_Color_space.blend
Changed status to: 'Open'
Added subscriber: @rocketman
Added subscribers: @kjym3, @JulianEisel
@kjym3, Sounds similar to #43624, maybe same fix is needed again?
Thanks for the problem report. The issue looks like related to color management. I will look into it and come back to you with updates.
Added subscribers: @Sergey, @ThomasDinges
Freestyle generates a temporary scene to render strokes using Cycles. The temporary scene is populated by mesh objects representing the strokes. The upper half of the screen capture below shows the (slightly simplified) shader setttings used for the stroke meshes. Stroke colors are taken from a vertex color layer ('Color') and fed to an Emission node. As shown in the Python console at the left bottom of the screen capture, the color in the vertex color layer matches with the Freestyle Line color in question. The same screen capture confirms that the line color in the rendering result is darker than it should be.
Now if the Freestyle Line color is specified directly by the Emission node (without relying on the vertex color layer) as shown in the lower half of the image below, then the rendered line color becomes correct.
So the problem comes from the color sources from which the diffuse color of stroke meshes is taken.
@Sergey, @ThomasDinges, do you guys have any insight about the documented color differences between an Emission color and a vertex color layer in Cycles?
I don't think it's something cycles-specific. All the light (including Emission) in render engines is in linear space. And vertex color in blender is in sRGB space i would think.
So what you can do is to linearize the color when creating emission shader by calling
srgb_to_linearrgb_v3_v3
. It's not totally correct from the CM pipeline, but it's as good as we can do now.This issue was referenced by
fc7c856da2
Changed status from 'Open' to: 'Resolved'
The fix is very much appreciated, thanks Brecht.