Wrong behavior of color curves (color management) #67324
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Reference: blender/blender#67324
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System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86
Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-18 14:52, hash:
38d4483c6a
Short description of error
As you can see, all colors from right part, that equal or lower than maximum point are black. So I can`t even shift all colors after certain threshold to white.
untitled.blend
maps for test:
https://hdrihaven.com/hdri/?h=red_hill_straight
https://hdrihaven.com/hdri/?h=colosseum
2019-07-20_16-03-44.mp4
Exact steps for others to reproduce the error
Try to play with color correction curve as on the video
p.s. check other curve-converters to be sure.
Added subscriber: @Vyach
This comment was removed by @Vyach
Added subscriber: @brecht
Changed status from 'Open' to: 'Archived'
Try disabling "Use Clipping" and zoom out. You will see that the curve is extrapolated downwards, which will make higher colors black. I don't see a bug in the extrapolation, it's just a result of the curve shape you created.
@brecht what kind of clipping? I can`t find such option for Evee.
Now I see the idea: there is invisible part of curve, and it`s direction depends on previous two curve nodes.
But why parallel line cause zero brightness? Looks like «forget common sence, here is special math logic»
Click the icon with the disk inside the box, that has the clipping options.
@brecht thanks, a lot and sorry for disturbing. Now I see how curve behave in third case.