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Maniphest T91924

Regular Vertex and Sculpt Vertex paint brightness difference
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-09-27 18:29, hash: rBc53ffda8a496
Worked: don't know
Short description of error
I used sculpt vertex paint to paint a sphere and converted (stored) the sculpt vertex to regular vertex paint. That results in different brightness values.

Exact steps for others to reproduce the error
Open the file and switch the sculpt vertex color (Color) and the regular vertex color (Col). There is a massive difference when it comes to the brightness.

regular vertex and sculpt vertex paint brightness difference.blend911 KBDownload

You can replicate the bug by using sculpt vertex paint on an object, store the sculpt vertex color to a regular vertex color layer and compare both in material or render preview via shader nodes and or via viewport shading and the vertex option.

Regular vertex color should have the correct brightness i believe.