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Eevee RGB Curves node inaccurate compared to Cycles
Confirmed, NormalPublic


System Information
Operating system: Linux-5.8.0-7630-generic-x86_64-with-glibc2.32 64 Bits
Graphics card: Quadro RTX 6000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.32.03

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-06-03 08:27, hash: rB2ae4e860f67c
Worked: (newest version of Blender that worked as expected)

Short description of error

The transformation that the RGB curves node applies to a color differs slightly between Eevee and Cycles, even if the curve is left as default.
Not sure if this is a bug or just a known limitation, but it breaks compatibility between Eevee and Cycles in edge cases.

Exact steps for others to reproduce the error

Event Timeline

Pratik Borhade (PratikPB2123) changed the task status from Needs Triage to Confirmed.Sat, Jun 5, 1:00 PM

Can confirm for 3.0.0, Hash: rBca3891e83ba, commit date: 2021-06-03, Same for 2.92.0 and 2.93.0LTS.