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Compositor RGB Curves artefacts with 'film like' option
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Description

System Information
Operating system: SUSE Leap 15.0
Graphics card: NVidia GTX 560ti (official drivers)

Blender Version
Broken: 2.80, 5632e1b52586, x86_64 linux, 2019-01-24 (buildbot)

Short description of error
Compositor RGB Curves node gives false colours when set to 'Film like' and when any of R,G,B channels are adjusted. Adjustment of C channel alone is OK.

sidenote; Constant hue adjustment is definitely an interesting feature to have! But since film often has various hue shifts going on, if anything, 'Standard' is possibly closer with a typical S-curve - a bias to cyan, magenta, yellow in the highlights corresponding to the curve shoulder.

'Hue hold' or 'Hue lock' could be alternative names.

Example .blend

Exact steps for others to reproduce the error
Load attached .blend, render.

Ref:
https://developer.blender.org/rB4de7c0c3105a80d244dd9f2078c310331873a16b

Notes:

  • Muting the noise texture hides the issue in this example.
  • Stepping through the emission strength from 0.0 to 1.0 gives varying results. Might be a clue to the cause?

Details

Type
Bug

Event Timeline

This comment was removed by Jeroen Bakker (jbakker).