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Checker Texture + RGB Curve generate too bright color
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Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: 67EF:CF ATI Technologies Inc. 4.5.13474 Core Profile Context 22.19.162.4

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-26 19:03, hash: rB155c62b070a9

Short description of error
Checker Texture + RGB Curve generate too bright color. If you bake the diffuse color to a 32 bit float texture in Cycles, the baked texture have too bright value. Bloom effect in Eevee generates spark.

Exact steps for others to reproduce the error
Connect nodes as follow.

  1. Color1 in Checker Texture to White that have max value
  2. Color2 in Checker Texture to Blue that have max value
  3. Fac in RGB Curve to -0.6
  4. Set RGB Curve as following image
  5. Check Bloom in Eevee and rotate viewport

Event Timeline

Looks like an output of RGB Curves explodes when input values are reaching 1.0.


Edit: Tested on this file:

artem ivanov (ixd) added a comment.EditedJun 27 2019, 9:12 AM

I think it's RGB Curves extrapolation bug. Some observations:

GIF:

Changing extend type from Extrapolated to Horizontal fixes the output range.

Sebastian Parborg (zeddb) triaged this task as Confirmed, Medium priority.