Checker Texture + RGB Curve generate too bright color #66165

New Issue

Kinouti Takahiro · 2019-06-27T05:33:03+02:00

Kinouti Takahiro commented

2019-06-27 05:33:03 +02:00

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: 155c62b070

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.

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

**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: `155c62b070` **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. ![checker-rgb-curve-spark.gif](https://archive.blender.org/developer/F7551217/checker-rgb-curve-spark.gif) **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 ![checker-plus-rgb-curve.jpg](https://archive.blender.org/developer/F7551215/checker-plus-rgb-curve.jpg)

Kinouti Takahiro commented

2019-06-27 05:33:03 +02:00

Added subscriber: @dskjal-1

artem ivanov commented

2019-06-27 07:19:12 +02:00

Added subscriber: @ixd

artem ivanov commented

2019-06-27 07:19:12 +02:00

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

Edit: Tested on this file:
rgb_curves_bug.blend

Looks like an output of RGB Curves explodes when input values are reaching 1.0. ![image.png](https://archive.blender.org/developer/F7551270/image.png) *Edit: Tested on this file:* [rgb_curves_bug.blend](https://archive.blender.org/developer/F7551339/rgb_curves_bug.blend)

artem ivanov commented

2019-06-27 09:12:32 +02:00

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

GIF:

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

I think it's RGB Curves extrapolation bug. Some observations: ![image.png](https://archive.blender.org/developer/F7551369/image.png) GIF: ![efawef4.gif](https://archive.blender.org/developer/F7551402/efawef4.gif) Changing *extend type* from Extrapolated to Horizontal fixes the output range. ![image.png](https://archive.blender.org/developer/F7551383/image.png)

Sebastian Parborg self-assigned this 2019-06-28 10:39:37 +02:00

Sebastian Parborg commented

2019-06-28 16:34:36 +02:00

I've posted a fix: D5151

I've posted a fix: [D5151](https://archive.blender.org/developer/D5151)

blender-admin commented

2019-07-03 16:20:20 +02:00

This issue was referenced by 5277557755

This issue was referenced by 5277557755eb32a527addbf47e09de3a781f96ed

Brecht Van Lommel commented

2019-07-03 17:20:36 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2019-07-03 17:20:36 +02:00

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Checker Texture + RGB Curve generate too bright color #66165