viewport and gpu compositor rgb curves difference #116522

New Issue

kevin donovan · 2023-12-24T23:08:26+01:00

kevin donovan commented

2023-12-24 23:08:26 +01:00

System Information
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: AMD Radeon RX 5700 ATI Technologies Inc. 4.6.0 Core Profile Context 23.12.1.231124

Blender Version
Broken: version: 4.1.0 Alpha, branch: main, commit date: 2023-12-24 07:18, hash: 2794afc84e15
Worked: (newest version of Blender that worked as expected)

Short description of error
RGB Curves node (unmodified) is modifying a black and white channel in Viewport Compositor and GPU execution mode (from "Experimental Compositors") for the main compositor. Tiled and Full Frame does not have the issue.

Exact steps for others to reproduce the error

Download image and .blend file attached
Open the .blend file (ensure the image is found)
Render compositing
Compare the result of the "Viewer Node" in the Image Editor with the 3D View (sometimes you have to switch the Viewport Shading to update)

Additionally:

enable "Experimental Compositors" in the Preferences.
Compare the "Execution Mode" GPU, Full Frame and Tiled. GPU has the issue.

If you mute the RGB Curves node the issue is gone.

**System Information** Operating system: Windows-10-10.0.22631-SP0 64 Bits Graphics card: AMD Radeon RX 5700 ATI Technologies Inc. 4.6.0 Core Profile Context 23.12.1.231124 **Blender Version** Broken: version: 4.1.0 Alpha, branch: main, commit date: 2023-12-24 07:18, hash: `2794afc84e15` Worked: (newest version of Blender that worked as expected) **Short description of error** `RGB Curves` node (unmodified) is modifying a black and white channel in Viewport Compositor and `GPU` execution mode (from "Experimental Compositors") for the main compositor. `Tiled` and `Full Frame` does not have the issue. ![](attachments/92a2a7ed-7ea3-4689-8898-83ec3caccf6b) **Exact steps for others to reproduce the error** - Download image and .blend file attached - Open the .blend file (ensure the image is found) - Render compositing - Compare the result of the "Viewer Node" in the Image Editor with the 3D View (sometimes you have to switch the Viewport Shading to update) Additionally: - enable "Experimental Compositors" in the Preferences. - Compare the "Execution Mode" `GPU`, `Full Frame` and `Tiled`. `GPU` has the issue. If you mute the `RGB Curves` node the issue is gone.

rgbcurbes.blend

3.2 MiB

Matas_Alexa_Mini_sample_BT709.exr

4.3 MiB

rgbcurves.jpg

190 KiB

kevin donovan added the

labels 2023-12-24 23:08:27 +01:00

Germano Cavalcante commented

2023-12-27 15:15:33 +01:00

I can confirm the issue you reported with the RGB Curves node in the viewport compositor and GPU execution mode. Thank you for bringing this to our attention.

Currently, the experimental feature you mentioned has been in development for some time (#88150). I'm not sure of its current status, but I will forward your report to the developers for further investigation.

@OmarEmaraDev, do you have any insights on this issue?

I can confirm the issue you reported with the RGB Curves node in the viewport compositor and GPU execution mode. Thank you for bringing this to our attention. Currently, the experimental feature you mentioned has been in development for some time (#88150). I'm not sure of its current status, but I will forward your report to the developers for further investigation. @OmarEmaraDev, do you have any insights on this issue?

Germano Cavalcante added

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viewport and gpu compositor rgb curves difference #116522