Unable to accurately sample colors in Vertex Paint mode #87183

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opened 2021-04-04 03:11:23 +02:00 by Ryan Inch · 8 comments

Ryan Inch commented

2021-04-04 03:11:23 +02:00

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System Information
Operating system: Linux-5.10.11-arch1-1-x86_64-with-arch 64 Bits
Graphics card: GeForce GTX 660M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.39

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 02948a2cab
Broken version: 2.83.1
Worked: 2.79b

Short description of error
Sampling colors in Vertex Paint mode is unreliable even in flat shading or when utilizing an emission shader and standard color management (although this reports the correct color some of the time) in both Cycles and Eevee.

Exact steps for others to reproduce the error

With the default cube selected, enter Vertex Paint mode.
Switch the viewport shading to Solid, the lighting to Flat, and the color to Vertex.
Change the brush color to #000003.
Go to the Paint menu and select Set Vertex Colors (or press Shift+K)
Sample the color on the cube by either using the eyedropper from a color picker, or pressing S with the mouse hovering over the cube (doesn't matter if Sample Merged is checked or not)
Check the brush color and see that it has changed to some other color (#010103 on my machine)

**System Information** Operating system: Linux-5.10.11-arch1-1-x86_64-with-arch 64 Bits Graphics card: GeForce GTX 660M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.39 **Blender Version** Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: `02948a2cab` Broken version: 2.83.1 Worked: 2.79b **Short description of error** Sampling colors in Vertex Paint mode is unreliable even in flat shading or when utilizing an emission shader and standard color management (although this reports the correct color some of the time) in both Cycles and Eevee. **Exact steps for others to reproduce the error** 1. With the default cube selected, enter Vertex Paint mode. 2. Switch the viewport shading to Solid, the lighting to Flat, and the color to Vertex. 3. Change the brush color to #000003. 4. Go to the Paint menu and select Set Vertex Colors (or press Shift+K) 5. Sample the color on the cube by either using the eyedropper from a color picker, or pressing S with the mouse hovering over the cube (doesn't matter if Sample Merged is checked or not) 6. Check the brush color and see that it has changed to some other color (#010103 on my machine)

Ryan Inch commented

2021-04-04 03:11:23 +02:00

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Added subscriber: @Imaginer

Added subscriber: @Imaginer

Pratik Borhade commented

2021-04-04 03:29:41 +02:00

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Added subscriber: @PratikPB2123

Added subscriber: @PratikPB2123

Pratik Borhade commented

2021-04-04 03:29:41 +02:00

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I can see the change in color Hex value. Tested on 2.93.0 alpha latest build .

I can see the change in color Hex value. Tested on 2.93.0 alpha latest build .

Ryan Inch commented

2021-04-04 03:33:38 +02:00

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Thanks. If you have a color wheel open somewhere you'll see the dot jump to a different position too.

Thanks. If you have a color wheel open somewhere you'll see the dot jump to a different position too.

Evan Wilson commented

2021-04-04 16:02:09 +02:00

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Added subscribers: @Jeroen-Bakker, @EAW

Added subscribers: @Jeroen-Bakker, @EAW

Evan Wilson commented

2021-04-04 16:02:09 +02:00

Member

IIRC, @Jeroen-Bakker has written somewhere that this is due to vertex paint using the old hardcoded color pipeline that has yet to be updated.

IIRC, @Jeroen-Bakker has written somewhere that this is due to vertex paint using the old hardcoded color pipeline that has yet to be updated.

Jeroen Bakker commented

2021-04-05 00:48:10 +02:00

Member

This might be caused by the viewport dithering...

This might be caused by the viewport dithering...

Philipp Oeser commented

2021-04-06 16:05:51 +02:00

Member

Changed status from 'Needs Triage' to: 'Confirmed'

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser removed the

Sculpt, Paint & Texture

label 2023-02-10 09:11:59 +01:00

Germano Cavalcante referenced this issue

2024-01-18 20:04:16 +01:00

Displayed color doesn't match real values #117276

Samuel referenced this issue

2024-01-22 18:36:59 +01:00

Displayed color doesn't match real values #117276

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Reference: blender/blender#87183

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