Shader Editor and Vertex Paint Color pickers give different Hex values #114040

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Apraxas · 2023-10-22T19:56:20+02:00

Apraxas commented

2023-10-22 19:56:20 +02:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1650/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 536.99

Blender Version
Broken: version: 3.6.4, branch: blender-v3.6-release, commit date: 2023-09-25 13:24, hash: 21bfc5e7fe3f
Worked: Dunno

Short description of error

For some reason, the color pickers are different depending on whether you are inside the shader editor or not, and even give out different Hex values.

I have read that the color picker was intentionally changed to behave like this... but shouldn't the behavior be consistent across the program?

This is causing issues while trying to use vertex colors to drive shader factors, as the values are not mapping properly.
(In this case, I had to go out of my way and copy the hex values from the shader editor picker and then paint, as just painting using the vertex paint tools wasn't working.)

(Note, I am using a custom mixer node that sets each color depending on the factor that goes from 0 to 4, hence the map range node.)

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1650/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 536.99 **Blender Version** Broken: version: 3.6.4, branch: blender-v3.6-release, commit date: 2023-09-25 13:24, hash: `21bfc5e7fe3f` Worked: Dunno **Short description of error** For some reason, the color pickers are different depending on whether you are inside the shader editor or not, and even give out different Hex values. ![image](/attachments/dd469c88-c395-4f90-a9cf-2d5db483f25d) I have read that the color picker was intentionally changed to behave like this... but shouldn't the behavior be consistent across the program? This is causing issues while trying to use vertex colors to drive shader factors, as the values are not mapping properly. (In this case, I had to go out of my way and copy the hex values from the shader editor picker and then paint, as just painting using the vertex paint tools wasn't working.) ![image](/attachments/dc776c80-62e1-46c7-8c48-f7c9491b4aec) (Note, I am using a custom mixer node that sets each color depending on the factor that goes from 0 to 4, hence the map range node.)

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Apraxas added the

labels 2023-10-22 19:56:21 +02:00

Pratik Borhade commented

2023-10-23 05:40:31 +02:00

Hi, thanks for the report. I'm not able to redo this.

I have read that the color picker was intentionally changed to behave like this

Could you share the source of that?

Does this happen with factory settings: File > Defaults > Load Factory Settings

Hi, thanks for the report. I'm not able to redo this. > I have read that the color picker was intentionally changed to behave like this Could you share the source of that? Does this happen with factory settings: `File > Defaults > Load Factory Settings`

Pratik Borhade added

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labels 2023-10-23 05:40:45 +02:00

Apraxas commented

2023-10-23 07:08:42 +02:00

Hello there!

Does this happen with factory settings: File > Defaults > Load Factory Settings

Yeah, at least in the latest stable version, loading default settings did not help.

Could you share the source of that?

blender/blender-manual#95657

From what I gather, there have been various reports about the color picker being odd or inconsistent for a few years now, and it appears it was changed to be gamma corrected by default?

A 0.5 gray value should map to hex #808080, but gamma corrected it gives #BCBCBC.

A work around I found to have the shaders properly read vertex color info is to gamma correct the colors with the formula (Col)^(1/2.2),
but it is still super weird that the color pickers work differently depending on where you are, and without a visual cue either to inform the user the colors are being managed differently.

Shouldn't Blender at least allow the user to choose which kind of color picker to use, gamma corrected or not? (With a checkmark or something?)

A point of concern is asset importing/exporting, however.

1- What when importing an asset with vcols into blender from another software? Are users expected to know that they have to gamma correct the colors if they want to drive the shaders correctly?

2- What if I make an asset in blender and want to export it? What I see in blender is not what I'd get in other software unless I knew of this quirk.

In short: simply making the color picker the same as in shader space everywhere—without giving the user the option to change it—would be a bit risky, as many game engines do not read shader info the same as blender.

Hello there! > Does this happen with factory settings: File > Defaults > Load Factory Settings Yeah, at least in the latest stable version, loading default settings did not help. > Could you share the source of that? https://projects.blender.org/blender/blender-manual/issues/95657 From what I gather, there have been various reports about the color picker being odd or inconsistent for a few years now, and it appears it was changed to be gamma corrected by default? ![Recording 2023-10-23 132156](/attachments/db0ba269-e057-4958-8757-6e695fd80332) A 0.5 gray value should map to hex #808080, but gamma corrected it gives #BCBCBC. A work around I found to have the shaders properly read vertex color info is to gamma correct the colors with the formula (Col)^(1/2.2), but it is still super weird that the color pickers work differently depending on where you are, and without a visual cue either to inform the user the colors are being managed differently. Shouldn't Blender at least allow the user to choose which kind of color picker to use, gamma corrected or not? (With a checkmark or something?) A point of concern is asset importing/exporting, however. 1- What when importing an asset with vcols into blender from another software? Are users expected to know that they have to gamma correct the colors if they want to drive the shaders correctly? 2- What if I make an asset in blender and want to export it? What I see in blender is not what I'd get in other software unless I knew of this quirk. In short: simply making the color picker the same as in shader space everywhere—without giving the user the option to change it—would be a bit risky, as many game engines do not read shader info the same as blender.

Recording 2023-10-23 132156.gif

4.8 MiB

Pratik Borhade added

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labels 2023-10-23 11:07:40 +02:00

Germano Cavalcante commented

2023-10-23 23:45:06 +02:00

This is also something that confuses me. In some places the color values are gamma corrected and others are not. The Hex values however (as mentioned in the UI itself) are always "gamma corrected", so if you want to input colors in sRGB color space (values with "gamma correction" applied) then you need to use the Hex input.

This has already been reported other times. See #100469 for example.
There Brecht commented:

The Brush color is an exception that should be fixed and become scene linear too. The task for that is #72424 ([WIP] Design: Painting Color Management).

The description from f193b1afb3 applies to scene linear colors, which the Brush color is not currently.

Therefore this issue is already known and is being addressed in #72424

For more information about this topic I would suggest consult https://docs.blender.org/manual/en/dev/interface/controls/templates/color_picker.html

This is also something that confuses me. In some places the color values are gamma corrected and others are not. The Hex values however (as mentioned in the UI itself) are always "gamma corrected", so if you want to input colors in sRGB color space (values with "gamma correction" applied) then you need to use the _Hex_ input. This has already been reported other times. See #100469 for example. There Brecht commented: > The Brush color is an exception that should be fixed and become scene linear too. The task for that is #72424 ([WIP] Design: Painting Color Management). > > The description from f193b1afb3 applies to scene linear colors, which the Brush color is not currently. Therefore this issue is already known and is being addressed in #72424 For more information about this topic I would suggest consult https://docs.blender.org/manual/en/dev/interface/controls/templates/color_picker.html

Germano Cavalcante closed this issue

2023-10-23 23:45:09 +02:00

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labels 2023-10-23 23:45:26 +02:00

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