Color space seems wrong while painting in image editor. #68242

New Issue

anthony · 2019-08-05T00:45:40+02:00

anthony commented

2019-08-05 00:45:40 +02:00

In the image editor add a new image and with default settings just do a red line paint over a green line paint.
Dark zone appear in the falloff between red and green. it should not be there and should stay clear, not dark.
I don't know why, but it looks like a color space issue.

dark falloff not ok in blender:

clear falloff ok in gimp:

blender 2.8
Windows 7

In the image editor add a new image and with default settings just do a red line paint over a green line paint. Dark zone appear in the falloff between red and green. it should not be there and should stay clear, not dark. I don't know why, but it looks like a color space issue. dark falloff not ok in blender: ![Capture dark fallof.PNG](https://archive.blender.org/developer/F7649279/Capture_dark_fallof.PNG) clear falloff ok in gimp: ![Capture fallof ok.PNG](https://archive.blender.org/developer/F7649281/Capture_fallof_ok.PNG) blender 2.8 Windows 7

anthony commented

2019-08-05 00:45:40 +02:00

Added subscriber: @small

Rodger Davis commented

2019-08-05 01:10:04 +02:00

Added subscriber: @RodDavis

Yevgeny Makarov commented

2019-08-05 08:32:49 +02:00

Added subscriber: @jenkm

Yevgeny Makarov commented

2019-08-05 08:32:49 +02:00

This comment was removed by @jenkm

*This comment was removed by @jenkm*

William Reynish commented

2019-08-05 21:02:54 +02:00

Added subscribers: @troy_s, @WilliamReynish

William Reynish commented

2019-08-05 21:02:54 +02:00

@troy_s Bug or not?

Troy Sobotka commented

2019-08-05 21:18:58 +02:00

Bug!

But it’s a deep rabbit hole that requires attention.

The painting is nonlinear encoding math as a glance. There’s also possible alpha elements, but this will happen any time you apply light transport math to something that is nonlinear light encoded.

All manipulations must be done upon linear light ratios, which is not happening here. This cascades into deeper bit depth internal representation, and selectable transforms on a per UI basis.

This should have likely been tackled years ago, before coupling more problems on top of the stack. But alas, here we are. Probably better to try and tackle it now.

https://medium.com/the-hitchhikers-guide-to-digital-colour/the-hitchhikers-guide-to-digital-colour-question-9-why-the-f-ck-is-linear-light-important-for-a-48e32309b9ca

Bug! But it’s a deep rabbit hole that requires attention. The painting is nonlinear encoding math as a glance. There’s also possible alpha elements, but this will happen any time you apply light transport math to something that is nonlinear light encoded. All manipulations must be done upon linear light ratios, which is not happening here. This cascades into deeper bit depth internal representation, and selectable transforms on a per UI basis. This should have likely been tackled years ago, before coupling more problems on top of the stack. But alas, here we are. Probably better to try and tackle it now. https://medium.com/the-hitchhikers-guide-to-digital-colour/the-hitchhikers-guide-to-digital-colour-question-9-why-the-f-ck-is-linear-light-important-for-a-48e32309b9ca

Troy Sobotka was assigned by William Reynish

2019-08-05 21:37:16 +02:00

William Reynish commented

2019-08-05 21:37:16 +02:00

Assigning to you then :) Feel free to re-assign.

Philipp Oeser commented

2019-08-05 22:20:57 +02:00

Added subscriber: @lichtwerk

Jeroen Bakker commented

2019-11-27 08:24:53 +01:00

Added subscriber: @Jeroen-Bakker

Troy Sobotka was unassigned by Dalai Felinto

2019-12-23 16:33:24 +01:00

Ahmed Jarad commented

2022-09-04 22:23:20 +02:00

Added subscriber: @end_ahmed

Philipp Oeser removed the

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Color space seems wrong while painting in image editor. #68242