sRGB color profile does not save with image #121173

New Issue

Robert S · 2024-04-27T22:17:34+02:00

Robert S commented

2024-04-27 22:17:34 +02:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 552.12

Blender Version
Broken: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: e1743a0317bc
Worked: (newest version of Blender that worked as expected)

Short description of error
Having a heck of a difficult time using texture painting: https://blenderartists.org/t/textures-and-alpha-modes-oh-my/1161715/21?u=eobet

Exact steps for others to reproduce the error

Import PNG with sRGB profile
Texture paint on it and save it (even using "save as" with "srgb" explicitly set).

Expected:

Image should save with sRGB color profile.

Result:

Image (at least by confirming with Affinity Photo) does not get saved with any color profile.

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 552.12 **Blender Version** Broken: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: `e1743a0317bc` Worked: (newest version of Blender that worked as expected) **Short description of error** Having a heck of a difficult time using texture painting: https://blenderartists.org/t/textures-and-alpha-modes-oh-my/1161715/21?u=eobet **Exact steps for others to reproduce the error** 1. Import PNG with sRGB profile 2. Texture paint on it and save it (even using "save as" with "srgb" explicitly set). Expected: Image should save with sRGB color profile. Result: Image (at least by confirming with Affinity Photo) does not get saved with any color profile.

Robert S added the

labels 2024-04-27 22:17:35 +02:00

Richard Antalik commented

2024-04-28 04:09:04 +02:00

Looking at saved image with GIMP, I see sRGB colorspace in metadata. Or am I misunderstanding this? Either way, can you upload image that has this profile and one that has not?

Richard Antalik added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2024-04-28 04:09:14 +02:00

Robert S commented

2024-04-28 09:33:18 +02:00

Krita also reports no color profile:

Here's the image. There's a few red pixels in the middle of it which I just painted using Blender:

Krita also reports no color profile: ![image](/attachments/fbfa35c0-4133-42d9-87fd-e4f59eca0b6e) Here's the image. There's a few red pixels in the middle of it which I just painted using Blender:

terrain-color-adjust.png

132 KiB

image.png

8.1 KiB

Richard Antalik commented

2024-04-29 05:58:13 +02:00

Can you upload the image that has the color profile still embedded? I am a bit confused though, since my understanding is, that color profile controls how the colors within image are displayed on particular device, so not sure why this data needs to be embedded in image.

BTW, I have found this article: https://www.blendernation.com/2022/03/04/embedding-icc-profiles-into-renders/
Also I have checked metadata with online viewer, GIMP seems to correct these when image is loaded, and the colorspace is not actually defined.

As far as embedding ICC profiles, I still don't understand why this would be even good idea. But missing colorspace is not great I guess. With PNG's there is assumption, that it will be sRGB, but IMO it could be specified in metadata. Would have to look in code how hard this would be.

Can you upload the image that has the color profile still embedded? I am a bit confused though, since my understanding is, that color profile controls how the colors within image are displayed on particular device, so not sure why this data needs to be embedded in image. BTW, I have found this article: https://www.blendernation.com/2022/03/04/embedding-icc-profiles-into-renders/ Also I have checked metadata with online viewer, GIMP seems to correct these when image is loaded, and the colorspace is not actually defined. As far as embedding ICC profiles, I still don't understand why this would be even good idea. But missing colorspace is not great I guess. With PNG's there is assumption, that it will be sRGB, but IMO it could be specified in metadata. Would have to look in code how hard this would be.

Robert S commented

2024-04-29 18:48:07 +02:00

It's important to understand that there is no "still" here. I created the image inside of Blender and I painted it inside of Blender. For the above image, in my actual working project, it never saves with sRGB embedded. Unfortunately, attempting to recreate this in a minimal example has failed so far.

I can, however, upload a version which I consider "destroyed by Blender". Again, neither of these have been edited in an external application and they all original from the same Blender created new image. I'm trying to make sense of the behavior I'm seeing but currently I can't (though I suspect the issue lies with the thread I linked).

It's important to understand that there is no "still" here. I created the image inside of Blender and I painted it inside of Blender. For the above image, in my actual working project, it never saves with sRGB embedded. Unfortunately, attempting to recreate this in a minimal example has failed so far. I can, however, upload a version which I consider "destroyed by Blender". Again, neither of these have been edited in an external application and they all original from the same Blender created new image. I'm trying to make sense of the behavior I'm seeing but currently I can't (though I suspect the issue lies with the thread I linked).

terrain-color-DESTROYED-BY-BLENDER.png

125 KiB

terrain-color-UNTOUCHED-BACKUP.png

60 KiB

Richard Antalik commented

2024-05-09 16:33:21 +02:00

Thanks for update and sorry for late response. Tried to replicate the issue with provided file, but it seems to work fine for me. See attached image. Even Krita does not complain, when loading this file.

I have checked with 4.1 version and 4.2, both produced the same result. Could it be, that you use custom OCIO config?

Thanks for update and sorry for late response. Tried to replicate the issue with provided file, but it seems to work fine for me. See attached image. Even Krita does not complain, when loading this file. I have checked with 4.1 version and 4.2, both produced the same result. Could it be, that you use custom OCIO config?

xxx.png

65 KiB

Robert S commented

2024-05-12 10:52:38 +02:00

I haven't made any deliberate changes in that area, but yeah, I too have now failed in replicating it in an empty file.

I wonder if some of what I'm seeing is due to this (which is now from a workaround where I'm separating out the alpha to a different image, but I noticed that the corresponding geometry node doesn't have the color space selection... which shouldn't affect how a texture painted image is saved, but still):

I haven't made any deliberate changes in that area, but yeah, I too have now failed in replicating it in an empty file. I wonder if some of what I'm seeing is due to this (which is now from a workaround where I'm separating out the alpha to a different image, but I noticed that the corresponding geometry node doesn't have the color space selection... which shouldn't affect how a texture painted image is saved, but still): ![726fd6063d6ebd19c02d3d11094f927754d75e9d](/attachments/70b8e397-bb46-4598-aead-1dbd097dd604)

726fd6063d6ebd19c02d3d11094f927754d75e9d.png

154 KiB

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sRGB color profile does not save with image #121173