Eevee/Workbench: Single channel byte textures mangles pixels in viewport #114414
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Reference: blender/blender#114414
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System Information
Operating system: Linux-6.5.7-gentoo-x86_64-AMD_Ryzen_9_5950X_16-Core_Processor-with-glibc2.37 64 Bits, X11 UI
Graphics card: NVIDIA RTX A6000/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 535.113.01
Blender Version
Broken: version: 4.0.0 Beta, branch: blender-v4.0-release, commit date: 2023-10-30 23:38, hash:
b27ff093caa0Broken: version: 3.6.5
Worked: version: 3.5.1
Short description of error
Exact steps for others to reproduce the error
Extracted from the cube diorama demo file:
eevee_linear_rec709.blend
Assigning to me to check what the issue is, what is expected (what shows 3.6).
Some parts that might be different is that 4.0 has a new OCIO configuration.
Thanks for the report, @SimonThommes. I can confirm.
The issue is not only seen in EEVEE, Workbench also has the same problem. It only seems to work well on Cycles.
If I'm not mistaken, the Linear Rec.709 color space was introduced in
6923f7a153, so is this something for @Eary or @Sergey take a look?EDIT:
I didn't see the comment from @Jeroen-Bakker
Just copied and pasted 3.6's config to 4.1 and it produces the same behavior:
And tried opening this file with 3.6:
Confirmed this has nothing to do with specific config.
It's more of a "when you set the source colorspace to be the scene_linear role space" in general. Since 3.6 config also features a
scene_linearrole space, this is not unique to 4.0/4.1, and is also the case in 3.6.Also worth noting that the problem doesn't appear anymore if you save a JPG and re-import again:
EDIT:
OK, figured out that I saved an RGB three channel jpg, therefore don't have the issue anymore. Saving BW single JPG does still cause the issue.
Issue is related to how the GPU texture is created for this type of image. (R8_UNORM) this is a CPU side issue inside the blender kernel (BKE_image_gpu.*) Issue is also present in Blender 3.6 so I expect it to be introduced when making OIIO as default reader. Blender 3.5 displays the image correctly.
Internally JPEGs are stored in an 4 channel image buffer, but the number of planes are still for a single channel (8). The GPU texture creates a single channel image, but loads 4 channel image data. Storing JPEGs in a 4 channel image buffer was done even before Blender 2.8, but apparently the bitplanes are not correct anymore.
Eevee: Linear Rec.709 mangles pixels of single channel textureto Eevee/Workbench: Single channel byte textures mangles pixels in viewportWill raise priority quoting @fclem from chat : "We just found #114414 that seems quite bad"