Glare node posterizes the image #118446

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opened 2024-02-19 05:39:18 +01:00 by Yegor · 7 comments

Yegor commented

2024-02-19 05:39:18 +01:00

System Information
Operating system: Linux-5.15.0-94-generic-x86_64-with-glibc2.35 64 Bits, X11 UI
Graphics card: NVIDIA GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 525.147.05

Blender Version
Broken: version: 4.1.0 Beta, branch: blender-v4.1-release, commit date: 2024-02-15 17:25, hash: 401a2397db20
Worked: (newest version of Blender that worked as expected)

Short description of error
There are four situations.

AgX in viewport compositor - posterizes.
Filmic in vewport compositor - posterizes.
AgX in post compositor - posterizes.
Filmic in post compositor - doesn't posterize.

Exact steps for others to reproduce the error
Render the attached file or turn render in viewport and enable compositor.

**System Information** Operating system: Linux-5.15.0-94-generic-x86_64-with-glibc2.35 64 Bits, X11 UI Graphics card: NVIDIA GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 525.147.05 **Blender Version** Broken: version: 4.1.0 Beta, branch: blender-v4.1-release, commit date: 2024-02-15 17:25, hash: `401a2397db20` Worked: (newest version of Blender that worked as expected) **Short description of error** There are four situations. 1. AgX in viewport compositor - posterizes. ![image](/attachments/b78b7dd9-4ff3-47a4-a59e-d4c9b8ab4549) 2. Filmic in vewport compositor - posterizes. ![image](/attachments/ad67b33a-6f89-419e-a0b6-01620ef5ec12) 3. AgX in post compositor - posterizes. ![image](/attachments/8a00b31d-2b3e-4a86-8488-966ba6d43a79) 4. Filmic in post compositor - doesn't posterize. ![image](/attachments/49a1dad8-ab87-4fc0-94b8-d76436031a64) **Exact steps for others to reproduce the error** Render the attached file or turn render in viewport and enable compositor.

152 KiB

glare_posturize.blend

879 KiB

166 KiB

153 KiB

143 KiB

Yegor added the

labels 2024-02-19 05:39:19 +01:00

Pratik Borhade commented

2024-02-19 09:54:55 +01:00

Member

Thanks for the report. Can confirm

Thanks for the report. Can confirm

Pratik Borhade added

and removed

labels 2024-02-19 09:55:13 +01:00

Omar Emara commented

2024-02-19 16:34:36 +01:00

Member

What do you mean by posterizes? Can you clarify the issue?

What do you mean by posterizes? Can you clarify the issue?

Yegor commented

2024-02-19 16:49:34 +01:00

Author

See the harsh separation line around highlights. Should be a smooth roll off. You can also search for 'posterization effect' to get more examples.
This may be confused over a specular spot, but it's diffuse. I should've done the screenshots without spec. You can dial the spec to 0 and get the same effect.
Here's an example. Diffuse only

See the harsh separation line around highlights. Should be a smooth roll off. You can also search for 'posterization effect' to get more examples. This may be confused over a specular spot, but it's diffuse. I should've done the screenshots without spec. You can dial the spec to 0 and get the same effect. Here's an example. Diffuse only ![image](/attachments/2f2d2a45-466b-4136-97d4-13849e1c8efe)

162 KiB

Omar Emara commented

2024-02-19 17:09:56 +01:00

Member

This is due to the harsh thresholding function that the glare node uses. I do agree that this not a great way of thresholding for glare, and I did see other reports about this. So I think we should do something about it and smooth things out. But this is not really a bug, so this will be handled outside of the bug tracker.

This is due to the harsh thresholding function that the glare node uses. I do agree that this not a great way of thresholding for glare, and I did see other reports about this. So I think we should do something about it and smooth things out. But this is not really a bug, so this will be handled outside of the bug tracker.

Omar Emara closed this issue

2024-02-19 17:10:00 +01:00

Blender Bot added

and removed

labels 2024-02-19 17:10:01 +01:00

Yegor commented

2024-02-19 17:16:30 +01:00

Author

But it doesn't happen to Filmic. So maybe it's a combination of AgX-glare node problem? Increasing threshold negates the whole effect. So it's kind of impossible to get the glow effect with AgX without posterization.
Anyway I addressed it, so you're aware now, even if it's not a bug. Thank you.

But it doesn't happen to Filmic. So maybe it's a combination of AgX-glare node problem? Increasing threshold negates the whole effect. So it's kind of impossible to get the glow effect with AgX without posterization. Anyway I addressed it, so you're aware now, even if it's not a bug. Thank you.

Omar Emara commented

2024-02-19 17:49:46 +01:00

Member

This is most likely coincidental, AgX just makes the effect more apparent. Consider doing manual thresholding with a setup like this meanwhile:

This is most likely coincidental, AgX just makes the effect more apparent. Consider doing manual thresholding with a setup like this meanwhile: ![20240219-182507.png](/attachments/ccaee269-0c07-4d1e-a777-5b8a266f1f8d)

20240219-182507.png

548 KiB

Yegor commented

2024-02-19 17:59:43 +01:00

Author

This may work, I'll test on the production shot, thanks!

This may work, I'll test on the production shot, thanks!

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