Image viewer shows colour banding when the denoise node is used. #77296

New Issue

michael campbell · 2020-06-03T08:55:04+02:00

michael campbell commented

2020-06-03 08:55:04 +02:00

Bisecting the issue shows a1f9eebc0b as the cause for this issue.

This issue also doesn't seem to be confined to the denoise node. It also occurs when using texture baking.

System Information
Operating system: Windows-10-10.0.17763-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.92

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-02 22:21, hash: 2e52b3206c
Worked: (newest version of Blender that worked as expected)

Short description of error
image viewer appears to be in 8 bit if a denoise node is used only. Even if the denoise node is used, the backdrop in the compositor stays at full quality without 8 bit banding.

Exact steps for others to reproduce the error

Create a scene where a significant gradient occurs in Cycles.
In the compositor add a denoise node between the render layer and the compositor output.
Render that scene.
Now if you look at the "render results" in the "image view" editor, you'll notice bad colour banding.

Here's a .blend file that does step 1 and 2 for you.
#77296 - Denoising banding.blend

Edit by @Alaska Bisecting the issue shows a1f9eebc0b as the cause for this issue. This issue also doesn't seem to be confined to the denoise node. It also occurs when using texture baking. --- **System Information** Operating system: Windows-10-10.0.17763-SP0 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.92 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-02 22:21, hash: `2e52b3206c` Worked: (newest version of Blender that worked as expected) **Short description of error** image viewer appears to be in 8 bit if a denoise node is used only. Even if the denoise node is used, the backdrop in the compositor stays at full quality without 8 bit banding. **Exact steps for others to reproduce the error** 1. Create a scene where a significant gradient occurs in Cycles. 2. In the compositor add a denoise node between the render layer and the compositor output. 3. Render that scene. 4. Now if you look at the "render results" in the "image view" editor, you'll notice bad colour banding. Here's a .blend file that does step 1 and 2 for you. [#77296 - Denoising banding.blend](https://archive.blender.org/developer/F8573718/T77296_-_Denoising_banding.blend) ![image.png](https://archive.blender.org/developer/F8573652/image.png)

michael campbell commented

2020-06-03 08:55:04 +02:00

Added subscriber: @3di

michael campbell changed title from ~~image viewer appears to be in 8 bit~~ to image viewer appears to be in 8 bit if a denoise node is used between the image and the composite output or viewer node, looks fine in the comp backdrop.

2020-06-03 09:03:45 +02:00

Alaska commented

2020-06-03 10:00:19 +02:00

Added subscriber: @Alaska

Alaska commented

2020-06-03 10:00:19 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Alaska commented

2020-06-03 10:00:19 +02:00

Am able to confirm. Only appears to affect 2.90.0. Will bisect Blender to find the cause.

Will also add a .blend file to the report.

Am able to confirm. Only appears to affect 2.90.0. Will bisect Blender to find the cause. Will also add a .blend file to the report.

Alaska commented

2020-06-03 10:17:23 +02:00

Bisecting Blender shows a1f9eebc0b as the cause.

Bisecting Blender shows a1f9eebc0b as the cause.

Alaska changed title from ~~image viewer appears to be in 8 bit if a denoise node is used between the image and the composite output or viewer node, looks fine in the comp backdrop.~~ to Image viewer shows colour banding when the denoise node is used.

2020-06-03 10:18:15 +02:00

Evan Wilson commented

2020-06-03 14:46:51 +02:00

Added subscribers: @fclem, @EAW

Evan Wilson commented

2020-06-03 14:46:51 +02:00

In #77296#943368, @Alaska wrote:
Bisecting Blender shows a1f9eebc0b as the cause.

Paging @fclem

> In #77296#943368, @Alaska wrote: > Bisecting Blender shows a1f9eebc0b as the cause. Paging @fclem

Clément Foucault commented

2020-06-03 20:12:57 +02:00

should already be fix. can someone test again?

michael campbell commented

2020-06-03 20:17:06 +02:00

It was fine in the build from 1st june, but not in the 3rd june build.

Arie Leo commented

2020-06-03 20:47:49 +02:00

Added subscriber: @reanimate

Arie Leo commented

2020-06-03 20:47:49 +02:00

Just want to add some info about this issue since i'm also having color banding on image viewer. I don't think this was caused by denoise node, since i'm also having colour banding without that node.
From what i found, :

Colour Banding occurred on every colour view transform except Raw.
Colour Banding occurred when ImageDisplay Method are using GLSL, setting it to automatic seems choose GLSL method.

also for some reason GLSL method also slow down the image viewer (i'm getting lag when panning/zooming on image viewer),
GLSL method also reduce blender perfomance on 2D drawing method and windows compositor ie. put blender on windowed mode and try to drag blender around or any blender windows
Workaround i can find is changing the image display method to 2DTexture

It removed the Colour Banding issue, and fix the performance issue with the image viewer and windows drawing.

Just want to add some info about this issue since i'm also having color banding on image viewer. I don't think this was caused by denoise node, since i'm also having colour banding without that node. From what i found, : - Colour Banding occurred on every colour view transform except Raw. ![image.png](https://archive.blender.org/developer/F8574745/image.png) - Colour Banding occurred when ImageDisplay Method are using GLSL, setting it to automatic seems choose GLSL method. ![image.png](https://archive.blender.org/developer/F8574750/image.png) also for some reason GLSL method also slow down the image viewer (i'm getting lag when panning/zooming on image viewer), GLSL method also reduce blender perfomance on 2D drawing method and windows compositor ie. put blender on windowed mode and try to drag blender around or any blender windows - Workaround i can find is changing the image display method to 2DTexture ![image.png](https://archive.blender.org/developer/F8574755/image.png) It removed the Colour Banding issue, and fix the performance issue with the image viewer and windows drawing.

Clément Foucault commented

2020-06-03 20:52:04 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Clément Foucault closed this issue

2020-06-03 20:52:04 +02:00

Clément Foucault self-assigned this 2020-06-03 20:52:04 +02:00

Clément Foucault commented

2020-06-03 20:52:04 +02:00

Sorry I meant to test latest Git revision as the buildbot version is still not updated (will be tomorrow).

This is likely fixed by 96eab08755 so closing. If not fixed in tomorrow's build, you can reopen.

Sorry I meant to test latest Git revision as the buildbot version is still not updated (will be tomorrow). This is likely fixed by 96eab08755 so closing. If not fixed in tomorrow's build, you can reopen.

Alaska commented

2020-06-04 00:19:57 +02:00

Testing with 2.90.0 Alpha, branch: master, commit date: 2020-06-03 18:45, hash: b94ab93dfb shows it as resolved. Thanks @fclem

Testing with 2.90.0 Alpha, branch: master, commit date: 2020-06-03 18:45, hash: `b94ab93dfb` shows it as resolved. Thanks @fclem

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Image viewer shows colour banding when the denoise node is used. #77296