Workbench Transparent Film Anti-Aliasing White Contour #69930

New Issue

Sam · 2019-09-16T09:35:24+02:00

Sam commented

2019-09-16 09:35:24 +02:00

{F7750460}System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.35

Blender Version
Broken: version: 2.81 (sub 11), branch: master, commit date: 2019-09-15 18:34, hash: b043bef000
Worked: (optional)

Short description of error
Workbench transparent film render adds a weird semi-transparent white contour on edges of alpha channel, if background isn't 100% black, and Anti-aliasing enabled.

Exact steps for others to reproduce the error

For startup file

Choose workbench engine, enable transparent film.
Render with transparent background.
In render workspace choose "Color" instead of "Color and Alpha" to see problem clearly.

For example file:

Press F12 for render

[Based on the default startup or an attached .blend file (as simple as possible)]

{[F7750460](https://archive.blender.org/developer/F7750460/example.blend)}**System Information** Operating system: Windows-10-10.0.17763 64 Bits Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.35 **Blender Version** Broken: version: 2.81 (sub 11), branch: master, commit date: 2019-09-15 18:34, hash: `b043bef000` Worked: (optional) **Short description of error** Workbench transparent film render adds a weird semi-transparent white contour on edges of alpha channel, if background isn't 100% black, and Anti-aliasing enabled. **Exact steps for others to reproduce the error** 1) For startup file - Choose workbench engine, enable transparent film. - Render with transparent background. - In render workspace choose "Color" instead of "Color and Alpha" to see problem clearly. 2) For example file: - Press F12 for render [Based on the default startup or an attached .blend file (as simple as possible)] ![image.png](https://archive.blender.org/developer/F7750386/image.png)

Sam commented

2019-09-16 09:35:24 +02:00

Added subscriber: @NinKorr

Sam changed title from ~~Workbench Transparent Film Contour~~ to Workbench Transparent Film Anti-Aliasing White Contour

2019-09-16 09:48:43 +02:00

Germano Cavalcante commented

2019-09-30 15:56:16 +02:00

Added subscribers: @Jeroen-Bakker, @mano-wii

Jeroen Bakker was assigned by Germano Cavalcante

2019-09-30 15:56:16 +02:00

Germano Cavalcante commented

2019-09-30 15:56:16 +02:00

@Jeroen-Bakker, is this a known limitation of workbench rendering?

Jeroen Bakker commented

2019-09-30 16:49:28 +02:00

Seems like we need to finetune this.
Workbench was never designed to be a renderer, so we were able to hide some of these artifacts. But I agree we should check what is causing this and find a solution.

Seems like we need to finetune this. Workbench was never designed to be a renderer, so we were able to hide some of these artifacts. But I agree we should check what is causing this and find a solution.

Jeroen Bakker commented

2019-10-01 09:41:29 +02:00

Ah, Seems like a display issue. The color values are correct, but seems like that when displaying the buffer is set or assumed to be pre-multiplied, but in fact workbench outputs straight alpha.
This makes all alpha values other than 1.0 and 0.0 displayed incorrectly.

Ah, Seems like a display issue. The color values are correct, but seems like that when displaying the buffer is set or assumed to be pre-multiplied, but in fact workbench outputs straight alpha. This makes all alpha values other than 1.0 and 0.0 displayed incorrectly. ![image.png](https://archive.blender.org/developer/F7783243/image.png)

Sam commented

2019-10-01 20:19:09 +02:00

I just realised... Is it compositor bug?
Looks like non-monochrome alpha breaks even Eevee renders. Alpha from other image/view layer breaks color data, same glitch. Outline stays here after export. Same mixing in other software gives correct result.

I just realised... Is it compositor bug? Looks like non-monochrome alpha breaks even Eevee renders. Alpha from other image/view layer breaks color data, same glitch. Outline stays here after export. Same mixing in other software gives correct result. ![image.png](https://archive.blender.org/developer/F7783839/image.png)

Jeroen Bakker was unassigned by Dalai Felinto

2019-12-23 13:50:36 +01:00

Clément Foucault commented

2020-01-17 20:44:59 +01:00

Added subscriber: @fclem

Clément Foucault commented

2020-01-17 20:44:59 +01:00

This is a viewer bug. Not a bug in workbench.

Clément Foucault commented

2020-01-17 20:45:07 +01:00

Closed as duplicate of #52680

Clément Foucault closed this issue

2020-01-17 20:45:07 +01:00

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Workbench Transparent Film Anti-Aliasing White Contour #69930