2.8/2.79 Bug: Glare Effect in Compositing Not Working with Transparency in Cycles/Eevee #56343

New Issue

Drew Sikes · 2018-08-13T04:37:06+02:00

Drew Sikes commented

2018-08-13 04:37:06 +02:00

System Information
Windows 10 64-bit, Geforce GTX 970, Intel Core i7-6700k, 16GB Ram
Blender Version
2.80.0
Date: 2018-08-11 18:54
Hash: b4b8d3ab0e
Branch: blender2.8

Short description of error
The Glare effect in Compositing does not work properly in both Cycles and Eevee when using transparency. This issue also exists in 2.79 versions.

Exact steps for others to reproduce the error
Select the render engine of choice, choose PNG for the output with alpha included, enable the Scene's transparency in Film, then render image. lights.blend

**System Information** Windows 10 64-bit, Geforce GTX 970, Intel Core i7-6700k, 16GB Ram **Blender Version** 2.80.0 Date: 2018-08-11 18:54 Hash: b4b8d3ab0e4 Branch: blender2.8 **Short description of error** The Glare effect in Compositing does not work properly in both Cycles and Eevee when using transparency. This issue also exists in 2.79 versions. ![lights_Cycles_normal.png](https://archive.blender.org/developer/F4209280/lights_Cycles_normal.png) ![lights_Cycles_Transparent.png](https://archive.blender.org/developer/F4209286/lights_Cycles_Transparent.png) ![lights_Eevee_normal.png](https://archive.blender.org/developer/F4209227/lights_Eevee_normal.png) ![lights_Eevee_Transparent.png](https://archive.blender.org/developer/F4209233/lights_Eevee_Transparent.png) ![lights_Compositing.png](https://archive.blender.org/developer/F4209347/lights_Compositing.png) ![lights_2.79.png](https://archive.blender.org/developer/F4209540/lights_2.79.png) **Exact steps for others to reproduce the error** Select the render engine of choice, choose PNG for the output with alpha included, enable the Scene's transparency in Film, then render image. [lights.blend](https://archive.blender.org/developer/F4209202/lights.blend)

Drew Sikes commented

2018-08-13 04:37:06 +02:00

Added subscriber: @DTStheTDS

blender-admin commented

2018-08-13 04:37:06 +02:00

#72014 was marked as duplicate of this issue

Bastien Montagne commented

2018-08-13 11:33:38 +02:00

Added subscribers: @Jeroen-Bakker, @mont29

Jeroen Bakker was assigned by Bastien Montagne

2018-08-13 11:33:39 +02:00

Bastien Montagne commented

2018-08-13 11:33:39 +02:00

I guess that’s something to do with premultiplied/straight alpha, @Jeroen-Bakker care to check? Thanks.

Drew Sikes commented

2018-08-13 12:36:59 +02:00

It might have something to do with it. This was pretty much the closest workaround solution I came up with, even then there's still some compromise. Is it a compositor/viewport problem or is this just normal for some effects in Blender? Sorry, I'm still fairly new to Blender.

It might have something to do with it. This was pretty much the closest workaround solution I came up with, even then there's still some compromise. Is it a compositor/viewport problem or is this just normal for some effects in Blender? Sorry, I'm still fairly new to Blender. ![lights_tempfix.png](https://archive.blender.org/developer/F4212992/lights_tempfix.png)

Brecht Van Lommel commented

2018-08-13 16:27:24 +02:00

Closed as duplicate of #52680

Brecht Van Lommel closed this issue

2018-08-13 16:27:24 +02:00

Brecht Van Lommel commented

2018-08-13 16:28:22 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2018-08-13 16:28:22 +02:00

The compositor actually works fine, but the image editor is not displaying it correctly, see #52680.

If you composite the result over another image or save as OpenEXR it should work fine.

The compositor actually works fine, but the image editor is not displaying it correctly, see #52680. If you composite the result over another image or save as OpenEXR it should work fine.

Yevgeny Makarov commented

2018-08-13 16:50:29 +02:00

Added subscriber: @jenkm

Yevgeny Makarov commented

2018-08-13 16:50:29 +02:00

@brecht

The problem lies elsewhere.

The render has zero alpha, outside the object.
After the Glare effect it remains zero.

That is, the Glare node does not take into account transparency.

@brecht The problem lies elsewhere. The render has zero alpha, outside the object. After the Glare effect it remains zero. That is, the Glare node does not take into account transparency.

Brecht Van Lommel commented

2018-08-13 17:08:21 +02:00

The fact that is has zero alpha outside the object is correct, it's intended to add glow without obscuring anything behind.

Philipp Oeser commented

2019-11-29 11:33:58 +01:00

Added subscribers: @Brelidav, @lichtwerk

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2.8/2.79 Bug: Glare Effect in Compositing Not Working with Transparency in Cycles/Eevee #56343