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I'm trying to use this render as an overlay on an image in Photoshop. I tested blend modes in photoshop, but didn't get the result I was looking for. When I set the alpha to transparency in the scene settings it just rendered the object but not the bloom.

This is the expected result but the black would be transparent:

enter image description here

When I do set the alpha to transparent I get this w/o the bloom:

enter image description here

Right now it isn't possible to render bloom on a transparent background, because the render results use premultiplied alpha.

So, what are some other methods of creating bloom on a transparent background that doesn't involve compositing in blender. I don't care what program I have to use to solve this problem.

Thanks.

altheconda
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    Save the image as OpenEXR read: https://blender.stackexchange.com/questions/67789/render-halo-material-with-tranparent-background/67792#67792 and https://blender.stackexchange.com/questions/34002/glow-effect-invisible-on-transparent-background/44137#44137 and: https://blender.stackexchange.com/questions/42939/rendering-fire-animations-with-transparent-background/44148#44148 –  Jan 10 '19 at 00:57
  • https://blender.stackexchange.com/questions/57816/how-do-i-get-the-glare-node-to-output-transparent-instead-of-black-background/57824#57824 –  Jan 10 '19 at 01:00
  • This tutorial may help.Try using two different scenes for bloom and transparency respectively. Tutorial to get bloom with transparency – Soumya Gochhayat Dec 27 '19 at 06:15
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    Use Fusion, Nuke, Resolve, Affinity, or even Krita. The problem is that Photoshop isn’t handling alpha correctly, while other software does. Affinity and Krita use some hacks, but it almost works. https://twitter.com/jkierbel/status/1210355168249876480?s=21 – troy_s Dec 27 '19 at 16:24
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    And of course, Blender’s viewer is broken, and has been since its inception. – troy_s Dec 27 '19 at 16:26

1 Answers1

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I have tested many different combinations.

The best way to achieve it is to use post compositing. enter image description here

With cycle follow the node setup with red arrows.

I also tried EEVEE, there is a BloomCol pass that you can check, but this pass does not have tranparency, so using this or doing an alphaover node would kill your transparency. It does look fancier out of box. enter image description here but for transparency I think cycles is easier.

I am sorry if it looks messy, as I just figured it out, so I do not want to destroy my node setup.

Sean
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