Saving image with Alpha (like bloom) not saving correctly #81101

New Issue

Pepper · 2020-09-23T18:58:26+02:00

Pepper commented

2020-09-23 18:58:26 +02:00

System Information
Operating system: Windows 10
Graphics card: Radeon 580 Pro

Blender Version
Broken: Latest 2.91 Alpha @ 23 sept

Short description of error
Since the latest Alpha version of Blender. Eevee can now render bloom on transparency. There was a bug yesterday, that got fixed. Now the Viewport is showing the bloom on transparancy, but when saved to a PNGA, it doenst show the bloom anymore.

Exact steps for others to reproduce the error
Render any image on transparency background, with bloom that covers the transparency. Save as a PNG

See Blender File attached

**System Information** Operating system: Windows 10 Graphics card: Radeon 580 Pro **Blender Version** Broken: Latest 2.91 Alpha @ 23 sept **Short description of error** Since the latest Alpha version of Blender. Eevee can now render bloom on transparency. There was a bug yesterday, that got fixed. Now the Viewport is showing the bloom on transparancy, but when saved to a PNGA, it doenst show the bloom anymore. **Exact steps for others to reproduce the error** Render any image on transparency background, with bloom that covers the transparency. Save as a PNG See Blender File attached ![Screenshot_1.png](https://archive.blender.org/developer/F8912512/Screenshot_1.png)

Pepper commented

2020-09-23 18:58:26 +02:00

Added subscriber: @Sankel

Pepper commented

2020-09-23 18:59:05 +02:00

test.blend

Blendfile

[test.blend](https://archive.blender.org/developer/F8912510/test.blend) Blendfile

Philipp Oeser commented

2020-09-24 13:45:43 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-09-24 13:45:43 +02:00

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

Philipp Oeser closed this issue

2020-09-24 13:45:43 +02:00

Philipp Oeser self-assigned this 2020-09-24 13:45:43 +02:00

Philipp Oeser commented

2020-09-24 13:45:43 +02:00

Thx reporting! I believe this is due to PNGs not suited for encoding emission / occlusion / alpha correctly.
Please follow the lengthy discussion in #52680 (Alpha difference Viewport/F12 ) about occlusion vs emission and PNGs.
(While the Image Editor is now fixed to display this all correctly, the discussion about PNGs still holds true)

Workaround here is to use EXRs.

Afraid we have to close this (feel free to comment again though if issues persist).

Thx reporting! I believe this is due to PNGs not suited for encoding emission / occlusion / alpha correctly. Please follow the lengthy discussion in #52680 (Alpha difference Viewport/F12 ) about occlusion vs emission and PNGs. (While the Image Editor is now fixed to display this all correctly, the discussion about PNGs still holds true) Workaround here is to use EXRs. Afraid we have to close this (feel free to comment again though if issues persist).

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Saving image with Alpha (like bloom) not saving correctly #81101