Maniphest T87731

Image with Alpha not exported properly with emissive materials on transparent background
Closed, Duplicate
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Assigned To
None
Authored By
Monaime (Monaime)
Apr 22 2021, 10:37 PM
Tags
  • BF Blender
Subscribers
Monaime (Monaime)
Philipp Oeser (lichtwerk)

Description

System Information
Operating system: Windows 7 64 bit
Graphics card: nvidia geforce GTX 1080

Blender Version
Broken: 2.92.0, Hash: 02948a2cab44

Short description of error
When the world background is transparent, and the bloom effect is enabled, rendering an emissive material works as expected, but when saving the render result the saved image is not correct ("PNG" and "TIFF" formats) the openEXR format works fine.

But if i change the alpha to "None" The color information is actually there.

Exact steps for others to reproduce the error

  • Open the attached blend file.
  • Render (F12).
  • Save the image, PNG with RGBA.
  • Open the saved image. It doesn't look like the rendered image.

Alpha Bug.blend834 KBDownload

Related Objects

Event Timeline

Monaime (Monaime) created this task.Apr 22 2021, 10:37 PM
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).May 11 2021, 5:56 PM

Although it seems generally a bad idea to use PNGs with alpha for emmisive colors, we still have T81199: Some effects [bloom, smoke, fire, ..] still don't save in PNG with transparent background (occlusion vs. emission) open for this, will merge these reports

Philipp Oeser (lichtwerk) closed this task as a duplicate of T81199: Some effects [bloom, smoke, fire, ..] still don't save in PNG with transparent background (occlusion vs. emission).May 11 2021, 5:56 PM