Maniphest T39784

Blur bug
Closed, Archived
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Assigned To
Sergey Sharybin (sergey)
Authored By
lopata (lopataasdf)
Apr 18 2014, 9:06 PM
Tags
  • BF Blender
Subscribers
lopata (lopataasdf)
Sergey Sharybin (sergey)
Willi (willi)

Description

win7 x64

blender-2.70-9b60174-win64-vc12

blur_bug.blend534 KBDownload

When the image has a alpha channel and transparent backround is not black, blur does not work correct

Event Timeline

lopata (lopataasdf) created this task.Apr 18 2014, 9:06 PM
lopata (lopataasdf) raised the priority of this task from to 90.
lopata (lopataasdf) updated the task description.
lopata (lopataasdf) added a project: BF Blender.
lopata (lopataasdf) edited a custom field.
lopata (lopataasdf) added a subscriber: lopata (lopataasdf).
Willi (willi) added a subscriber: Willi (willi).EditedApr 18 2014, 11:29 PM

EDIT: comment deleted.

Sergey Sharybin (sergey) changed the task status from Unknown Status to Archived.Apr 21 2014, 9:47 AM
Sergey Sharybin (sergey) claimed this task.

That's not a bug, but a misconfigured node setup. Compositor is expected to work in scene linear color space with premultiplied alpha. It is possible to screw this assumption (sometimes you need to do this on purpose) in some cases. And your setup is one of this case: setting the alpha channel would result in straight alpha, so what you need to do is to add an Alpha Convert node after the Set Alpha node and convert Straight to Premul.

Not a bug and nothing to fix here,