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Maniphest T57529

Fill brush in texture paint ignores alpha layer
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Description

System Information
Windows 10 64-bit
NVIDIA GeForce GTX 970

Blender Version
Broken: v2.79
Worked: Has not ever worked to my knowledge.

Short description of error
If using the fill bucket on an image with transparency, transparent pixels will be filled in if connected to a not-transparent pixel of similar color that is being filled.

Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
Use the Fill tool in the UV/Image Editor to attempt to make the black ring in the packed image Circle.png a different color.

transparencybug.blend508 KBDownload

Revisions and Commits

rB Blender
rB1b974563b17b Fix T57529: 2D image paint fill tool not taking into account alpha.

Event Timeline

Warp Kaiba (MilesKitaro) created this task.Oct 31 2018, 3:10 AM
Philipp Oeser (lichtwerk) added subscribers: Brecht Van Lommel (brecht), Philipp Oeser (lichtwerk).Nov 1 2018, 11:43 AM

Hm, while this is indeed a little unexpected, it might be more of a feature request [than a real bug]

from the manual:

Fill can be used to fill large areas of the image with the brush color. The tool fills adjacent pixels that have a color value similar to the pixel you clicked on.

so no promise here that it will respect alpha.

@Brecht Van Lommel (brecht): do you think we should keeps this as TODO?

Brecht Van Lommel (brecht) added a comment.Nov 1 2018, 1:07 PM

I would consider this a bug, also because it means the behavior for float (premultiplied) and byte (straight) images is inconsistent. The fix is simple though.

Brecht Van Lommel (brecht) changed the task status from Unknown Status to Resolved by committing rB1b974563b17b: Fix T57529: 2D image paint fill tool not taking into account alpha..Nov 1 2018, 1:07 PM
Brecht Van Lommel (brecht) added a commit: rB1b974563b17b: Fix T57529: 2D image paint fill tool not taking into account alpha..