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Bug 573703 - Merging layers looses opacity
Merging layers looses opacity
Status: RESOLVED DUPLICATE of bug 691579
Product: GIMP
Classification: Other
Component: General
2.6.4
Other All
: Normal normal
: ---
Assigned To: GIMP Bugs
GIMP Bugs
Depends on:
Blocks:
 
 
Reported: 2009-03-02 04:34 UTC by Tim Graupmann
Modified: 2013-04-02 06:18 UTC
See Also:
GNOME target: ---
GNOME version: ---


Attachments
XCF file linked to in previous comment. (100.83 KB, application/octet-stream)
2009-03-03 17:42 UTC, Michael Schumacher
Details

Description Tim Graupmann 2009-03-02 04:34:25 UTC
Please describe the problem:
You can apply an alpha mask to a layer to paint the opacity. When you apply the layer mask the opacity is set. However, when the layer is merged with another layer, the opacity is lost.

Steps to reproduce:
1. Merge a layer with an alpha mask with another transparent layer.
2. Merge two layers with alpha masks
3. Merge two layers with applied alpha masks


Actual results:
The opacity changes to zero

Expected results:
The opacity value should be added together

Does this happen every time?
Happens every time

Other information:
Comment 1 Sven Neumann 2009-03-02 06:52:26 UTC
Please provide a small XCF file that illustrates the problem.
Comment 2 Michael Schumacher 2009-03-02 16:00:42 UTC
... and do describe what exactly you're doing.
Comment 3 Tim Graupmann 2009-03-02 23:36:23 UTC
Here is a video that I recorded on how to merge the layers will maintaining the RGB values for opaque pixels.

http://screencast.com/t/pK1oCgfB
Comment 4 Michael Schumacher 2009-03-03 09:35:22 UTC
Nice. And now please describe what you did and why the result you got is not what you did expect to get.
Comment 5 Michael Schumacher 2009-03-03 10:44:57 UTC
I can't reproduce this in any possible way - the display does stay the same.
Comment 6 Sven Neumann 2009-03-03 14:44:05 UTC
I asked for an XCF file, not a video. Please provide the XCF file we asked for.
Comment 7 Tim Graupmann 2009-03-03 16:35:54 UTC
I just couldn't figure out how to attach the image. Here:

http:///tagenigma.com/qa/Unity3d/Textures/gimp_alpha_bug.xcf

Use the video for directions on how to reproduce if you can follow.
Comment 8 Michael Schumacher 2009-03-03 17:42:36 UTC
Created attachment 129955 [details]
XCF file linked to in previous comment.

Use the "Create a New Attachment" link to add files.
Comment 9 Michael Schumacher 2013-03-30 23:16:10 UTC
Might be the same problem as bug 691579.
Comment 10 Michael Natterer 2013-04-02 06:18:38 UTC
Yes iz is the same. We technically can't preserve the color values
of transparent pixels across a merge layers operation.

*** This bug has been marked as a duplicate of bug 691579 ***