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Bug 752819 - pictures without background: later pdf export introduces artifacts on edges where there is no background
pictures without background: later pdf export introduces artifacts on edges w...
Product: GIMP
Classification: Other
Component: General
Other All
: Normal normal
: ---
Assigned To: GIMP Bugs
Depends on:
Reported: 2015-07-24 10:32 UTC by Wamseln
Modified: 2015-07-25 06:12 UTC
See Also:
GNOME target: ---
GNOME version: ---

Description Wamseln 2015-07-24 10:32:43 UTC
When I create a picture in GIMP with parts of it being without background (does not matter whether xcf or png or else) and then export it to pdf (it does not matter if I use GIMP for this or LaTeX for example), I get gray fringes around the borders of the parts where there is no background. 

For  and example, please see this link:
Comment 1 Joao S. O. Bueno 2015-07-25 05:57:16 UTC
The weird alpha artifacts are probably due to a Cairo bug when copying the layer buffer with alpha information; 

It is not noticeable if the alpha is feathered and does not exist if transparency information comes from a layer mask, instead of the alpha channel (but this transparency is applied with a different Cairo call)

I could reproduce the problem with Cairo 1.14.2 on a Linux64

Most likely this should be opened as a Cairo bug.
Comment 2 Joao S. O. Bueno 2015-07-25 06:12:24 UTC
Well, it is actually already reported there: