GNOME Bugzilla – Bug 752819
pictures without background: later pdf export introduces artifacts on edges where there is no background
Last modified: 2015-07-25 06:12:24 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:
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.
Well, it is actually already reported there: