Gimp
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What Gimp cannot do
Gimp lacks some simple functions like adding pillars, shapes and other little graphics that you might need.
Use xara, scribus, dia or openoffice draw to add such features. You'll easy install them with ubuntu out of the box, or use automatix.
Each of this program is designed for publishing, so they will produce letter size output, e.g. for letters or catalogs. Each of them uses its own file storage format.
That's why you have to use the import features to use your gimp edited e.g. png graphic and the export feature to get a png picture again.
Round Edges with background shadow
ScriptFu -> Decoration
- Script Fu -> Shadow -> Shadowed
Selection -> Rounded rectangle
- Selection ->Invert selection
- Selection -> Cut