For example, iMovie themes have drop zones where you can drag and drop pictures from your iPhoto albums. However, you may soon discover that these linked photos get rendered as completely white rectangles. The easiest solution I found was to edit that picture in iPhoto. Even just a tiny bit of editing (or a simple rotation) will do, as iPhoto then saves a real copy of the edited version in its Modified folder. Now, when you use the photo (which looks almost the same when viewed through an album) in your iMovie theme, it will work fine.
Hopefully you will use only a few pictures for these themes, so replicating them does not defeat the purpose of linking to them instead of copying.

