What's the easiest way to add Callouts to an image given the capabilities of a default Ubuntu 12.04?
I've got Gimp 2.6 already present (although I am not suggesting it is present in a default Ubuntu) and I find the instructions for adding a Callout via Gimp to be tedious. There is something called Gimp Dynamic Text plugin but I've read that it's very old and so unlikely to work in 2.6 and you probably have to compile C files to get it to work; so it could be messy and still may be a bad cost-benefit prospect.
If the answer does not involve Gimp, that would be welcome.