Well, ImageMagick is just a bitmap editing script like language. It does not have a GUI or anything but you can edit up a text file with lables, rotations, color, positions for it etc and then get it to render out a bitmap with those lables all done in the right place. If you want to change it then edit the text file, run the script again and take the new image with all the lables on. It can composite those in or you can make the image of just the lables and composite it in with some other app which is how I did it.