i'm currently creating a frontend to use ImageMagick for easy batch-processing to make it easy to use by people who are not familiar with non-gui programs
It's called VRPE (Video Related Picture Editor) and yet can morph and crop frames. It's lacking lots of stuff but the basic usage is there so i decided to release some stable-beta...it needs gtk2 and mplayer to fully work.
If you like, please try it out and give feedback:
http://wiki.hobbyist.de/index.cgi?VRPE
many regards