http://kidsquid.com/files/starwars/rotj/
For those curious, I use Ubuntu Linux, here is my capturing method:
1) mplayer dvd://3 -vo x11 -alang en -chapter 1 -framedrop -noaspect
2) pause and frame advance as desired
3) capture window, crop, and save as PNG with The Gimp
I ran out of time this morning, but I'll do more later.
Enjoy!