There are a lot of ROTJ shots on this page. Not sure if DJ did more post-processing to them, but he used the GKAR as a base for Jedi, and the Flunk as a base for Empire and ANH.
I think there are some caps of the Flunk ANH earlier in the thread, but I know the caps in the first page or two (or three) are all laserdisc caps, none of which were used in the final discs.