Killbot said:
http://www.moviepicturedb.com/

Unfortunately you do have to pay but its relatively cheap...

Just search for "Star Wars"

Also quite handy for those making DVD covers (that's how I found it)

There is also the Star Wars Archives forum, which is free.

Btw, Adywan is working from a high-resolution copy of the SE/DVD-version from 2004, which was aired on a HD TV channel in Germany a few years ago. So he has already access to snapshots from the entire movie at 1920x817 (without the black borders)