I've seen the Earl's Court show and the Nassau Coliseum show from that 1980 tour, both on VHS and online. The picture quality was about the same and I think the only copies out there are the bootlegged ones. Supposedly, Roger Waters has the original footage and won't release it because he thinks it's not good enough for a commercial release.
Here's a link to a download for the Earl's Court show...
T.U.B.E.: Pink Floyd - 1980-08-09 - Earl's Court (2xDVDfull pro-shot)
Click on the show title and it will take you to the guitars101 forum where the links are.
It's been uploaded to several different file hosting sites. Some of the links are dead but the filefactory links are still active. I haven't downloaded the show yet, so I don't know if the picture quality will be any better than what's already on YouTube.