zombie84 said:

But the Star Wars IPs look really, really bad, especially the first few reels of Star Wars. An interpositive just shouldn't look that bad, especially since it was only run a couple times, since it was created in 1985 for home video.

Zombie, were comes this information from that the IPs was first created in 1985? Just curious.

Some interesting info from THX Technical Supervisor Dave Schnuelle regarding the process of making the Definitive Collection Laserdiscs In the September 1993 issue of Widescreen Review:

"In this case, for all three films, we used interpositive elements that had been made directly from the camera negative. Other film transfers might be done from internegatives made from the interpositive, or from low-contrast prints, but we preferred the IP's for these transfers, because that's the earliest generation usable"

"One small difference from the original films is that in letterbox transfers we prefer to put any subtitles in the black border beneath the actual picture area. Thus we didn't use the same interpositive as the theatrical one, because that one contains subtitling already. In tracking down the elements, we found that the only ones in the vault were ones with subtitles- these clearly weren't the first generation off the camera neg because they had to have the subtitles burned in. So a massive search was undertaken and the first generation IP's were found in a special vault having only opticals in Los Angeles."

"A Mark IIIC with a 4:2:2 digital output [telecine] was used."

"[We used] a noise reduction and dirt concealment device made by Digital Vision, a company in Sweden. Their DVNR-1000 is a very powerful noise reducer for reducing film grain. Especially on the two earlier movies the film grain was very high."