I always find this stuff pretty fascinating. When you're watching an old movie, you always know when the scene will end because the quality gets worse before it fades into the next scene. It's interesting to see studio practices though. I think Sony seems to let these look dupey (The Bridge on the River Kwai). I think the major WB restorations will DNR these (see 2001: A Space Odyssey) but I'm not sure about the Warner Archive releases. Paramount DNRs these. It's also curious to see how much of the video is dupey. Is it just for the optical or is it the entirety of the shot? I'm sure there's a lot of history about the technical processes. Such as with the Warner labs in the '50s that led to some really bad opticals for a lot of the run time in Giant and Dial M for Murder.
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