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Hi there.
i’ve just been reading through the treads, I’m very interested in preserving films for historical reasons as well as different versions for comparison.
However there is one question as have after reading these threads. Often the HD broadcast of a film will be different from the bluray, having different colours, grain etc. Why is this?
i can understand why this is the case with SD material, that built up over years and as new telecine technology became available or new tape formats, various new copies would be made. As I understand it, TV stations would buy the broadcast tapes and keep them. So one channel would have bought Star Trek tapes on BetaSP tapes in the 80s and have no reason to replace them. While a channel that started airing it in the nineties would have bought Digibeta tapes.
Either way, these tapes and versions built up over decades.
However, aren’t all the HD copies fairly new? I’m not sure about the exact times, but wouldn’t the HD scans have been made ten years ago at most? So why are there so many versions?