Movies were shot on film which is very high quality. (They were shown on giant screens after all). Now that we have modern 4K digital scanners they just go grab the old film strip from a warehouse and scan it digitally.
Old tv programs were not shot on film, but broadcast using a different technology with lower resolution. They may have been recorded on tapes or something similar. So they can’t be rescanned because the original format was already low resolution.
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