I know the most common method is to scan the original movie tape. So that have to exists. But i dont know how much that cost.
It is possible to scan it up to 8k.
After that is done it is a matter of how much digital work one wants to do on them.
Earlier they used to go through the movie frame by frame to clean it up.
Now they let a computer to that. But someone has to watch it see to that it dont clean/remove something that should be there. Like what happen to the shoes in Alice in wonderland.
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