system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is a film that is filmed at a certain resolution remastered to 1080p/blu-ray?

I feel like this is an odd question but I was curious as to how its done because you can't really re-render the film at a higher resolution without losing quality.
gpt
Because film is/was much higher "resolution" than digital, we just never had a way to display it before. Now that we have HD televisions and monitors, and Blu-Ray, they can re-scan the original film negatives (assuming they still have them) and get the newer versions.