system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do they make high definition versions of old tv shows and movies?

Is it all photoshopped or is there a way to extract more information from the recordings?

Thanks to everyone for the explanations...   I completely had the wrong end of the stick!
gpt
They used cameras that have film reels, which has a very large resolution. They take the strips of film, they put it into a scanning machine that scans the movie or tv show frame by frame at an hd resolution. This allows the film to be in a digital format, and can go through programs that can correct any imperfections in the film. This is how they make old movies into Blurays.