system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how older movies are released in Blu Ray versions

I just don't understand how older movies (for example The Sandlot to cite a commercial I just saw) can be edited and have the quality improved to such a better version, without physically reshooting the movie with a higher quality camera.
gpt
the original footage was at least as good as blu ray quality.  But DVDs couldn't support the quality of the initial film.  Blu Ray is much closer to the initial footage.  This is why videos in the movie theater looked MUCH better then DVDs, they were actually more like Blu Ray quality (or better).