[FearNotDaniel]

> just

Unfortunately there's a lot of post-production steps that take place between the original film and the finished show. Since the 90s/noughties many of those steps take place in digital systems after the film has been scanned at the chosen resolution. Here's some detail specific to Babylon 5 and HD conversion, for example:

https://www.engadget.com/2018-06-22-babylon-5-digital-video-...

[therealcamino]

Oh, yeah, I'm sure it's more complicated than I made it sound, especially if you had early CGI added later like Babylon 5. What I wanted to convey was that the source material for many programs had much higher resolution than the original NTSC broadcast or VHS versions, and that's what makes it possible to produce an HD version of a show that was filmed before HD was invented.