How can films be re-released later in a higher resolution?

Question

I can understand how movies can be released at higher resolutions a short time after original release, like a couple years. But I’ve seen some movies get released a whole decade later in *MUCH* higher quality than the original release. Like, how does something released in the 90’s or 2000’s get a 4k UltraHD release now?

In: Technology

Answer 1

They just re-scan the physical tapes with each frame on them with a scanner that scans at a 4K resolution.