How can movies from 70s be remastered in 4K, but not sports games?

Question

For example, they remastered Taxi Driver from 1976 to 4K Quality, but they can’t remaster Lakers vs Celtics from the 80s?

In: Technology

Answer 1

If it was shot on video it can’t be made bigger without quality loss. If it was shot on 35mm film and the negatives are still around and in good quality they can be scanned at 4k because film has a very high resolution.