The thread “What happened to glorious Technicolor?” made me think of another movie-related question:
Why were movie posters — the kind you see displayed outside of theaters — still mostly being painted/drawn even into the 1980s? Nowadays they’re almost all photographic, but occasionally I come across pictures of old posters or even just looking at the artwork on VHS/DVD boxes containing older movies, and actual photographs are pretty rare.
Was large-format printing technology so far behind the curve, even into the '80s, that printing photos of that size was impractical/expensive? No easy or practical way to convert photos from movie film stock to a format suitable for printing to paper? Movie posters were the last holdover from stage productions?