movies were shot on film so it’s just a matter of scanning the film at a higher resolution
video games are a little different, you can easily adapt a game to run at a higher resolution, but if the textures are low quality you are going to notice, so you usually need to remaster all the textures to a higher resolution so it actually looks good, as well as the 3D models so they look adequate in a higher resolution image rather than straight polygons
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