Most of the fine details in Cagliostro (the moss on the castle walls, the weave of Lupin’s red jacket) exist in the mid-frequency spectrum. 720p captures 921,600 pixels per frame. For an animated film with limited color palettes and no CGI textures, that is objectively enough pixels to reconstruct every line the animators drew. Pushing beyond that reveals empty resolution—pixels that are just guessing what color a blank wall should be.
: The most recent high-end release is a native 4K (2160p) remaster. 1080p Full HD lupin iii castle of cagliostro 720p resolution