Why is that in some animation styles things that are animated are brighter than the static background?

Question

As an example here’s a clip.

劇場アニメ『老人Z』（1991年公開）は沖浦啓之、黄瀬和哉、井上俊之、本田雄、松本憲生、磯光雄、森本晃司、福島敦子、今敏、森田宏幸、中澤一登、鶴巻和哉、飯田史雄、平松禎史など錚々たるアニメーターが参加している点も見どころで、特に沖浦さんが作画したこのシーンは何度観ても素晴らしい！ pic.twitter.com/UseSMawBLd

— タイプ・あ～る (@hitasuraeiga) March 8, 2020

At 20s you can clearly see what the background is and what are all the animated bits.

In: Technology

Answer 1

I noticed this rewatching a nineties cartoon called Gargoyles. Basically fixed background pieces were a different colour. So facing 10 bookshelves, one is a bit brighter than the others, and that was always the one that would fall. Sane with statues, walk sections, etc…

I wager it’s because the other background is static so it was animated 1 time. The bookshelf that falls is a seperate piece of the background and has been animated hundreds of times, in an era before colour correction technology was fast and cheap it was probably just easier to ignore, figuring old TVs and the size made it difficultfor a viewer to notice.