Why doesn't the film award have the best color matching award?

Oscar's current screen art effect awards are: photography, visual effects, production designers (partially related); Sound awards include: mixing, sound design, soundtrack, songs (partially related); The color scheme is really a bit special. In the past, the film age may belong to the photography department, but now the digital age may belong to the visual effects department. But to put it bluntly, it is just a decorative work, and its dominant position cannot override photography and visual effects. Just like lighting and onomatopoeia, those secondary departments that belong to the existing awards may suddenly become an award in the future, just like visual effects. That's only when your work and department play a decisive role in both aspects of the film. In fact, most of the photography awards of Pi are awarded to color matching, but the proportion of such works is more or less at present.