I wonder if the reason Sponge Bob or Bart Simpson have yellow faces doesn’t have more to do with CMYK than with the RGB solution this video suggests. Of course lots of modern cartoon characters have been developed for TV but the conventions may have been established before that in newspapers and comics, where absorbent papers demanded large screens and spot colors, subtractive rather than additive color.

Still, this is interesting. Maybe yellow does stand out against a blue background being complementary on the RGB color wheel. But just because the sky is blue doesn’t have to mean it’s the constant background color in a cartoon. What about green grass? Wouldn’t complementarity make us want the faces to be magenta?

I just bet the convention predates television, so that the explanation is rather more ink-based.

Link thanks to David Crotty at The Scholarly Kitchen.