Fun fact:
OKLab which was created recently by Björn Ottosson as a hobby project, is a pretty accurate perceptual colorspace. It is open Source and has been adapted by Photoshop for Black and White conversion.
I kinda hope painting apps will also impliment it as a standard model for colopickers.
I’m an Illustrator. And I even contributed something non software engineery.
Okay, I’m pretty late to the party, but here we go. My field is illustration and art, and especially color theory is something that a lot too often is teached plainly wrong. I think it was in the 1950s when Johannes Itten introduced his book on colortheory. In this book, he states that there are three “Grundfarben” (base colors) that will mix into every color. He explained this model with a color ring that you will still find almost anywhere. This model and the fact that there are three Grundfarben is wrong.
There are different angles from where you can approach color mixing in art, and it always depends on what you want to do. When we speak about colors, we actually mean the experience that we humans have, when light rays fall into our eyes. So, it’s actually a perceptual phenomenon, which means it is actually something that has small statistical differences from individual to individual. For example, a greenish blue might be a little bit more green for one person or a little more blue for the other.
Every color, however, has its opposite color. Everybody can test this. Look into a red (not too bright) light for some time and then onto a white wall. The color you will see is the opposite. They will cancel each other out and become white / neutral.
Ittens colormodel, however, is not based in perception. In this model yellow is opposed to violet, which might mix to a neutral color with pigments but not with lightrays. But even that doesn’t work a lot of times. I mean, even his book is printed in six colors, even though his three basecolors are supposedly enough to print every color…
In history lot of colormodels have been less correct course. What is so infuriating is that in Ittens case, he just plainly ignored the correct colortheory that already existed (by Albert Henry Munsell) and created his own with whatever rules that he believes are correct.
Even today, this model and rules are teached at art schools and you can see his color circle plastered all over the internet.
Tldr: Johannes Ittens colormodel is wrong, even though it’s almost everywhere.
(Added tldr)
Itten
Munsell
The colormodel of munsell, for example, takes into account that some light waves have the same energy, they are experienced in a different brightness. >Helmholz-Kohlrausch effect
The Color model is dependent on what you want to do with it but in Ittens case, it doesn’t even help with pigment mixing nor as a perceptual representation.