Years ago, I read a blog entry about a photographer whose style included the "reduction of the complexity of colors" in the portraits that she took. It somewhat involved taking the three primary colors in an image and scaling back one of them until it was essentially two. Obviously, it wasn't just "turning off blue". That would make the image look weird.
It's somewhat difficult to describe objectively what this was like but I made an analogy at the time that if we took it down to one primary color it would essentially be monochrome.
I would think this can be rolled into the term color grading but the technique was quite specific. It also looked very different from split toning.
Does this ring a bell for anyone? Is this a common technique?