Still, the article should have been more careful about terminology, especially in the title. Color is a description of human visual perception, of how a set of

Still, the article should have been more careful about terminology, especially in the title. Color is a description of human visual perception, of how a set of light amplitudes and frequencies is perceived. A photograph displayed on your computer monitor has different frequencies from light given off by the photograph's subject, but it has the same colors. Magenta is definitely a color. What the author meant to say is that magenta can't be a single frequency -- but that title wouldn't have gotten as many clicks.