The third Little Pigment is called anthocyanin.
The anthocyanins are responsible for some of the most beautiful of the autumnal colors – reds, purples, and even blues. The fiery red of maple leaves in the fall is due to the anthocyanin cyanidin. That glass of red wine is an aqueous solution of anthocyanin (plus, of course, some other fun stuff like alcohol, fragrances, flavors, and so on).
Anthocyanins are members of an extensive and diverse group of plant chemicals called phenolics. Some phenolics are not themselves colored but act as optical brighteners to enhance the colors of other pigments – as happens, for example, in the glowing golden autumn foliage of the Ginkgo tree. Another phenolic active in senescence is salicylic acid. It seems to have many jobs in plant development and stress response; so many in fact that its pain-relieving properties (in the form of aspirin) are frequently needed by researchers for whom sorting out its functions is a real headache.