Final answer:
Color constancy is the ability of the eye-brain system to discern the true color of an object. The retinex theory of color vision explains color constancy by postulating the existence of three retinexes or image systems.
Step-by-step explanation:
Color constancy is the ability of the eye-brain system to discern the true color of an object illuminated by various light sources. The retinex theory of color vision explains color constancy by postulating the existence of three retinexes or image systems, associated with the three types of cones that are compared to obtain sophisticated information.