A successive, asymmetric color-matching paradigm was used to
investigate the link between cone contrast and the stability of perceived
colors. We measured the perceived color shifts of 10 Munsell samples,
induced by test illuminant A, simulated in u′v′ color space.
The capacity of the visual system to resist these shifts, otherwise known
as color constancy, is measured in terms of the Brunswik ratio, BR. Cone
contrasts are calculated with respect to either the physical or perceived
background. Subjective cone contrasts show a better fit to the von Kries
law than those based on the physical background. Complete cone adaptation
occurs when color constancy is high. However we show conditions where cone
adaptation seems complete but color constancy is poor.