Abstract

The color appearance of a surface is influenced by the chromatic proper ties of the lights from neighboring surfaces. We studied the influence of surround contrast by modulating sinusoidally the contrast of a surround and determining how much nulling contrast modulation was required to make a central test appear steady^1,2—a direct measurement of color constancy. We used spatial noise patterns for the surround and central test; these were either achromatic or isoluminant, lying along either the constant B or along the constant R, G axis in the latter case. Modulating surround contrast induces modulation at isoluminance that is nulled well by test contrast modulation. Spatiotemporal properties of the induction are examined.

© 1992 Optical Society of America