Patterned backgrounds can induce large shifts in color appearance, even with patterns of only 10% S-cone contrast (S. K. Shevell & P. Monnier, 2005). The present study tested whether a background pattern could induce color shifts even at a below-threshold contrast. In the first experiment, S-cone contrast threshold for discriminating a pattern from a homogenous background was measured by a 2AFC procedure. Next, a test ring was inserted within the patterned background. With the test ring present, six of eight observers reliably distinguished trials with a patterned background from trials with a homogeneous field, even though the S-cone contrast in the pattern was too low to be discriminated from a homogeneous background. This suggested that a below-threshold S-cone pattern shifted the color appearance of the test ring; that is, the appearance of the test was used to discriminate whether the background was patterned or homogeneous. This was corroborated by asymmetric color matches, which revealed a color shift caused by subthreshold S-cone contrast within the patterned background.
展开▼
机译:图案背景可能会导致颜色外观发生较大变化,即使只有10%的S锥对比度也是如此(S. K. Shevell&P. Monnier,2005)。本研究测试了即使在低于阈值的对比度下,背景图案是否也可以引起颜色偏移。在第一个实验中,通过2AFC程序测量了用于将图案与同质背景区分开的S锥对比度阈值。接下来,将测试环插入带图案的背景中。在有测试环的情况下,即使模式中的S锥对比度太低而无法与均质背景区分开,八名观察员中的六名仍能可靠地将具有背景图案的试验与均质场的样品区分开。这表明低于阈值的S锥图案会改变测试环的颜色外观;也就是说,测试的外观用于区分背景是带图案的还是均匀的。这由不对称的颜色匹配所证实,该颜色匹配揭示了图案背景中亚阈值S锥对比度造成的颜色偏移。
展开▼