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| Figure 7. Color contrast and constancy arise from the same empirical generation of visual perceptions. In this computer-generated example, the authors carefully controlled the spectral information in the scene. The upper images show the cubes as if in yellowish (top left) or bluish (top right) illumination. The lower images show specific tiles of interest in the absence of these contexts. The yellow-looking tiles depicted as if under blue light and blue-looking tiles depicted as if under yellow light are actually a gray on their own—as shown in the lower boxes marked "blue" and "yellow." This is a striking example of color contrast. On the other hand, the red-looking tiles depicted as if under blue and yellow light both come from tiles that are actually purplish and orangish, respectively, as shown in the lower boxes marked "red." This demonstrates color constancy. These remarkable effects show that the same targets can be made to look like very different colors, and that different colors can be made to look the same by manipulating the context. |