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class+9+posted+_color+vision_ - Sensation and Perception...

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Sensation and Perception Class IX: Color Vision
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Practical Notes: Exams are now graded, and scores posted on Sakai. To see your exam, you can make an appointment with Marley at: [email protected]
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Figure 5.4 The two wavelengths that produce the same response from one type of cone (M), produce different patterns of responses across the three types of cones (S, M, and L)
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Trichromacy Trichromacy : The theory that the color of any light is defined in our visual system by the relationships of three numbers, the outputs of three receptor types now known to be the three cones Also known as the Young–Helmholtz theory
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Trichromacy Metamers : Different mixtures of wavelengths that look identical. More generally, any pair of stimuli that are perceived as identical in spite of physical differences
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Figure 5.6 If two sets of lights produce the same responses, they are metamers and must look identical
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Trichromacy Additive color mixing : A mixture of lights If light A and light B are both reflected from a surface to the eye, in the perception of color the effects of those two lights add together
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Figure 5.9 Georges Seurat’s painting La Parade (1887–1888) illustrates the effect of additive color mixture with paints
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Trichromacy Subtractive color mixing : A mixture of pigments If pigment A and B mix, some of the light shining on the surface will be subtracted by A and some by B. Only the remainder contributes to the perception of color
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Figure 5.7 In this example of subtractive color mixture, “white”—broadband—light is passed through two filters
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Trichromacy Color space : A three-dimensional space that describes all colors. There are several possible color spaces RGB color space: Defined by the outputs of long, medium, and short wavelength lights HSB color space: Defined by hue, saturation, and brightness
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