The Perception of Color

The Perception of Color - 5 5 The Perception of Color...

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5 The Perception of Color Chapter 5 5 The Perception of Color • Basic Principles of Color Perception • Trichromacy • Opponent Processes • Does Everyone See Colors the Same Way? • From the Color of Lights to a World of Color 5 Basic Principles of Color Perception Color: Not a physical property but rather a psychophysical property. –Most of the light we see is reflected. –Typical light sources: Sun, light bulb; emit a broad spectrum of wavelengths 400–700 nm.
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5 Photoreceptor Response 5 Basic Principles of Color Perception (cont’d) Problem of univariance: An infinite set of different wavelength-intensity combinations can elicit exactly the same response from a single type of photoreceptor. – One type of photoreceptor cannot make color discriminations based on wavelength 5 The Problem of Univariance
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5 Trichromacy Scotopic: Referring to dim light levels at or below the level of bright moonlight – Rods are sensitive to scotopic light levels. – All rods contain same type of photopigment molecule: Rhodopsin. – All rods have same sensitivity to wavelength, making it impossible to discriminate light. 5 The Moonlit World 5 Trichromacy Cone photoreceptors: Three varieties – S-cones: Cones that are preferentially sensitive to short wavelengths (blue cones). – M-cones: Cones that are preferentially sensitive to middle wavelengths (green cones). – L-cones: Cones that are preferentially sensitive to long wavelengths (red cones).
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5 Trichromacy With three cone types we can tell the difference between lights of different wavelengths. 5
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This note was uploaded on 03/09/2010 for the course PSY 4283 taught by Professor Ahmad during the Fall '09 term at Henderson.

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The Perception of Color - 5 5 The Perception of Color...

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