07 Perceiving Color - 1 Perceiving Color WEEK 7 2 Lecture...

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10/11/2016 1 Perceiving Color WEEK 7 Lecture Outline Intro to color Mixing color Color deficiencies Theories of color perception Trichromatic Opponent-Process Constancy Color Lightness Intro to Color Why Color? It’s easy to ignore color’s importance See it everywhere, all of the time May have been evolutionarily selected Primates Identify fruit Fruit from foliage Good fruit from bad fruit Figure and ground Color Wavelengths of light 400 to 450nm appears violet 450 to 490nm appears blue 500 to 575nm appears green 575 to 590nm appears yellow 590 to 620nm appears orange 620 to 700nm appears red 1 2 3 4 5
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10/11/2016 2 Color Munsell Color System Division of colors, 3 dimensions 1.Hue 2.Chroma (Saturation) 3.Value (Lightness; NOT Brightness) Perceive about 200 different hues Many more colors made by changing saturation Pure (“unique”) colors Red Green Blue Yellow Chromatic colors Achromatic colors A nerdy way to see it Hue Mean Chroma Standard deviation Value Integral Munsell Color System Color Color of objects determined by wavelengths of light Selectively transmitted Selectively reflected 6 7 8 9
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10/11/2016 3 Bananas Absorb: reds, blues, greens Reflect: yellows A projector showing an image of bananas Transmits: Yellows Mixing Color Additive color mixture Superimposition of different transmitted wavelengths Produces a new color Subtractive color mixture Mixing pigments that each absorb different wavelengths Produces a new color
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