COLOR THEORY

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COLOR THEORY

• GE 510
• Remote Sensing

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General Types

• Additive color theory
• Mixtures of light
• RED
• GREEN
• BLUE
• Subtractive color theory
• Mixture of pigments
• MAGENTA
• YELLOW
• CYAN

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History of Color Theory

• 1704
• Newton published Opticks and identified that
  white light is composed of many colors
• Objects look different in different lights
• Concluded seven colors in the spectrum
• Selective Absorption

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Selective Absorption
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History of Color Theory

• 1802
• Thomas Young
• Only 3 subtractive primary colors (Red, Yellow,
  Blue)
• 1831
• David Brewster English physicist
• Only 3 subtractive primary colors (Magenta,
  Yellow, Cyan)
• 1852
• von Helmholtz
• 1866
• Maxwell - vermilion, emerald green, and
  ultramarine

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Ordering Color

• Munsell Color System - 1923
• CIE Colorimetric Standard Observer Model 1931
• Heggelund 1993
• Pantone

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Additive Color Scheme
50
50
50
100
100
100
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Additive Color Scheme
100
100
0
0
100
100
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Additive Color Scheme
100
0
100
0
100
100
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8-bit data format

• 1-bit data 21 ? 2 possible value
• 4-bit data 24 ? 16 possible value
• 8-bit data 28 ? 256 possible values
• 16-bit data 216 ? 65536 possible values
• Instead of percentages now think binary
• 0 0
• 100 255

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Additional Information

• http//www.bu.edu/smec/lite/color/mix/mixmac.html
• http//www.bu.edu/smec/lite/color/spatial/index.ht
  ml
• http//kiptron.psyc.virginia.edu/steve_boker/Color
  Vision2/node1.html