Color

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Color

• Mrs. Coyle

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Color

• Color is the perceptual quality of light.
• The human eye can distinguish almost ten million
  colors.

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Electromagnetic Waves

• http//www.walter-fendt.de/ph11e/emwave.htm

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• Different atoms and molecules have different
  natural frequencies of vibration, thus they
  absorb different frequencies of visible light.
• The energy of the frequencies absorbed turns to
  heat.

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Color of Light Comes From

• Emission
• Reflection
• Transmission
• Interference
• Dispersion
• Scattering

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Color of Light Comes From

• Emission the object itself is a source of light
  with a color determined by its spectra
• Reflection certain frequencies are reflected
  from the object while others are absorbed
• Transmission certain frequencies are transmitted
  through the object while others are absorbed

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Color of Light Comes From

• Interference certain frequencies are amplified
  by constructive interference while others are
  attenuated by destructive interference
• Dispersion the angular separation of a
  polychromatic light wave by frequency during
  refraction
• Scattering the preferential reradiation of
  certain frequencies of light striking small,
  suspended particles

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Dispersion

• The separation of light into its constituent
  colors after it passes through a prism.

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Primary Colors of Light Red, Green, Blue(
combine to white)

• Color mixing
• red  green  yellow
• green  blue  cyan
• blue  red  magenta
• red  green  blue 
•  white

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Applications

• Systems that work by additive color mixing
  include 
• movie film
• Slide projector
• television and computer displays

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• Secondary colors of Light cyan, magenta, and
  yellow(combine to white.)
• A complementary color is formed by subtracting a
  primary color from white light.
• Every secondary color is the complement of a
  primary color.

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Primary Colors of Pigment(Cyan, Yellow, Magenta
combine to Black)
Subtractive color mixing cyan  magenta  blue mag
enta  yellow  red yellow  cyan  green cyan  m
agenta  yellow black