Color Perception

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Color Perception Melanie Edgar
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What We Learned in Class

• All colors are created by varying the brightness
  of red, green, and blue (RGB).

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Light Waves (we also learned this in class)

• Visible light spectrum the narrow range of
  wavelengths that humans can see, range from
  700-400 nm
• This range of light wavelengths is referred to as
  ROYGBIV
• Red
• Orange
• Yellow
• Green
• Blue
• Indigo
• Violet

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Light Waves Enter the Eye

• Light enters through the eye and passes through
  the
• Cornea
• Aqueous humor
• Lens
• Vitreous humor
• Retina

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Retina

• Retina
• 1. Rods vision in low light
• 2. Cones color vision and detail

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Cones

• Cones
• Cone pigments
• Red-sensitive pigments
• Green-sensitive pigment
• Blue-sensitive pigment
• (this is where RGB comes from)

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Visual Pathways of the Brain
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Perceptual Constancy and Brightness Constancy

• Perceptual constancy the ability to perceive
  sameness even when the image on the retina
  changes
• Brightness constancy brightness of an object is
  perceived based on real world knowledge and on
  the brightness of that object relative to its
  background

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Optical Illusions Involving Brightness Constancy

• http//www.echalk.co.uk/amusements/OpticalIllusion
  s/illusions.htm

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Sources

• http//health.howstuffworks.com/eye.htm
• http//en.wikipedia.org/wiki/Color_vision
• http//www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/l
  ight/u12l2a.html
• http//www.echalk.co.uk/amusements/OpticalIllusion
  s/illusions.htm
• ECE 101 Textbook