Color Perception
How your eye/brain processes colors
Summary
• Human color vision is the result of a) light falling on three different receptors (cones), and b) manipulation and combination of the information from the receptors, called “opponent processing.” Part of the brain’s work here is in compensating for various levels of different hues, which can lead to interesting color phenomena.
Trichromacy of Color Vision
Recall: Rods are sensitive to low lightlevels; cones are sensitive to colors
There are three types of cones, each oneof which is most responsive to a certain range of wavelengths
Trichromacy of Color Vision
wavelength
Res
pons
e
Trichromacy of Color Vision
Your brain is aware only of the response of the photoreceptor; since there is only one type of rod, there can be no color sensitivity
to brain to brain
Trichromacy of Color Vision
cones
rods
Trichromacy of Color Vision
What causes color blindness?
One or two types of cones are missing from the retina
Spectral Complementaries
Colors which when added togetherproduce white light.
This white light appears no differentlyto us than the white light made up ofthe entire spectrum.
C.I.E. Color Diagram
Opponent Processing Theory
Psychological Primary Colors
Why do Lego blocks have the colors they do?
Why do we not describe a coloras “reddish-green” or as “bluish-yellow?”
Opponent Processing Theory
Neural Connections - Chromatic Channels
S I L
y - b
ExcitationInhibition
Neural Connections - Chromatic Channels
S I L
y - b
ExcitationInhibition
r - c
Neural Connections - Chromatic Channels
S I L
y - b
Excitation
w - bkr - g
Colored Shadows
Colored Shadows
Colored Shadows
Colored Shadows
Colored Shadows
Colored Shadows
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