1 Perception, Illusion and VR CSCI 299-02, Spring 2008 Lecture 7 Seeing Color.
Seeing Color Examples
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Transcript of Seeing Color Examples
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3. White objects appear white because they reflect all the colors of the visible spectrum.
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Even though the visible spectrum consists of seven different colors, all of the color seen by the human eye is a mixture of the three primary colors: red, green, and blue.
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Red, green, and blue are the primary additive colors. When mixed together in different proportions, you can make just about any color. When mixed in equal proportions (added together), the three primary colors yield white light.
http://www.micro.magnet.fsu.edu/primer/java/scienceopticsu/light/additive.html
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A pigment is a colored material that absorbs some colors and reflects others. The primary pigments are:
1. magenta2. yellow3. cyan
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Cyan, Magenta, and Yellow are the primary subtractive colors. These colors are combined to produce print media and photographic film. When the subtractive primary colors magenta, cyan, and yellow are added together, they form the color black.
http://www.micro.magnet.fsu.edu/primer/java/scienceopticsu/light/subtractive.html
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Color blindness occurs because one or more sets of cones do not function correctly.
Try these tests.http://colorvisiontesting.com/ishihara.htm#plate with 10
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Eye correctly focusing on the retina
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Eyeball is too long or the cornea bulges
Image is focuses before it reaches the retina
Corrected with concave lenses
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Nearsightedness
Incorrect Focal point Correct Focal point
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Eyeball is too short
Image is focuses behind the retina
Corrected with convex lenses
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Farsightedness
focused incorrectly focused correctly
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Farsightedness
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Farsightedness
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Prisms & Rainbows
• Prisms: Separates white light into its component colors. The longer the wavelength, the less it will be bent by the prism.
• Rainbows- light shining thru tiny droplets of water, each droplet acts as a prism
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Interactions of Waves
• Refraction – The bending of a wave due to the wave moving from one type of medium into another. 1. As light rays enter a new
• medium the cause light to bend• 2. The denser the medium –• the slower the light travels
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Interactions of Waves
Reflection – Bounce back wave• –Angle of Incidence is the angle of the wave
coming into the object reflecting the wave.• –Angle of Reflection is the angle bouncing off
and going away from the object
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Interactions of Waves
•Diffraction – Wave passing a barrier or going through a hole in a barrier bends and causes the wave to wrap around the
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Surface of the cornea is curved unevenly
Image is not focused in the right place
Corrected with a combination of lenses