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Light and the Eye
• In a healthy eye, light enters and is focused on the retina.
• The retina is made of two types of cells, cones and rods, they both absorb light.
• Absorption of light causes chemical reactions to convert light energy into nerve impulses that are sent to the brain.
• Cones allow you to see colors.• Rod are sensitive to dim light and useful for night
vision.
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Light and Color
• Whitehite light is made up of all the wavelengths of visible light.
• Red• Orange• Yellow• Green • Blue• Indigo• Violet
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Primary Colors of Light• The simplified spectrum is the primary colors:
– Red, Green, and Blue
• Addition of these colors creates all the colors.• TV’s and computer monitors use RGB• Tiny pixels on your screen are generated using
only these three primary colors of light.
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Color Addition•Color addition only works with pure light.
•Addition of primary colors creates complementary colors:
Red + Green = Yellow
Blue + Green = Cyan
Red + Blue = Magenta
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Complementary Colors
• Two colors of light that add together to produce white are complementary colors.
• For example: Red + Green = Yellow
• Red + Green + Blue = White
• Yellow + Blue = White
• Blue and Yellow are complementary colors of one another.
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Color Subtraction• Color subtraction
occurs with paint, crayons, dyes, and filters.
• These absorb some colors and reflect the colors your eyes see.
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Color Subtraction
White light (made up of red, green, and blue) strikes a surface. The red dyes absorb (or subtract out) the green and blue light and reflect the red dye back to your eyes. That is why a red object appears red in white light.
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Color Subtraction
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Color Printers
• Use the complementary colors, Magenta, Yellow, and Cyan
• You can produce a large range of reflected colors by adjusting the strengths of each secondary color.
• The smaller the dots, the sharper the image.
How Stuff Works – Color Negatives & Printing
Color Television