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Color

The visible waves in the electromagnetic spectrum. Color. Why do we perceive color?. Each color has a different wavelength and frequency. Substances either reflect or absorb different wavelengths. The color of an object is the color of light it reflects. All colors reflected make “white”.

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Color

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  1. The visible waves in the electromagnetic spectrum Color

  2. Why do we perceive color? • Each color has a different wavelength and frequency. • Substances either reflect or absorb different wavelengths. • The color of an object is the color of light it reflects. • All colors reflected make “white”. • All colors absorbed make “black”.

  3. Examples: • If light hits a red tulip, all colors are absorbed except red. Red is reflected. • As it hits the leaf, all colors are absorbed except green. Green is reflected. • What happens when light hits a skunk?

  4. Dark & Light • Dark colors absorb light and heat • Light colors reflect light and heat • Think about choosing to wear dark or light colors the summer • Which pug stays cooler in the summer, Zeus or Zoey?

  5. Color Frequencies: • Red has the longest wavelength and shortest frequency. • Violet has the shortest wavelength and highest frequency. • When listing colors, order is important. • Colors & wavelengths: red 620–750 nm (a nanometer=10-9) orange 590–620 nm yellow 570–590 nm green 495–570 nm blue 450–495 nm violet 380–450 nm

  6. Rainbows • A rainbow is an event in nature when the spectrum of light appears in the sky as the sun shines on droplets of water. • What do you see about the order of colors in a rainbow? • Why do you think this happens? Look at this double rainbow.

  7. Combining Colors • Traditional color theory—less accepted today. • All pigment colors can be mixed by combining primary colors of Red, Yellow, & Blue (RYB).

  8. Combining Colors • Subtractive—used in mixing pigments. • All colors can be mixed to absorb different wavelengths of color using primary pigment colors of Cyan, Magenta, Yellow, & Black (CMYB).

  9. Combining Colors • Additive—mixing colors of light. • All colors of light can be produced by mixing primary light colors: Green, Red, & Blue (GRB).

  10. How do animals see color? • Some animals perceive different wavelengths than humans. • http://www.eyes-and-vision.com/how-animals-see-the-world.html

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