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Color - PowerPoint PPT Presentation


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Color. What are the colors of the rainbow?. Where is WHITE?. It’s combination of all colors (all frequencies of light are reflected). If you add more and more colors of MARKERS, the darker and darker the color will get.

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Presentation Transcript
where is white
Where is WHITE?
  • It’s combination of all colors (all frequencies of light are reflected)
slide4
If you add more and more colors of MARKERS, the darker and darker the color will get.
  • But as you add more and more colors of LIGHT, thelighter the result will get!
then what is black
Then what is BLACK?
  • No reflection of color (all frequencies of light are absorbed)
color is due to the way objects reflect light why
Color is due to the way objects reflect light. WHY?
  • The color of an object is not within the object, but in the light which shines upon it
  • Some wavelengths are absorbed and some are reflected
  • What is reflected to our eye is what color we see the object as….
  • Reflects: G
  • Appears: G
  • Reflects: R
  • Appears: R
how do we see color
How do we see color?
  • Our eyes respond to the visible light spectrum
  • We have psychological and physiological responses to light waves of a specific frequency and wavelength impinging upon the eye
the human eye
The Human Eye
  • Retina lined with rods and cones
  • Cones – color sensing (RGB)
  • Rods – light intensity sensing
  • For white light all three cones activated.
interesting fact
INTERESTING FACT:
  • White light results from the combination of just red, green and blue light! Why?
  • Red, Green, Blue = PRIMARYcolors of light!
  • Magenta, Yellow, Cyan = SECONDARY colors of light!
    • Red + blue = magenta
    • Blue + green = cyan
    • Red + green = yellow
          • Through various combinations of these colors we can get all other colors of light! Simulation:
          • http://phet.colorado.edu/en/simulation/color-vision
complementary colors
Complementary Colors
  • Each secondary color can be added to the primary color that is was not composed of to create white light. The matching of colors are called complementary colors.
  • Red + cyan = white
  • Blue + yellow = white
  • Green + magenta = white
mixing paints in art class

violet

RED

orange

orange

YELLOW

green

green

BLUE

violet

Mixing paints in art class
  • Note: The primary and secondary colors of LIGHT are different than mixing paints in art class!
  • Paints appear a certain color because of the colors they reflect/absorb
  • Primary colors of paint (from grade school):
      • Red
      • Yellow
      • Blue
polarization of light
Polarization of Light
  • Due to the unique transverse nature of a light wave, it can be thought of as a transverse wave vibrating in many directions at once if it is unpolarized.
  • A polaroid filter allows us to let only one direction of light through!
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What is all this useful for?

    • Sunglasses
    • 3D movies
      • Allows you to see light from only 1 projector with each eye which gives the perception of depth