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Understanding Light and Color: Spectral Differences from Red to Blue

Discover why red and blue light have different wavelengths and frequencies, how pigments selectively absorb color, and the primary and secondary colors of light. Explore the fascinating world of complementary colors and color math concepts. Learn why peppers appear red due to reflected light and why it's cooler to wear white. Unravel the mysteries of light absorption, color combinations, and the absence of light in black. Get insights into perceiving color based on light reflection and absorption, and how objects appear different based on their interaction with light.

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Understanding Light and Color: Spectral Differences from Red to Blue

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Presentation Transcript

  1. CH 28 NOTES

  2. WHAT MAKES RED DIFFERENT THAN BLUE? THEY HAVE DIFFERENT WAVELENGTHS AND DIFFERENT FREQUENCIES

  3. ROYGBIV R The only thing we SEE is LIGHT OYGBIV IS ABSORBED You don’t see peppers - you see red light reflected from peppers

  4. THE PEPPER HAS RED PIGMENT PIGMENT- material that selectively absorbs color

  5. LOW f MED f HIGH f IN THIS CLASS WE’RE GOING TO SIMPLIFY THE SPECTRUM INTO 3 PRIMARY COLORS THE PRIMARY COLORS OF LIGHT ARE: RED GREEN BLUE

  6. YELLOW GREEN RED WHITE MAGENTA CYAN BLUE

  7. Secondary Colors of Light YELLOW MAGENTA CYAN

  8. R G B R G B IS ABSORBED

  9. R G B G R B IS ABSORBED

  10. R G B R B G IS ABSORBED

  11. R G B R G B IS ABSORBED

  12. R G B R G B No light IS ABSORBED That is why it is coolest to wear white

  13. R G B No light All light IS ABSORBED That is why it is hotest to wear black

  14. * White is the combination of all light * Black is the absence of light

  15. Necklace Demo

  16. Complementary Colors - Two colors that combine to make white light RED & CYAN BLUE & YELLOW GREEN & MAGENTA

  17. Color Math! Red + Blue = White - Green = White - Cyan = Yellow + Blue = Magenta Magenta Red White

  18. B The source of light is not always white B IS ABSORBED There is no light reflected, the pepper appears BLACK

  19. R R The banana would appear red

  20. THE END

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