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22.3 Using Color

22.3 Using Color. pp. 487 - 491 Mr. Richter. Agenda. Warm-Up Review HW Notes: How We See Objects Mixing Pigments (The Subtractive Color Process). Objectives: We Will Be Able To…. Describe how humans see specific colors. Explain the subtractive color process.

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22.3 Using Color

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  1. 22.3 Using Color pp. 487 - 491 Mr. Richter

  2. Agenda • Warm-Up • Review HW • Notes: • How We See Objects • Mixing Pigments (The Subtractive Color Process)

  3. Objectives: We Will Be Able To… • Describe how humans see specific colors. • Explain the subtractive color process. • Determine what color of light will be reflected if a colored light is shined on a certain object.

  4. Warm-Up: • Leaves are green. What makes them green? That is, why do we perceive them to be green? • Discuss at your table and we will discuss as a class in a few minutes.

  5. How We See Objects

  6. How We See Objects • An object will appear to be the color of the light that it reflects. • Green leaves appear green because they absorb all wavelengths of light except green, which they reflect. • If a red light shines on a green leaf, what color will the leaf appear to be? • Black!

  7. How We See Objects • Green objects only reflect green light. • When white light shines on green objects (white light contains green), green light is reflected • When red light shines on green objects (red light contains no green), the light is absorbed, and the object appears black. • What color does the leaf appear if green light shines on it? • Green, of course!

  8. Mixing Pigments The Subtractive Color Process

  9. Mixing Pigments • To make objects a certain color, pigments (little specks of colored material) are mixed together. • For an object to reflect a certain color, all other colors of light must be absorbed. • This is called the subtractive color process.

  10. Mixing Pigments • The subtractive color process is also called the CMYK process: • Cyan • Magenta • Yellow • blacK • These colors are the subtractive primary colors.

  11. Mixing Pigments • How do you make green paint? • Mix cyan (which absorbs red) • With yellow (which absorbs blue) • If red and blue are absorbed, only green is reflected!

  12. Mixing Pigments • If pure yellow light shines on a magenta t-shirt, what color will the t-shirt appear to an observer? • Yellow light = green + red light • Magenta = reflects red + blue • Yellow shining on magenta reflects only red light

  13. Expert • http://www.youtube.com/watch?v=gtgBHsSzCPE

  14. Wrap-Up: Did we meet our objectives? • Describe how humans see specific colors. • Explain the subtractive color process. • Determine what color of light will be reflected if a colored light is shined on a colored object.

  15. Homework • p. 495 #8-11

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