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Announcements 4/9/12

Announcements 4/9/12. Prayer Roy G. Biv - http://www.youtube.com/watch?v=Gf33ueRXMzQ (2:41) HW 26 due today (but it’s very likely Claira won’t pick it up until Thursday night. Shhh!) Exam 3 – Should be graded/entered by end of today

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Announcements 4/9/12

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  1. Announcements 4/9/12 • Prayer • Roy G. Biv - http://www.youtube.com/watch?v=Gf33ueRXMzQ (2:41) • HW 26 due today (but it’s very likely Claira won’t pick it up until Thursday night. Shhh!) • Exam 3 – Should be graded/entered by end of today • Final Exam: My apologies, can’t take it in the Testing Center. Scheduled exam date/time: Tues Apr 17, 3-6 pm. • Any conflicts? • Start at 2 pm? • Some detailed info on the problems… Foxtrot

  2. Reading Quiz • Just kidding

  3. The Goal

  4. Worked Example • X = • Y = • Z = Normalize (because “color” should not depend on overall intensity) • x = • y = • z =

  5. xyY

  6. Another Worked Example • What is (x,y) for a delta function at 560 nm? My estimates: X = 0.59 Y = 0.98 Z = 0 x = .38 y = .62 Do that for every wavelength  the “locus” curve

  7. Chromaticity Diagram Things to observe • The locus Example: 560 nm  (0.38, 0.62) • The white point = (0.33, 0.33) • Basic color mixing (blue + green = cyan, etc.) • “Line of purples” • Linearity: more advanced combining colors • Complementary colors (can mix to get white)

  8. sRGB “green” = (0.30, 0.60) (If xyY is specified, must first transform to XYZ) “red” = (0.65, 0.33) “blue” = (0.15, 0.06)

  9. sRGB • Mixing three sources: triangle • “Gamut” “green” = (0.30, 0.60) “red” = (0.65, 0.33) “blue” = (0.15, 0.06)

  10. On the advantages of monochromatic sources “green” = (0.30, 0.60) “red” = (0.65, 0.33) “blue” = (0.15, 0.06)

  11. K 5000K 2000K 1000K What’s the Color of Blackbody Radiation? The Sun The Sun Wikipedia “Color Temperature”

  12. Color of the Sun? “Stop It” The Sun

  13. For a given (x,y) point • Dominant color (hue), lD • Saturation (purity), P • Complement color, lC What about this point?

  14. Summary: Ways to Specify Color • R,G,B (original color matching functions) • X,Y,Z • x,y,Y • hue, saturation, Y (“hue, brightness, saturation”) • sRGB R,G,B coordinates (if in sRGB gamut) That’s All, Folks

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