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Understanding Color Spaces and Chromaticity Diagrams

Explore the concepts of color spaces, chromaticity diagrams, and color mixing in this comprehensive overview. Learn how to specify color using various methods such as RGB, XYZ, and xyY. Understand the significance of dominant color, saturation, and complementary colors. Discover practical examples of color mixing, the importance of monochromatic sources, and the implications of color temperature in real-world applications. Essential for anyone dealing with color theory or digital imaging.

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Understanding Color Spaces and Chromaticity Diagrams

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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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