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Data Visualization Principles: Color CSC444 Acknowledgments for todays lecture: Tamara Munzner, Miriah Meyer, Maureen Stone Outlook Mechanics Principles Techniques Why worry about principles? Why worry about principles? Ninios

  1. Data Visualization Principles: Color CSC444 Acknowledgments for today’s lecture: Tamara Munzner, Miriah Meyer, Maureen Stone

  2. Outlook Mechanics Principles Techniques

  3. Why worry about principles?

  4. Why worry about principles? Ninio’s extinction illusion

  5. Why worry about principles? https://cscheid.net/2014/12/13/not-spirals.html

  6. Why worry about principles?

  7. VISION IS COMPLICATED

  8. Reading • “Representing Colors as Three Numbers”, Stone • Rainbow Colormap (Still) Considered Harmful, Borland and Russell. • Optional: • Face-based Luminance Matching… Kindlmann et al.

  9. WHY COLOR?

  10. Colin Ware, Information Visualization

  12. LIGHT AND COLOR

  13. How does the yellow from your laptop display “equal” the yellow from the sun , and that from a painting ?

  14. How does light work? • Each photon has a “wavelength”, roughly the frequency in which it wiggles as it travels through space • Visible light is the same thing as FM radio is the same thing as X-rays is the same thing as microwaves

  15. How does light work? https://www.flickr.com/photos/llnl/9403051123/

  16. How does light work? http://www.chemistryland.com/CHM107Lab/Exp7/ Spectroscope/Spectroscope.html

  17. How does light work?

  18. How does your eye work? http://www.retinalmicroscopy.com/mosaics.html

  19. How does your eye work? Cones Rods http://www.retinalmicroscopy.com/mosaics.html

  20. How does your eye work?

  21. TRICHROMACY Three numbers!

  22. same three numbers, same impression METAMERISM

  23. OPPONENT PROCESS MODEL

  24. COLOR VISION DEFICIENCIES

  25. Ishihara Plates http://www.dfisica.ubi.pt/~hgil/ p.v.2/Ishihara/Ishihara. 24.Plate.TEST.Book.pdf

  26. What goes wrong? • Only some types of cones present in the eye • red-green dichromacy, blue-yellow dichromacy (rare)

  28. WHAT ARE THE PRIMARY COLORS?

  29. WHAT ARE THE PRIMARY COLORS? 1. red, green, blue 2. red, yellow, blue 3. orange, green, violet 4. cyan, magenta, yellow

  30. WHAT ARE THE PRIMARY COLORS? 1. red, green, blue 2. red, yellow, blue 3. orange, green, violet 4. cyan, magenta, yellow 5. all of the above

  31. Any three “independent” ways of combining color works (!)

  33. same three numbers, same impression METAMERISM

  37. Dividing by “luminance” http://sysmagazine.com/posts/181580/

  38. COLOR GAMUTS

  39. CONSTANCY AND ADAPTATION

  40. SPATIAL ADAPTATION

  41. SPATIAL ADAPTATION

  42. SPATIAL ADAPTATION

  43. SPATIAL ADAPTATION

  44. SIMULTANEOUS CONTRAST http://www.handprint.com/HP/WCL/tech13.html

  47. TEMPORAL ADAPTATION http://www.moillusions.com/black-and-white-in-colour- again.html/13191556xteeocm7

  48. Impossible Colors (!) http://upload.wikimedia.org/wikipedia/commons/5/56/ Chimerical-color-demo.svg

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