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Data Visualization Principles: Color CSC444 Acknowledgments for todays lecture: Tamara Munzner, Miriah Meyer, Maureen Stone Usual Reminders Assignment 3 due tonight Assignment 4 posted O ffi ce hours on tuesday Outlook

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

  2. Usual Reminders • Assignment 3 due tonight • Assignment 4 posted • O ffi ce hours on tuesday

  3. Outlook Mechanics Principles Techniques

  4. Why worry about principles?

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

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

  7. Why worry about principles?

  8. VISION IS COMPLICATED

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

  10. WHY COLOR?

  11. Colin Ware, Information Visualization

  13. LIGHT AND COLOR

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

  15. 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

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

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

  18. How does light work?

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

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

  21. How does your eye work?

  22. TRICHROMACY Three numbers!

  23. same three numbers, same impression METAMERISM

  24. OPPONENT PROCESS MODEL

  25. COLOR VISION DEFICIENCIES

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

  27. What goes wrong? • Two broad classes of problems: • Only some types of cones present in the eye (rare) • red-green dichromacy, blue-yellow dichromacy • Two types of cones with abnormally close response curves • relatively common for red-green

  29. WHAT ARE THE PRIMARY COLORS?

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

  31. 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

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

  34. Any three “independent” ways of combining color works (!) … and it works against any background color !

  35. http://swiked.tumblr.com/post/112073818575/guys-please- help-me-is-this-dress-white-and

  36. https://xkcd.com/1492/

  37. same three numbers, same impression METAMERISM

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

  42. COLOR GAMUTS

  43. CONSTANCY AND ADAPTATION

  44. SPATIAL ADAPTATION

  45. SPATIAL ADAPTATION

  46. SPATIAL ADAPTATION

  47. SPATIAL ADAPTATION

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

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

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

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