Data Visualization Principles: Color CSC444 Acknowledgments for - - PowerPoint PPT Presentation

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Data Visualization Principles: Color CSC444 Acknowledgments for - - PowerPoint PPT Presentation

Feb 18, 2024 236 likes •776 views

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

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Data Visualization Principles: Color

CSC444

Acknowledgments for today’s lecture: Tamara Munzner, Miriah Meyer, Maureen Stone

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Usual Reminders

  • Assignment 3 due tonight
  • Assignment 4 posted
  • Office hours on tuesday
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Outlook

Mechanics Principles Techniques

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Why worry about principles?

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Why worry about principles? Ninio’s extinction illusion

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

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Why worry about principles?

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VISION IS COMPLICATED

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Reading

  • “Representing Colors as Three Numbers”, Stone
  • Rainbow Colormap (Still) Considered Harmful,

Borland and Russell.

  • Optional:
  • Face-based Luminance Matching… Kindlmann

et al.

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WHY COLOR?

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Colin Ware, Information Visualization

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LIGHT AND COLOR

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

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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

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How does light work?

https://www.flickr.com/photos/llnl/9403051123/

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How does light work?

http://www.chemistryland.com/CHM107Lab/Exp7/ Spectroscope/Spectroscope.html

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How does light work?

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How does your eye work?

http://www.retinalmicroscopy.com/mosaics.html

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How does your eye work?

http://www.retinalmicroscopy.com/mosaics.html

Cones Rods

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How does your eye work?

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Three numbers!

TRICHROMACY

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same three numbers, same impression

METAMERISM

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OPPONENT PROCESS MODEL

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COLOR VISION DEFICIENCIES

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Ishihara Plates

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

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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
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WHAT ARE THE PRIMARY COLORS?

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WHAT ARE THE PRIMARY COLORS?

  • 1. red, green, blue
  • 2. red, yellow, blue
  • 3. orange, green, violet
  • 4. cyan, magenta, yellow
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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
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Any three “independent” ways of combining color works (!)

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

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

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https://xkcd.com/1492/

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same three numbers, same impression

METAMERISM

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

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COLOR GAMUTS

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CONSTANCY AND ADAPTATION

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SPATIAL ADAPTATION

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SPATIAL ADAPTATION

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SPATIAL ADAPTATION

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SPATIAL ADAPTATION

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http://www.handprint.com/HP/WCL/tech13.html

SIMULTANEOUS CONTRAST

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TEMPORAL ADAPTATION

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

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Impossible Colors (!)

http://upload.wikimedia.org/wikipedia/commons/5/56/ Chimerical-color-demo.svg