cs781 - Colour for Computer Graphics - Winter 2012

Course Notes

Lecture 11 - Visual Response to Light II

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Psychophysics of Opponent Colours

Phenomena

  1. Reddish-green and yellowish-blue
  2. Unique hues
  3. Flicker photometry
  4. Minimally distinct border
  5. Unusual properties of yellow-blue axis
  6. Successive contrast
  7. Simultaneous contrast

Colour Naming

Berlin & Kay

Cross-cultural study of colour distinctions supported by language

  1. Stage I: Dark-cool and light-warm (this covers a larger set of colors than English "black" and "white".)
  2. Stage II: Red
  3. Stage III: Either green or yellow
  4. Stage IV: Both green and yellow
  5. Stage V: Blue
  6. Stage VI: Brown
  7. Stage VII: Purple, pink, orange, or grey

Less reliable data showing that children learn colour terms in roughly this order

Boynton

Give each colour I show you a one word name

Eleven colour names appear

  1. White
  2. Grey
  3. Black
  4. Red
  5. Orange
  6. Yellow
  7. Green
  8. Blue
  9. Purple
  10. Brown
  11. Pink

Consistent topology (but not geometry)

                    /-------------------------\
                    |                          |
                    |        White -\--------Yellow--\----\
                    |          |     \                \    \
                  Green-------Grey -\-\-- Pink---\     |    |
                   | \         |     \     |    /-\--Orange |
                   |  \        |      \---Red--/         |  /
                   |   \       |           |             | /
                   |    \      |          / \-----\      |/
                 Blue----\---Black-------(-------Brown---/
                   |           |         /
                   \---------Purple-----/

Neural Theories

   R---\--------\
        minus---(--------------red/green
   G---/---------plus-\--------white/black
                       )minus--yellow/blue
   B------------------/

Using Colour in the Real World

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