day19 - Psychology 2050 Perception 2 November 10 Day 19

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Psychology 2050 Perception 2 November 10 Day 19
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color, history, & physiology dimensions of color hue, saturation, & lightness hue = wavelength  (in nanometers) Newton's three discoveries primaries: physical mixing physiological tuning psychological/cultural salience status of yellow additive & subtractive colors natural colors color blindness & weakness metamers & neutral points costs (& benefits) of color-blind males
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electromagnetic spectrum
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     Color                Tonal Qualities       Qualities hue     pitch saturation    ~inverse of timbre lightness   loudness
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hue
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∆λ delta lambda function Hayek & anisomorphism Day 3
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organization of color
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lightness slightly  correlated with hue color spindle
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hue ---> ~lightness ---> more later,  on Day 20 Munsell color chart
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change in location of  the distribution of  wavelengths same mean of  distribution; more  light same mean of  distribution;  less   variance in  wavelengths variance = std dev 2
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Newton's three discoveries ( Opticks , 1704) 1. divisibility of white light into a rainbow of colors ROYGB(IV)    -- Kepler, Descartes 2. reconstitutability of white light from the  rainbow of color 3. reconstitutability of white light from just three            sufficiently spaced colors
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Newton's three discoveries 1. divisibility of white light into a rainbow of colors     ROYGB(IV) white light rainbow
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Newton's three discoveries 2. reconstitutability of white light from the      rainbow of color rainbow white light angered Goethe
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Newton's three discoveries 3. reconstitutability of white light from just three     sufficiently spaced colors white light parts of  rainbow
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primaries: physical mixing     -->additive & subtractive colors   physiological tuning psychological/cultural salience          --> day 20 status of yellow natural colors today
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demo by Thomas Young RG B
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color tv Henri-Edmund Cross,  La  Baie de Cavalière,   1906/7 examples of  additive color  mixture
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Primaries 3-color theory,   RGB -Young/Helmholtz evidence: Newton's third demonstration Young's logic receptors 4-color theory,  RYGB - Hering     status of yellow evidence: introspection afterimages ganglion cells
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one receptor can register  only light and dark univariance
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logic of Thomas Young
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logic of Thomas Young neutral point
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logic of Thomas Young
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∆λ delta lambda function
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logic of Thomas Young still “ambiguity” at ends of spectrum
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why settle for three chromatic receptors?
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day19 - Psychology 2050 Perception 2 November 10 Day 19

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