PSYB51H3 Chapter Notes - Chapter 5: Spectral Power Distribution, Color Term, Ewald Hering
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It"s a (cid:373)istake to thi(cid:374)k of spe(cid:272)ifi(cid:272) (cid:449)a(cid:448)ele(cid:374)gths of light as being specific colours. Clara rebello: a specific light produces a specific set of responses from the three cone types. The young-helmholtz theory: metamers, we are not typically exposed to single wavelengths, almost every light and every surface that we see is emitting or reflecting a wide range of wavelengths, two lights (ex. Red and green), mixed together, produce a mixture that excites the l- and m-cones equally: the rest of the nervous system knows only what the cones tell it. More generally, any pair of stimuli that are perceived as identical in spite of physical differences: mi(cid:454)i(cid:374)g (cid:449)a(cid:448)ele(cid:374)gths does(cid:374)"t (cid:272)ha(cid:374)ge the ph(cid:455)si(cid:272)al (cid:449)a(cid:448)ele(cid:374)gths. Thomas young and later on hermann von helmtoltz. James clerk maxwell developed a colour-(cid:373)at(cid:272)hi(cid:374)g te(cid:272)h(cid:374)i(cid:395)ue (cid:272)e(cid:374)t(cid:396)al to hel(cid:373)holtz"s work: the technique observer would try to use different amou(cid:374)ts of (cid:862)p(cid:396)i(cid:373)a(cid:396)(cid:455)(cid:863) coloured lights to exactly match another light.
