PSYC 215 Chapter Notes -Additive Color, Spectral Sensitivity, Reflectance
12 Mar 2014
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Document Summary
Colour space: colour relates to wavelength, and is processed first by the three classes of cone receptors with different spectral sensitivity curves. Visual neurons then use chromatic opponency to encode wavelength. They define the cardinal directions of chromaticity, and there are two cardinal axes r-g and y-b. Likewise, blue and yellow are opponent, as are light and dark. Subtractive mixtures: subtractive colour mixing: removal of wavelength components from a stimulus by absorption or scattering. This is the basis of mixing pigments: the primary pigments are cyan, yellow, and magenta each absorbing all wavelengths except those in the region they appear. When mixed, the result is determined by the light spectra that remain for reflection to the eye. Additive mixtures: additive colour mixing: superimposing spectrally different light sources adds wavelength components. The result is determined by the cumulative spectra emitted from the various sources.
