Grassmann's laws (perception)

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Three basic laws of colour mixing. If x, y, and z are distinct stimulus colours, and if the symbol = indicates visual matching, then the laws state that: (a) If x = y, then x + z = y + z (if equivalent colours are added to equivalent colours, then the sums are also equivalent); (b) If x = y, then xz = yz (if equivalent colours are subtracted from equivalent colours, then the differences are also equivalent); (c) If x = z and y = z, then x = y (colours that are equivalent to the same colour are equivalent to each other). See also additive primary, primary colour (1, 2), subtractive primary. [Named after the German-Polish mathematician and physicist Hermann G(ünther) Grassmann (1809–77) who formulated them in 1853]

Subjects: Psychology.

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