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Talbot's law


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The proposition that when two or more colours differing in hue or lightness are alternated, as on a rotating Maxwell disc divided into contrasting sectors, there is a frequency beyond which perceived flicker ceases and an impression of uniform colour is created, and when a colour is mixed with black in this way, its lightness is proportional to the area of the disc that it fills. Also called the Talbot-Plateau law. [Named after the English photographer, physicist, and psychologist (William Henry) Fox Talbot (1800–77) who published it in 1834, although the Belgian physicist Joseph Antoine Ferdinand Plateau (1801–83) had already formulated the underlying principle and published it in an obscure article in 1829]


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