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The Bezold effect is an optical illusion, named after a German professor of meteorology Wilhelm von Bezold (1837–1907), who discovered that a color may appear different depending on its relation to adjacent colors.

It happens when small areas of color are interspersed. An assimilation effect called the von Bezold spreading effect, similar to spatial color mixing, is achieved.

The opposite effect is observed when large areas of color are placed adjacent to each other, resulting in color contrast.

See also

• White's illusion

References

• Albers, J. Interaction of color: unabridged text and selected plates. 8. ed. Massachusetts: Yale University Press, 1978.
• Echo Productions. Wilhelm von Bezold. Virtual color museum.
• Bergantini, Ernesto: Farbe im Design. Basiswissen, Gossau, 2010, p. 115.

v t e Optical illusions (list)
Illusions	Afterimage Ambigram Ambiguous image Ames room Autostereogram Barberpole Bezold Café wall Checker shadow Chubb Cornsweet Delboeuf Ebbinghaus Ehrenstein Flash lag Fraser spiral Gravity hill Grid Hering Impossible trident Irradiation Jastrow Lilac chaser Mach bands McCollough Müller-Lyer Necker cube Oppel-Kundt Orbison Penrose stairs Penrose triangle Peripheral drift Poggendorff Ponzo Rubin vase Sander Schroeder stairs Shepard tables Spinning dancer Ternus Vertical–horizontal White's Wundt Zöllner
Popular culture	Op art Trompe-l'œil Spectropia (1864 book) Ascending and Descending (1960 drawing) Waterfall (1961 drawing) The dress (2015 photograph)
Related	Accidental viewpoint Auditory illusions Illusions Tactile illusions Temporal illusion

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