Unexpected colored shadows: beyond simple additive color mixtures
J.L. Nieves, J.A. García, J. Romero
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Base Information
Volume
V48 - N2 / 2015 International Year of Light
Reference
153-158
DOI
http://dx.doi.org/10.7149/OPA.48.2.153
Language
Spanish / Español
Keywords
Color Vision, Color, Optics Education, Optics Experiments.
Abstract
The aim of this work was to clarify the difference between two color phenomena: the shadow color, which adds color to the shadows, and the colored shadows, which appears due to the context effect on the color perception. A laboratory photograph is introduced to illustrate the colored shadow effect and how this perceptual effect cannot be explained using classical colorimetry. A yellow colored shadow is observed when two separate white and blue lights illuminate a blank screen and an obstacle occludes part of the light impinging on the screen, and the Retinex Theory is used to explain that phenomenon.
References
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G. Wyszecki, W. S. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulae, John Wiley & Sons, Inc., London, 2000.
E.B. Goldstein, Sensation and Perception, Thomson Wadsworth, Canada, 2007.
Khan Academy, Light and Color at https://www.khanacademy.org/partner- content/Exploratorium/Light-and-color/Colored-shadows/v/colored-shadows-introduction-1 http://arxiv.org/abs/1503.00506
S. Houde-Walter, G. Pierce, "Colored Shadows and Retinex Vision," Optics and Photonics News 3, 5, 64-65 (1992).DOI
J.W. Von Goethe, Theory of Colors, trans. into English by C.L. Eastlake, Cass Publ., London, 1967, p.34 et seq.; The Nature of Light and Color in the Open Air, section 96, 134, Dover Press, New York, 1954