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The Oxford Compendium of Visual Illusions$
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Arthur G. Shapiro and Dejan Todorovic

Print publication date: 2017

Print ISBN-13: 9780199794607

Published to Oxford Scholarship Online: June 2017

DOI: 10.1093/acprof:oso/9780199794607.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 28 September 2021

The Glare Effect

The Glare Effect

(p.454) Chapter 61 The Glare Effect
The Oxford Compendium of Visual Illusions

Daniele Zavagno

Olga Daneyko

Oxford University Press

The glare effect consists in a strong brightness enhancement of a bright region determined solely by the presence of linear luminance gradients organized in such a way that the bright ends of the gradients delimit the bright region. The effect is obtained with both achromatic and chromatic gradients. In its achromatic version, the illusion has been employed to study the perception of luminosity and the effects of brightness on lightness in simultaneous contrast configurations. The role of photometric gradients and their distribution in space are discussed, with demos showing how luminance gradients can be employed to generate also darkness enhancements and impressions of illumination. A variant of the glare effect is illustrated in which the brightness enhancement is obtained by employing discrete grey steps separated in space, organized to form so-called luminance pseudo-ramps.

Keywords:   brightness, glare effect, illumination, lightness, luminance gradients, luminosity, illumination

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