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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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The Wedding Cake Illusion

The Wedding Cake Illusion

Interaction of Geometric and Photometric Factors in Induced Contrast and Assimilation

Chapter:
(p.442) Chapter 59 The Wedding Cake Illusion
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Branka Spehar

Colin W. G. Clifford

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0059

Lightness induction is the shift in surface appearance caused by adjacent or nearby surfaces. Spatial context can make a surface appear more different from (contrast) or more similar to (assimilation) its surround. Although assimilation effects tend to occur with more complex contexts, often containing repetitive patterns, we are still generally unable to ascertain the circumstances in which assimilation or contrast will occur. This chapter explores the interaction of geometric and photometric characteristics leading to contrast and assimilation in lightness induction. Concepts covered include the wedding cake illusion, White’s effect, the checkerboard illusion, the bull’s eye illusion, and luminance contrast.

Keywords:   lightness induction, contrast, assimilation, White’s effect, wedding cake illusion, checkerboard illusion, bull’s eye illusion, luminance constraint

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