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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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Color and Luminance

Color and Luminance

Afterimages, Combinations, and Flicker

Chapter:
(p.323) Chapter 38 Color and Luminance
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Stuart Anstis

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0038

Color and luminance interact in many ways in the human visual system. For instance, the colors in an afterimage, which are due to adaptation of retinal cones, are especially vivid when test contours, presented after the adapting image, coincide with the blurred edges of the afterimage. A single colored adapting pattern can give rise to two differently colored afterimages, according to the position of black lines in the test field. This shows that colors seen by the low-acuity chromatic pathways will diffuse outward along, but not across, luminance contours. This is also true for real colors. Finally, flicker-augmented contrast shows that the visual system, when given a choice, will select the most salient color/luminance borders in a stimulus.

Keywords:   afterimages, color, contours, flicker, luminance

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