Jump to ContentJump to Main Navigation
Seeing Black and White$
Users without a subscription are not able to see the full content.

Alan Gilchrist

Print publication date: 2006

Print ISBN-13: 9780195187168

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780195187168.001.0001

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (www.oxfordscholarship.com). (c) Copyright Oxford University Press, 2017. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a monograph in OSO for personal use (for details see http://www.oxfordscholarship.com/page/privacy-policy).date: 22 April 2018

The Anchoring Problem

The Anchoring Problem

Chapter:
(p.224) 9 The Anchoring Problem
Source:
Seeing Black and White
Author(s):

Alan Gilchrist

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195187168.003.0009

This chapter deals with the essential but only recently recognized problem of anchoring in lightness perception. Previously, lightness theories had no anchoring rules and thus could predict only relative lightness values, not specific values. An anchoring rule or set of rules is the final component required for a complete theory of veridical perception. Although it has not been widely recognized, most theories of lightness perception, including decomposition theories, can, at most, assign only relative lightness values to the surfaces in a scene. They may predict, for example, that a particular surface is five times lighter, or three times darker than a neighboring surface. To produce absolute lightness values requires an anchoring rule. This is a rule that identifies a specific value of lightness (like white or middle gray) with some property of the retinal image (like highest luminance, average luminance, or largest area).

Keywords:   anchoring, lightness, retinal images, scaling, highest luminance, surround rule, area rule, luminosity

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .