The achromatic object-colour manifold is three-dimensional

Research output: Contribution to journalArticle

Abstract

When in shadow, the achromatic object colours appear different from when they are in light. This immediate observation was quantitatively confirmed by Logvinenko and Maloney (2006, Perception & Psychophysics, 68, 76–83) who, using multidimensional scaling (MDS), showed the two-dimensionality of achromatic object colours. As their experiments included only cast shadows, a question arises: is this also the case for attached shadows? Recently, Madigan and Brainard (2014) argued in favour of the negative answer. However, they also failed to confirm the two-dimensionality for cast shadows. To resolve this issue, an experiment was conducted in which observers rated the dissimilarity between achromatic Munsell chips presented in light and in shadows of both types. Specifically, the chips were presented in four conditions: in front in light; at slant in light; in front in shadow; and at slant in shadow.
Original languageEnglish
Pages (from-to)243-268
Number of pages24
JournalPerception
Volume44
Issue number3
DOIs
Publication statusPublished - Mar 2015

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Keywords

  • vision science
  • optics
  • brightness

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