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Determinants of colour constancy and the blue bias

Determinants of colour constancy and the blue bias
Determinants of colour constancy and the blue bias
We investigated several sensory and cognitive determinants of colour constancy across 40 illumination hues. In the first experiment, we measured colour naming for the illumination and for the colour induced by the illumination on the colorimetric grey. Results confirmed that the induced colours are approximately complementary to the colour of the illumination. In the second experiment, we measured colour constancy using achromatic adjustments. Average colour constancy was perfect under the blue daylight illumination and decreased in colour directions away from the blue daylight illumination due to undershooting and a strong blue bias. Apart from this blue bias, colour constancy was not related to illumination discrimination and to chromatic detection measured previously with the same setup and stimuli. We also observed a strong negative relationship between the degree of colour constancy and the consensus of naming the illumination colour. Constancy coincided with a low naming consensus, in particular because bluish illumination colours were sometimes seen as achromatic. Blue bias and category consensus alone explained >68%, and all determinants together explained >94% of the variance of achromatic adjustments. These findings suggest that colour constancy is optimised for blue daylight.
2041-6695
1-29
Weiss, David
af466adb-fe8e-4393-b676-e2d496657eb3
Witzel, Christoph
dfb994f1-7007-441a-9e1a-ddb167f44166
Gegenfurtner, Karl R.
4a15dafb-60db-41c6-a845-b0f37bee8d3e
Weiss, David
af466adb-fe8e-4393-b676-e2d496657eb3
Witzel, Christoph
dfb994f1-7007-441a-9e1a-ddb167f44166
Gegenfurtner, Karl R.
4a15dafb-60db-41c6-a845-b0f37bee8d3e

Weiss, David, Witzel, Christoph and Gegenfurtner, Karl R. (2017) Determinants of colour constancy and the blue bias. i-Perception, 8 (6), 1-29. (doi:10.1177/2041669517739635).

Record type: Article

Abstract

We investigated several sensory and cognitive determinants of colour constancy across 40 illumination hues. In the first experiment, we measured colour naming for the illumination and for the colour induced by the illumination on the colorimetric grey. Results confirmed that the induced colours are approximately complementary to the colour of the illumination. In the second experiment, we measured colour constancy using achromatic adjustments. Average colour constancy was perfect under the blue daylight illumination and decreased in colour directions away from the blue daylight illumination due to undershooting and a strong blue bias. Apart from this blue bias, colour constancy was not related to illumination discrimination and to chromatic detection measured previously with the same setup and stimuli. We also observed a strong negative relationship between the degree of colour constancy and the consensus of naming the illumination colour. Constancy coincided with a low naming consensus, in particular because bluish illumination colours were sometimes seen as achromatic. Blue bias and category consensus alone explained >68%, and all determinants together explained >94% of the variance of achromatic adjustments. These findings suggest that colour constancy is optimised for blue daylight.

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Published date: 6 December 2017

Identifiers

Local EPrints ID: 438899
URI: http://eprints.soton.ac.uk/id/eprint/438899
ISSN: 2041-6695
PURE UUID: 339d5c50-055c-4bbd-9a44-5a1e7f27bcfd
ORCID for Christoph Witzel: ORCID iD orcid.org/0000-0001-9944-2420

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Date deposited: 26 Mar 2020 17:31
Last modified: 17 Mar 2024 04:00

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Contributors

Author: David Weiss
Author: Karl R. Gegenfurtner

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