Effect of chromatic adaptation on the achromatic locus: The role of contrast, luminance and background color

Werner, John S.; Walraven, Jan

doi:10.1016/0042-6989(82)90029-3

Cited by 93 publications

(65 citation statements)

References 33 publications

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“…This is what Werner and Walraven (1982) hypothesized and found empirical evidence for. In fact, our observers did not report any systematic deviations from this finding.…”

Section: _ -----------supporting

confidence: 60%

“…This was most obvious for the yellow/ blue channel, whereas the deviations for the red/green channel were rather small. Interestingly, quite similar in a number of other studies (Cicerone et aI., 1975;Werner & Walraven, 1982) that held local adaptations small; thus, it appeared to be an adequate starting point for testing. Second, the present study used equilibrium configurations to test the principle.…”

Section: _ -----------mentioning

confidence: 51%

“…There is evidence that such conditions are met in the present study. For several adaptation conditions, Werner and Walraven (1982) found the achromatic locus to lie on a straight line in color space connecting the neutral achromatic locus with the respective adaptation locus. This finding implies that the achromatic loci for adaptation to yellow and blue fallon the straight-line yellow-blue.…”

Section: Chromatic Adaptation Sessionsmentioning

confidence: 99%

“…Thus, a different second postreceptoral opponent channel is chosen. On the basis of unique green's Abney hue invariance and Bezold-Briicke invariance (Bums, Elsner, Pokorny, & Smith, 1984;Larimer et aI., 1975;Purdy, 1931), and of Werner and Walraven's (1982) finding that the achromatic locus falls on a straight line in color space, a plane in color space is defined by extrapolating the plane unique green-white linearly to the reddish part of color space. The resulting plane's surface in color space is taken to define the equilibria for a linear yellow/blue channel.…”

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confidence: 99%

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A ratio principle for a red/green and a yellow/blue channel?

Bäuml

1993

Perception & Psychophysics

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There is strong empirical evidence that, under adaptation to another achromatic color stimulus, the lightness of an achromatic color stimulus depends on the ratio of the luminances of the two stimuli. In the present study, the suitability of this ratio principle is tested for two chromatic postreceptoral opponent channels. A Hering red/green channel and a non-Hering yellow/blue channel are specified as chromatic channels. The yellow/blue channel is defined by extrapolating the plane corresponding to unique green-white linearly to the reddish part of color space, using the plane's surface as the channel's equilibria. The experiment was run on an isoluminant plane, measured individually for each observer. Moving along an observer's measured opponent axes, eight adaptation stimuli were selected for each channel and spanned the whole range ofthe channel's coordinates. Red/green equilibria or yellow/blue equilibria were measured as excursions along the adaptation axes. For both presumed channels, the ratios of the equilibrium coordinates of test and adaptation stimuli were essentially constant. This supports the principle's suitability. However, small asymmetries were found with respect to each channel's opponent hues. The status of the proposed yellow/blue channel is discussed, as are conditions that might have favored the present findings.

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“…This is what Werner and Walraven (1982) hypothesized and found empirical evidence for. In fact, our observers did not report any systematic deviations from this finding.…”

Section: _ -----------supporting

confidence: 60%

Section: _ -----------mentioning

confidence: 51%

Section: Chromatic Adaptation Sessionsmentioning

confidence: 99%

mentioning

confidence: 99%

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A ratio principle for a red/green and a yellow/blue channel?

Bäuml

1993

Perception & Psychophysics

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“…The variation of white is more affected by the processing of colours along the blue-yellow direction, rather than the red-green direction. [14][15][16] Thus, screening for red-green vision deficiencies with the pseudoisochromatic test alone will only serve to inform prospective students if it is likely that they have CVD. Some red-green colour deficient individuals, however, perform as well as those with normal colour vision when discriminating colours under test conditions that are more naturalistic than standardised tests for colour vision deficiencies.…”

Section: In Briefmentioning

confidence: 99%