Asymmetrical contrast effects induced by luminance and color configurations

Dresp, Birgitta; Fischer, Stéphane

doi:10.3758/bf03194539

Cited by 21 publications

(36 citation statements)

References 25 publications

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“…His intuition that distinct object borders influence our perception of color and contrast is consistent with studies showing interactions between color appearance and the spatial profile of surface contours, or the geometric configuration of the visual display (Devinck et al, 2006;De Weert and Spillmann, 1995;Dresp and Fischer, 2001;Fach and Sharpe, 1986;Pinna, 2008Pinna, , 2011Pinna and Reeves, 2006).…”

Section: Introductionsupporting

confidence: 55%

“…He therein defined what later has become known as simultaneous color contrast (e.g. Beck, 1966;De Weert, 1984;De Weert and Spillmann, 1995;Dresp and Fischer, 2001;Gerrits and Vendrik, 1970;Heinemann, 1955;Helson, 1963;Pinna, 2008;Shapley and Reid, 1985) or color context effects (e.g. Long and Purves, 2003;Reeves et al, 2008;Shevell and Kingdom, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Brightness and Apparent Depth from True Colors on Grey: Chevreul Revisited

Dresp-Langley

Reeves²

2012

Seeing and Perceiving

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We show that true colors as defined by Chevreul (1839) produce unsuspected simultaneous brightness induction effects on their immediate grey backgrounds when these are placed on a darker (black) general background surrounding two spatially separated configurations. Assimilation and apparent contrast may occur in one and the same stimulus display. We examined the possible link between these effects and the perceived depth of the color patterns which induce them as a function of their luminance contrast. Patterns of square-shaped inducers of a single color (red, green, blue, yellow, or grey) were placed on background fields of a lighter and a darker grey, presented on a darker screen. Inducers were always darker on one side of the display and brighter on the other in a given trial. The intensity of the grey backgrounds varied between trials only. This permitted generating four inducer luminance contrasts, presented in random order, for each color. Background fields were either spatially separated or consisted of a single grey field on the black screen. Experiments were run under three environmental conditions: dark-adaptation, daylight, and rod-saturation after exposure to bright light. In a first task, we measured probabilities of contrast, assimilation, and no effect in a three-alternative forced-choice procedure (background appears brighter on the 'left', on the 'right' or the 'same'). Visual adaptation and inducer contrast had no significant influence on the induction effects produced by colored inducers. Achromatic inducers produced significantly stronger contrast effects after dark-adaptation, and significantly stronger assimilation in daylight conditions. Grouping two backgrounds into a single one was found to significantly decrease probabilities of apparent contrast. Under the same conditions, we measured probabilities of the inducers to be perceived as nearer to the observer (inducers appear nearer on 'left', on 'right' or the 'same'). These, as predicted by Chevreul's law of contrast, were determined by the luminance contrast of the inducers only, with significantly higher probabilities of brighter inducers to be seen as nearer, and a marked asymmetry between effects produced by inducers of opposite sign. Implications of these findings for theories which attempt to link simultaneous induction effects to the relative depth of object surfaces in the visual field are discussed.

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Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Simultaneous Brightness and Apparent Depth from True Colors on Grey: Chevreul Revisited

Dresp-Langley

Reeves²

2012

Seeing and Perceiving

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“…The contrast polarity of the red stimuli was varied to test for possible functional asymmetries between bright and dark in the perception of ''near'' in colored figures (e.g., Dresp & Fischer, 2001) with varying luminance contrast. Previously, Dresp et al (2002) have shown that ''near'' percepts in pairs of achromatic figures were not affected by whether a dark figure overlapped a bright one, or a bright figure overlapped a dark one.…”

Section: The Contribution Of Color Stereopsismentioning

confidence: 99%

“…A measurement of 12 cd/m 2 was found to be close enough to individual points of psychophysical isoluminance for the three colors. Psychophysical isoluminance had been assessed beforehand by two separate procedures consisting of a classic flicker test on the one hand and of minimally distinct border adjustments on the other, as in Dresp and Fischer (2001). In the present experimental display, psychophysical isoluminance varied between 11.82 cd/m 2 and 12.54 cd/m 2 for green, and between 12.22 cd/m 2 and 13.01 cd/m 2 for red when testing for green/red isoluminance.…”

Section: Stimulimentioning

confidence: 99%

Interaction of color and geometric cues in depth perception: When does ?red? mean ?near??

Guibal

Dresp

2004

Psychological Research

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Luminance and color are strong and self-sufficient cues to pictorial depth in visual scenes and images. The present study investigates the conditions under which luminance or color either strengthens or overrides geometric depth cues. We investigated how luminance contrast associated with the color red and color contrast interact with relative height in the visual field, partial occlusion, and interposition to determine the probability that a given figure presented in a pair is perceived as ''nearer'' than the other. Latencies of ''near'' responses were analyzed to test for effects of attentional selection. Figures in a pair were supported by luminance contrast (Experiment 1) or isoluminant color contrast (Experiment 2) and combined with one of the three geometric cues. The results of Experiment 1 show that the luminance contrast of a color (here red), when it does not interact with other colors, produces the same effects as achromatic luminance contrasts. The probability of ''near'' increases with the luminance contrast of the color stimulus, the latencies for ''near'' responses decrease with increasing luminance contrast. Partial occlusion is found to be a strong enough pictorial cue to support a weaker red luminance contrast. Interposition cues lose out against cues of spatial position and partial occlusion. The results of Experiment 2, with isoluminant displays of varying color contrast, reveal that red color contrast on a light background supported by any of the three geometric cues wins over green or white supported by any of the three geometric cues. On a dark background, red color contrast supported by the interposition cue loses out against green or white color contrast supported by partial occlusion. These findings reveal that color is not an independent depth cue, but is strongly influenced by luminance contrast and stimulus geometry. Systematically shorter response latencies for stronger ''near'' percepts demonstrate that selective visual attention reliably detects the most likely depth cue combination in a given configuration.

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“…For example, it has been shown (Reid & Shapley, 1988) that local contrast is very important in brightness perception, since it determines brightness induction-that is, it makes an object appear brighter on a background of lower luminance and darker on a background of greater luminance. Similarly, Dresp and Fischer (2001) showed that contrast, rather than contrast polarity, is the important factor in the integration of inducing stimuli in a Kaniza's square configuration to produce perceptual filling in. On the contrary, we have shown the contrast has only a limited role in the spatial interaction between noncollinear edges.…”

Section: Discussionmentioning

confidence: 99%

The influence of contrast and spatial factors in the perceived shape of boundaries

Roncato

Casco

2003

Perception & Psychophysics

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Asymmetrical contrast effects induced by luminance and color configurations

Cited by 21 publications

References 25 publications

Simultaneous Brightness and Apparent Depth from True Colors on Grey: Chevreul Revisited

Simultaneous Brightness and Apparent Depth from True Colors on Grey: Chevreul Revisited

Interaction of color and geometric cues in depth perception: When does ?red? mean ?near??

The influence of contrast and spatial factors in the perceived shape of boundaries

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