Color Constancy and Contextual Effects on Color Appearance

Olkkonen, Maria; Ekroll, Vebjørn

doi:10.1007/978-3-319-44978-4_6

Cited by 15 publications

(13 citation statements)

References 179 publications

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“…For this reason, the visual system adjusts its processing of the retinal image across changes in illumination, to maintain relatively stable perception of object colors (Brainard & Radonjić, 2014 ). Our understanding of the processes that underlie this color constancy is mostly based on studies that measure perceived object color across changes in illumination (Hurlbert, 1998 ; Olkkonen & Ekroll, 2016 ; Smithson, 2005 ).…”

Section: Introductionmentioning

confidence: 99%

Illumination discrimination in the absence of a fixed surface-reflectance layout

et al. 2018

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Previous studies have shown that humans can discriminate spectral changes in illumination and that this sensitivity depends both on the chromatic direction of the illumination change and on the ensemble of surfaces in the scene. These studies, however, always used stimulus scenes with a fixed surface-reflectance layout. Here we compared illumination discrimination for scenes in which the surface reflectance layout remains fixed (fixed-surfaces condition) to those in which surface reflectances were shuffled randomly across scenes, but with the mean scene reflectance held approximately constant (shuffled-surfaces condition). Illumination discrimination thresholds in the fixed-surfaces condition were commensurate with previous reports. Thresholds in the shuffled-surfaces condition, however, were considerably elevated. Nonetheless, performance in the shuffled-surfaces condition exceeded that attainable through random guessing. Analysis of eye fixations revealed that in the fixed-surfaces condition, low illumination discrimination thresholds (across observers) were predicted by low overall fixation spread and high consistency of fixation location and fixated surface reflectances across trial intervals. Performance in the shuffled-surfaces condition was not systematically related to any of the eye-fixation characteristics we examined for that condition, but was correlated with performance in the fixed-surfaces condition.

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Section: Introductionmentioning

confidence: 99%

Illumination discrimination in the absence of a fixed surface-reflectance layout

et al. 2018

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“…The visual system processes the retinal image to stabilize object color against changes in the spectrum of the illumination, a fact called color constancy [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

The perception of color and material in naturalistic tasks

Brainard

Cottaris

Radonjić

2018

Preprint

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Perceived object color and material properties help us to select and interact with objects. Because there is no simple mapping between the pattern of an object's image on the retina and its physical reflectance, our perception of color and material are made more useful through sophisticated visual computations. A long-standing goal in vision science is to describe how these computations work, particularly as they act to stabilize perceived color and material against variation in scene factors extrinsic to object surface properties, such as the illumination. If we take seriously the notion that perceived color and material are useful because they help guide behavior in natural tasks, then we need experimental that measure and models that describe how they are used in such tasks. To this end, we have developed selection-based methods and accompanying perceptual models for studying perceived object color and material. This focused review highlights key aspects of our work. It includes a discussion of future directions and challenges, as well as an outline of a computational observer model that incorporates early, known, stages of visual processing and that clarifies how early vision shapes selection performance. BrainardColor and Material

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“…Of the many colour phenomena studied by psychologists, constancy has been particularly significant for philosophers. Colour constancy is the tendency for the perceived colour of a surface to remain fairly stable in spite of fluctuations in the incident illumination (Olkkonen & Ekroll, ; Smithson, ). Part of the importance is due to constancy appearing in arguments for colour realism.…”

Section: Philosophy Of Colour and The Special Sciencesmentioning

confidence: 99%

Naturalism and the philosophy of colour ontology and perception

Chirimuuta

2020

Philosophy Compass

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Color Constancy and Contextual Effects on Color Appearance

Cited by 15 publications

References 179 publications

Illumination discrimination in the absence of a fixed surface-reflectance layout

Illumination discrimination in the absence of a fixed surface-reflectance layout

The perception of color and material in naturalistic tasks

Naturalism and the philosophy of colour ontology and perception

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