Color space and its divisions

Kuehni, Rolf G.

doi:10.1002/col.1018

Cited by 74 publications

(56 citation statements)

References 33 publications

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“…The traditional notion that "the hue of an after-image is determined solely by the hue of the stimulus color" (Wilson & Brocklebank, 1955, p. 299) as it has been already observed by many, not last by von Helmholtz himself and others (Kuehni, 2001;von Helmholtz, 1924) is ill-formulated. Thus, the standard claim that one sees the complementary color of the stimulus is conceptually insufficient because it assumes that the afterimage color is a function of the stimulus color only.…”

Section: Shortcomings Of the Notion Of Complementary Color (Experimenmentioning

confidence: 99%

A Perception-Based Model of Complementary Afterimages

Manzotti

2017

Sage Open

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Complementary afterimages are often modeled as illusory Hering opponent hues generated by the visual system as a result of adaptation. Yet, the empirical evidence suggests a different picture-Complementary afterimages are localized RGB filtered perception based on complementary color pairs. The article aims to bring to the fore an ongoing ambiguity about red/ green afterimages and then to address all cases of complementary afterimages. A simple model of afterimages based both on empirical data and the available literature is reconsidered and discussed: The afterimage color A depends both on the color stimulus S and on the ensuing background color B as estimated by the relation, A = B -kS.

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Section: Shortcomings Of the Notion Of Complementary Color (Experimenmentioning

confidence: 99%

A Perception-Based Model of Complementary Afterimages

Manzotti

2017

Sage Open

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“…As is shown in Roos and Noltemeier [14], dynamic Voronoi diagrams change in an entirely continuous fashion. 10 This geometric continuity ensures that, when all the Voronoi edges/faces and Voronoi points of the separate Voronoi diagrams generated at each particular point in time are projected onto each other, the result is a diagram with a full boundary region. Theorem 4.1 should then be more or less obvious once we realize that, first, because the generator regions are connected, from any selection of points from these regions we can reach any other selection of points from those regions by having all points move along continuous trajectories that lie entirely within the generator regions; and second, we can exhaust the possible selections of points from the generator regions by, so to speak, chaining together infinitely many such operations.…”

Section: R N } Be a Set Of Pairwise Disjoint Regions Of A Givenmentioning

confidence: 99%

Vagueness: A Conceptual Spaces Approach

Douven

Decock²,

Dietz

et al. 2011

J Philos Logic

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The conceptual spaces approach has recently emerged as a novel account of concepts. Its guiding idea is that concepts can be represented geometrically, by means of metrical spaces. While it is generally recognized that many of our concepts are vague, the question of how to model vagueness in the conceptual spaces approach has not been addressed so far, even though the answer is far from straightforward. The present paper aims to fill this lacuna.

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“…A pair of chromaticities separated by a given geometrical distance in the diagram may or may not have the same discriminability as a second pair separated by the same distance, depending on the region of the diagram in which the paired chromaticities lie, the direction in which the individual chromaticities differ and the state of adaptation of the eye [3][4][5][6]. Yet, in many civil and commercial domains, it is important to be able to predict when two samples will be noticeably different in colour; and several linear and nonlinear transformations of the CIE (1931) chromaticity diagram have been introduced, in successive attempts to achieve a 'uniform colour space' in which pairs of colours that are equally discriminable are separated by equal distances [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Rather little known in the modern literature on visual science, but much discussed in the mid-twentieth century by those concerned with practical tolerances for surface colours, is a phenomenon that Judd called the 'super-importance of hue differences' [7,8,10]. Colour differences measured along a radial line in colour space (i.e.…”

Section: Introductionmentioning

confidence: 99%

Superior discrimination for hue than for saturation and an explanation in terms of correlated neural noise

Danilova

Mollon

2016

Proc. R. Soc. B.

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The precision of human colour discrimination depends on the region of colour space in which measurements are made and on the direction in which the compared colours-the discriminanda-differ. Working in a MacLeod-Boynton chromaticity diagram scaled so that thresholds at the white point were equal for the two axes, we made measurements at reference points lying on lines that passed at 458 or 2458 through the white point. At a given reference chromaticity, we measured thresholds either for saturation (i.e. for discriminanda lying radially along the line passing through the white point) or for hue (i.e. for discriminanda lying on a tangent of a circle passing through the reference point and centred on the white point). The discriminanda always straddled the reference point in chromaticity. The attraction of this arrangement is that the two thresholds can be expressed in common units. All that differs between saturation and hue measurements is the phase with which the short-wave signal is combined with the long-/middle-wave signal. Except for chromaticities very close to the white point, saturation thresholds were systematically higher than hue thresholds. We offer a possible explanation in terms of correlated neural noise.

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Color space and its divisions

Cited by 74 publications

References 33 publications

A Perception-Based Model of Complementary Afterimages

A Perception-Based Model of Complementary Afterimages

Vagueness: A Conceptual Spaces Approach

Superior discrimination for hue than for saturation and an explanation in terms of correlated neural noise

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