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The achromatic locus: Effect of navigation direction in color space
"... An achromatic stimulus is defined as a patch of light that is devoid of any hue. This is usually achieved by asking observers to adjust the stimulus such that it looks neither red nor green and at the same time neither yellow nor blue. Despite the theoretical and practical importance of the achroma ..."
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of the achromatic locus, little is known about the variability in these settings. The main purpose of the current study was to evaluate whether achromatic settings were dependent on the task of the observers, namely the navigation direction in color space. Observers could either adjust the test patch along the two
a reprint from Journal of the Optical Society of America A 531 Color appearance: effects of illuminant changes under different surface collections
, 1993
"... A theory about how changes in the illuminant affect the color appearance of objects must specify how the visual system's adjustments to illuminant changes vary with the surface collection in a scene. I report an experiment designed to investigate this issue. The stimuli were CRT simulations of ..."
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of flat matte surfaces rendered under diffuse illumination. For all combinations of 7 daylight illuminants and 12 collections of surface reflectances the subject's achromatic locus was measured on an isoluminant plane in color space. For any surface collection the changes in the achromatic locus
1 CHANGES IN COLOUR PERCEPTION WITH AGEING
"... Purpose. We assessed chromatic sensitivity along the protan, the deutan, and the tritan line (Cambridge Colour Test, CRS Ltd.), the loci of the unique hues (red, green, yellow, blue) and the achromatic locus (neutral grey) for a very large sample (n=185) of colour-normal observers ranging from 18 to ..."
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Purpose. We assessed chromatic sensitivity along the protan, the deutan, and the tritan line (Cambridge Colour Test, CRS Ltd.), the loci of the unique hues (red, green, yellow, blue) and the achromatic locus (neutral grey) for a very large sample (n=185) of colour-normal observers ranging from 18
Does human color constancy incorporate the statistical regularity of natural daylight
- Journal of Vision
, 2004
"... The chromaticities of natural daylights cluster around the blackbody locus. We investigated whether the mechanisms that mediate human color constancy embody this statistical regularity of the natural environment, so that constancy is best when the illuminant change is one likely to occur. Observers ..."
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Cited by 28 (7 self)
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The chromaticities of natural daylights cluster around the blackbody locus. We investigated whether the mechanisms that mediate human color constancy embody this statistical regularity of the natural environment, so that constancy is best when the illuminant change is one likely to occur. Observers
Vectorial Color
, 2009
"... A set of orthonormal color matching functions is developed, in which the first is an all-positive achromatic function, the second is red-green, and the third can be loosely described as blueyellow. The achromatic function, proportional to the familiar y6, is a sum of red and green cones. The red-gre ..."
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A set of orthonormal color matching functions is developed, in which the first is an all-positive achromatic function, the second is red-green, and the third can be loosely described as blueyellow. The achromatic function, proportional to the familiar y6, is a sum of red and green cones. The red
Color Matching with Amplitude Not Left Out
"... Amplitude for color mixing is different from other amplitudes such as loudness. Color amplitude must refer to a light’s ability to look different from other lights, to express its redness or other chromatic intensity, so that its color is not lost during transduction. To reveal independent stimulus ..."
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that Cohen called “the locus of unit monochromats, ” after he found it by different steps. The locus defines a surface that is interesting but not complicated, which Cohen called “butterfly wings.” Projecting the locus into a plane normal to the achromatic axis gives a boomerang shape with 3 well
Evidence of widespread retinal dysfunction in patients with stargardt disease and morphologically unaffected carrier relatives. Invest Ophthalmol Vis Sci.
, 2008
"... PURPOSE. To characterize contrast sensitivity (CS) across the visual field for two achromatic spatial-temporal frequencies in 21 families with Stargardt disease (STGD) and to correlate psychophysical impairment with patterns of change in multifocal electroretinography (mfERG). METHODS. Twenty-seven ..."
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Cited by 2 (1 self)
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PURPOSE. To characterize contrast sensitivity (CS) across the visual field for two achromatic spatial-temporal frequencies in 21 families with Stargardt disease (STGD) and to correlate psychophysical impairment with patterns of change in multifocal electroretinography (mfERG). METHODS. Twenty
Alouatta Trichromatic Color Vision: Cone Spectra and Physiological Responses Studied with Microspectrophotometry and Single Unit Retinal
"... The howler monkeys (Alouatta sp.) are the only New World primates to exhibit routine trichromacy. Both males and females have three cone photopigments. However, in contrast to Old World monkeys, Alouatta has a locus control region upstream of each opsin gene on the X-chromosome and this might influe ..."
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The howler monkeys (Alouatta sp.) are the only New World primates to exhibit routine trichromacy. Both males and females have three cone photopigments. However, in contrast to Old World monkeys, Alouatta has a locus control region upstream of each opsin gene on the X-chromosome and this might
Effects of chromatic image statistics on illumination induced color differences
, 2013
"... Wemeasure the color fidelity of visual scenes that are rendered under different (simulated) illuminants and shown on a calibrated LCD display. Observers make triad illuminant comparisons involving the renderings from two chromatic test illuminants and one achromatic reference illuminant shown simult ..."
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Wemeasure the color fidelity of visual scenes that are rendered under different (simulated) illuminants and shown on a calibrated LCD display. Observers make triad illuminant comparisons involving the renderings from two chromatic test illuminants and one achromatic reference illuminant shown
Approved by:
, 2006
"... ii iii CHRISTOPHER CHARLES WEIGLE: Displays for Exploration and Comparison of Nested ..."
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ii iii CHRISTOPHER CHARLES WEIGLE: Displays for Exploration and Comparison of Nested
