scholarly journals Observer metamerism to display white point between LCD and OLED displays

2020 ◽  
Vol 2020 (28) ◽  
pp. 366-369
Author(s):  
Minchen Wei ◽  
Yu Hu ◽  
Ming Ronnier Luo
Keyword(s):  
Color Appearance ◽  
Imaging Systems ◽  
Color Matching ◽  
Lcd Display ◽  
White Point ◽  
Perceived Color ◽  
Oled Display

Displays with different primary sets were found to introduce perceived color mismatch between pairs that are computationally metameric and to affect the degree of observer metamerism. OLED display is becoming more and more popular than LCD display in different imaging systems. In this study, human observers used an LCD and eight OLED displays to match the color appearance of a D 70 white stimulus produced by a spectrally tunable LED device. It was found the chromaticities of the LCD display were significantly different from those of the OLED displays to achieve a match. When the colors were adjusted to have matched appearance, the chromaticities of the OLED displays were always shifted towards closer to the blackbody locus using the CIE 1931 Color Matching Functions (CMFs). The results also suggested that the CIE 2006 2° Color Matching Functions had the best performance.

Change of color appearance due to extremely high light level: corresponding colors under 100 and 3000 cd/m2

2019 ◽  
Vol 2019 (1) ◽  
pp. 320-325 ◽  
Author(s):  
Wenyu Bao ◽  
Minchen Wei
Keyword(s):  
Light Level ◽  
Limited Range ◽  
High Light ◽  
Color Preference ◽  
Color Appearance ◽  
Appearance Model ◽  
Color Matching ◽  
Light Levels ◽  
Appearance Models ◽  
Psychophysical Study

Great efforts have been made to develop color appearance models to predict color appearance of stimuli under various viewing conditions. CIECAM02, the most widely used color appearance model, and many other color appearance models were all developed based on corresponding color datasets, including LUTCHI data. Though the effect of adapting light level on color appearance, which is known as "Hunt Effect", is well known, most of the corresponding color datasets were collected within a limited range of light levels (i.e., below 700 cd/m2), which was much lower than that under daylight. A recent study investigating color preference of an artwork under various light levels from 20 to 15000 lx suggested that the existing color appearance models may not accurately characterize the color appearance of stimuli under extremely high light levels, based on the assumption that the same preference judgements were due to the same color appearance. This article reports a psychophysical study, which was designed to directly collect corresponding colors under two light levels— 100 and 3000 cd/m2 (i.e., ≈ 314 and 9420 lx). Human observers completed haploscopic color matching for four color stimuli (i.e., red, green, blue, and yellow) under the two light levels at 2700 or 6500 K. Though the Hunt Effect was supported by the results, CIECAM02 was found to have large errors under the extremely high light levels, especially when the CCT was low.

Modeling color preference for different color appearance modes based on perceived color attributes

2010 ◽  
Vol 17 (4) ◽  
pp. 425-434
Author(s):  
Uravis Tangkijviwat ◽  
Hiroyuki Shinoda ◽  
Kitirochna Rattanakasamsuk
Keyword(s):  
Color Preference ◽  
Color Appearance ◽  
Different Color ◽  
Perceived Color

Comparison of remote and in-person tutorials of color appearance phenomena

2021 ◽  
Vol 2021 (29) ◽  
pp. 387-393
Author(s):  
Dorukalp Durmus
Keyword(s):  
Science Education ◽  
Digital Imaging ◽  
Human Visual System ◽  
Color Appearance ◽  
Imaging Systems ◽  
Alternative Methods ◽  
Color Experience ◽  
Color Science ◽  
Digital Imaging Systems ◽  
The Difference

Accurately describing the effect of lighting on color appearance phenomena is critical for color science education. While it is ideal to conduct in-person tutorials to demonstrate the color appearance fundamentals, laboratory tutorials have been limited due to COVID-19. The limitation of in-person gatherings and the increase popularity of remote teaching help evoke alternative methods to demonstrate color appearance phenomena. Here, a remote tutorial method is described, and results are compared to in-person tutorials. While the remote tutorial had weaker result in representing observers' color experience compared to the in-person lab tutorial, remote demonstrations can be used to demonstrate and discuss the limitations of color imaging, and the difference between the human visual system and digital imaging systems.

Establishment and Evaluation of Color Appearance Datasets about Packaging and Printing Atlas of High Gloss

2013 ◽  
Vol 469 ◽  
pp. 269-272
Author(s):  
Jing Liang ◽  
Yu Tong Piao ◽  
Ning Fang Liao
Keyword(s):  
Correlation Coefficient ◽  
Coefficient Of Variation ◽  
Color Appearance ◽  
Mathematical Statistics ◽  
Light Sources ◽  
Color Matching ◽  
Coated Paper ◽  
Science Field ◽  
Color Science ◽  
Color Printing

The prediction of color appearance is the basic theory and technology in modern color science field. The aim of this study is to evaluate the color appearance of packaging and printing atlas. This paper took high gloss double-sided coated paper color printing atlas as the experimental samples. The color samples are measured using ACS color-matching instrument under different light sources (D65, A and TL84), then based on color science and visual psychophysics methods, establishing the datasets of the samples’ color appearance. We use mathematical statistics methods, correlation coefficient R2 and coefficient of variation CV, to evaluate the visual prediction results in the color atlas, under three different light sources.

Cone contrasts do not predict color constancy

2006 ◽  
Vol 23 (3-4) ◽  
pp. 543-547 ◽  
Author(s):  
I.J. MURRAY ◽  
A. DAUGIRDIENE ◽  
R. STANIKUNAS ◽  
H. VAITKEVICIUS ◽  
J.J. KULIKOWSKI
Keyword(s):  
Visual System ◽  
Color Space ◽  
Color Constancy ◽  
Color Matching ◽  
Physical Background ◽  
The Stability ◽  
Perceived Color ◽  
Brunswik Ratio ◽  
Cone Adaptation

A successive, asymmetric color-matching paradigm was used to investigate the link between cone contrast and the stability of perceived colors. We measured the perceived color shifts of 10 Munsell samples, induced by test illuminant A, simulated in u′v′ color space. The capacity of the visual system to resist these shifts, otherwise known as color constancy, is measured in terms of the Brunswik ratio, BR. Cone contrasts are calculated with respect to either the physical or perceived background. Subjective cone contrasts show a better fit to the von Kries law than those based on the physical background. Complete cone adaptation occurs when color constancy is high. However we show conditions where cone adaptation seems complete but color constancy is poor.

scholarly journals Large enhancement of simultaneous color contrast by white flanking contours

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Tama Kanematsu ◽  
Kowa Koida
Keyword(s):  
Luminance Contrast ◽  
Color Appearance ◽  
Color Contrast ◽  
Contrast Effects ◽  
Dark Line ◽  
Yellow Color ◽  
Color Shift ◽  
Third Law ◽  
Simultaneous Color Contrast ◽  
Perceived Color

AbstractSimultaneous color contrast and assimilation are mutually opposing effects on color appearance, and their magnitude depends on spatial context. The Monnier–Shevell illusion induces a large color shift by a synergy of simultaneous assimilation and contrast using the alternating color of proximal and distant surrounds. The illusion induces a prominent effect along the blue-yellow color axis, but a subtle effect along the orthogonal color axis. In this study, we report an illusion generated by an extremely thin gray line on a cyan background that appears reddish when the line is flanked by thin white contours. We quantified the color appearance of the gray line in a color matching experiment and found that the color shift of the gray line with white contours induced large color shifts. It is also known that luminance contrast between a center and its surrounds affects the magnitude of simultaneous color contrast. However, our color contrast effects were larger for a dark line rather than for a pale line. In contrast, the perceived color shift of the line without the contours increased as the luminance of the gray line increased, supporting the known effect of Kirschmann’s third law. These results indicate that Kirschmann’s third law fails to explain the perceived color shift of our illusion, even after accounting for optical factors like aberrations. Observed color shifts could be explained by an augmented synergy theory based on intensity space, rather than chromaticity.

scholarly journals A simple method for comparing peripheral and central color vision by means of two smartphones

2021 ◽  
Author(s):  
Galina I. Rozhkova ◽  
Alexander V. Belokopytov ◽  
Maria A. Gracheva ◽  
Egor I. Ershov ◽  
Petr P. Nikolaev
Keyword(s):  
Peripheral Vision ◽  
Classical Method ◽  
Color Space ◽  
Color Appearance ◽  
Color Matching ◽  
Experimental Conditions ◽  
Simple Method ◽  
Technical Realization ◽  
Wide Range ◽  
Maxwellian View

AbstractInformation on peripheral color perception is far from being sufficient since it was predominantly obtained using small stimuli, limited ranges of eccentricities, and sophisticated experimental conditions. Our purpose was to consider a possibility of facilitating technical realization of the classical method of asymmetric color matching (ACM) developed by Moreland and Cruz (1959) for assessing appearance of color stimuli in the peripheral visual field (VF). We adopted the ACM method by employing two smartphones to implement matching procedure at various eccentricities. Although smartphones were successfully employed in vision studies, we are aware that some photometric parameters of smartphone displays are not sufficiently precise to ensure accurate color matching in foveal vision; moreover, certain technical characteristics of commercially available devices are variable. In the present study we provide evidence that, despite these shortages, smartphones can be applied for general and wide investigations of the peripheral vision. In our experiments, the smartphones were mounted on a mechanical perimeter to simultaneously present colored stimuli foveally and peripherally. Trying to reduce essential discomfort and fatigue experienced by most observers in peripheral vision studies, we did not apply bite bars, pupil dilatation, and Maxwellian view. The ACM measurements were performed without prior training of observers and in a wide range of eccentricities, varying between 0 and 95°. Color appearance was measured in the HSV color space coordinates as a function of eccentricity and stimulus luminance. We demonstrate that our easy-to-conduct method provides a reliable means to estimate color appearance in the peripheral vision and to assess inter-individual differences.

Temporary Tritanopia: Effects of cataract surgery on color

2019 ◽  
Vol 2019 (1) ◽  
pp. 201-206
Author(s):  
John J. McCann ◽  
Mary A. McCann
Keyword(s):  
Pilot Study ◽  
Cataract Surgery ◽  
Color Vision ◽  
Color Discrimination ◽  
Color Appearance ◽  
Color Matching ◽  
Bilateral Cataract ◽  
Normal Color Vision ◽  
Test Color ◽  
Visual Measurements

This pilot study made a wide variety of visual measurements before, during, and after bilateral cataract surgery. This article describes the changes in color discrimination and color appearance resulting from cataract implants. It used the F-M 100 Hue Test, color matching of real scenes, and color-balance titration measurements. The pre-surgery data indicated that the previously normal color observers had severe tritanopic anomalies. Lens replacement restored normal color vision.

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