Determining the color appearance of Helmholtz-Kohlrausch effect for self-emissive displays

Park, YungKyung

doi:10.1080/15980316.2022.2077849

Cited by 7 publications

(7 citation statements)

References 16 publications

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“…[3,4] Recently, there are several studies to predict color appearance considering the H-K effect, but the proposed models are not standardized yet. [5,6] Thus, CIE200 was adopted to quantify the H-K effect in this study. To verify the amount of H-K effect, the equivalent luminance (Leq) is calculated for each ROI.…”

Section: Step2 Conversion From Xyz To Xyzeqmentioning

confidence: 99%

P‐168: Threshold Estimation Experiment of color difference between on‐axis and off‐axis using various complex images

Ha,

Lee,

Choi

et al. 2023

Symp Digest of Tech Papers

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The color appearance of the complex images and that of the color patches are able to be different, especially for the color difference threshold. The color difference prediction method was proposed to predict the color difference of the complex images depending on the viewing angles. In addition, to find the color difference threshold of the complex images, a psychophysical experiment was proposed with 26 people. According to the experiment result, the color difference threshold of the complex images differs depending on the content, and it is higher that of the color patches.

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Section: Step2 Conversion From Xyz To Xyzeqmentioning

confidence: 99%

P‐168: Threshold Estimation Experiment of color difference between on‐axis and off‐axis using various complex images

Ha,

Lee,

Choi

et al. 2023

Symp Digest of Tech Papers

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“…There is currently renewed interest in modelling the H‐K effect. Park 12 has investigated its impact on the very saturated colors that can be generated using wide‐gamut and high‐luminance OLED displays. Hellwig et al 13 have revisited several previous datasets, and propose a new extension to their refinement of CAM16 14 …”

Section: Introductionmentioning

confidence: 99%

The Helmholtz‐Kohlrausch effect on display‐based light colors and simulated substrate colors

High

Green

Nussbaum

2023

Color Research & Application

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The Helmholtz-Kohlrausch (H-K) effect is investigated in relation to light colors of every hue, including those typical of print substrate colors that might be simulated on a graphic arts display. A method of adjustment is used in conjunction with a soft-proof setup, in which an achromatic stimulus is adjusted until it has the same lightness appearance as a set of test colors. Higher chroma colors are found to appear lighter than their metric L Ã would indicate.The H-K effect is found to be quite strong in bluish colors, but negligible in yellowish colors, consistent with several previous studies. However, qualitative analysis reveals a peak H-K effect in red-magenta hues. We propose a modification to Fairchild and Pirrotta's existing H-K lightness appearance function 1 which addresses the peak in red hues, and which may prove beneficial in huedependent applications.

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“…The standard method for experimentally measuring the brightness of stimuli in a manner that is sensitive to the Helmholtz‐Kohlrausch (H‐K) effect is direct brightness matching 9–12 . (Some recent papers interested in building new color appearance models have also used magnitude estimation to quantify the H‐K effect 13–15 …”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12] (Some recent papers interested in building new color appearance models have also used magnitude estimation to quantify the H-K effect. [13][14][15] ) In traditional direct brightness matching experiments, observers are presented with a fixed chromatic stimulus (the reference patch) and adjust the luminance of a spatially non-adjacent achromatic stimulus (the test patch) until it matches the brightness of the reference patch. Repeating this achromatic patch adjustment for a variety of hues, chromas, and lightnesses of the reference patch provides the researcher with a data set of chromaticachromatic stimuli pairs that have equal brightness to which they can fit formulas for lightness and brightness that includes the H-K effect.…”

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confidence: 99%

“…to predict H-K compensated lightness, J HK , where J is the achromatic lightness of a stimulus, C is its chroma, which is raised to a fitted constant k, and f h ð Þ is fitted dependency on hue angle, h. 12,14,15,17 Sometimes an additional factor, f 2 J ð Þ, dependent on the lightness of the stimulus, is multiplied to C as well, 11 and some models use achromatic brightness Q and colorfulness M, instead of J and C, in order to predict H-K compensated brightness, Q HK . 13,14 However, there is no theoretical or empirical basis for the form of Equation 1 other than that it does a sufficient job of fitting each researcher's data.…”

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confidence: 99%

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The brightness of chromatic stimuli

Hellwig,

Stolitzka,

Fairchild

2023

Color Research & Application

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We present the results of a series of three brightness‐matching experiments which include a key refinement in this established psychophysical method. Constraining the chroma difference between pairs of stimuli matched in brightness allows us to use a novel calculus‐based approach to building a model of the brightness of chromatic visual stimuli and the Helmholtz‐Kohlrausch effect. The proposed models, compatible with the CIECAM16 color appearance model and CIELAB color space, are compared to other models of the Helmholtz‐Kohlrausch effect on these data and other past brightness‐matching studies. The proposed CIECAM16‐based model demonstrates the overall best performance on predicting the Helmholtz‐Kohlrausch effect in four newer data sets but overpredicts the weaker effect reported in three older data sets. The potential experimental factors in this divide between new and old studies are also discussed.

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Determining the color appearance of Helmholtz-Kohlrausch effect for self-emissive displays

Cited by 7 publications

References 16 publications

P‐168: Threshold Estimation Experiment of color difference between on‐axis and off‐axis using various complex images

P‐168: Threshold Estimation Experiment of color difference between on‐axis and off‐axis using various complex images

The Helmholtz‐Kohlrausch effect on display‐based light colors and simulated substrate colors

The brightness of chromatic stimuli

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