A comparison of lightness contrast effects in CRT and surface colours

Wu, Ray Chin; Wardman, Roger; Luo, Ming Ronnier

doi:10.1002/col.20074

Cited by 12 publications

(13 citation statements)

References 15 publications

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“…The detailed procedure and the colours used have been described previously. 13 The experimental set up is shown diagrammatically in Fig. 1, and the experiments were conducted in a darkened room.…”

Section: Methodsmentioning

confidence: 99%

“…The data reported previously 13 were used to evaluate the performance of the Hunt94 and CIECAM02-m1 colour appearance models. The data set comprised two sets of tristimulus values, which specified the colour appearance of the stimuli (test colours) that matched each other in two different viewing conditions according to the assessments of observers.…”

Section: Testing Colour Appearance Modelmentioning

confidence: 99%

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Proposed modification to the CIECAM02 colour appearance model to include the simultaneous contrast effects

Wardman

2007

Color Research & Application

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A modified CIECAM02 colour appearance model, named CIECAM02-m2, is proposed to enable CIE-CAM02 to predict the simultaneous contrast effect. The structure of the CIECAM02-m2 is a development from CIECAM02, and contains two different procedures for modifying the reference white; one is for lightness and the other is for hue. The model was tested using a data set accumulated in this study and the LUTCHI data. The CV values for three colour attributes between predictions and experimental data were used to evaluate the accuracy of the model. The low CV values obtained show the performance of the CIECAM02-m2 model to predict the simultaneous contrast effect satisfactorily.

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Section: Methodsmentioning

confidence: 99%

Section: Testing Colour Appearance Modelmentioning

confidence: 99%

Proposed modification to the CIECAM02 colour appearance model to include the simultaneous contrast effects

Wardman

2007

Color Research & Application

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“…The intensity of the effect is presented by calculated colorimetric color differences [18]. Psychophysical research primarily seeks to determine whether the respondent can detect a particular stimulus and compare it with another stimulus and describe the differences [21].…”

Section: Experimental Partmentioning

confidence: 99%

“…The goal of every visual psychophysical research is to identify and define a perceptually determined response of the test subject induced by the stimulus of precisely defined physical characteristics that are instrumentally measurable [17,18]. The paper presents the results of the research on the background psychophysical effect of induction or simultaneous contrast.…”

Section: Introductionmentioning

confidence: 99%

The intensity of the simultaneous contrast effect depending on the change of background lightness

2016

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Original scientific paper The paper explores the influence of the background effect of induction or simultaneous contrast on a specific type of media during the reproduction of a constructed design solution. The lightness of the background that surrounds the primary stimulus (rectangle) on a specifically constructed design was varied in ten ways. The intensity and direction of variations in the manifestation of lightness was determined with the help of the technique of simultaneous binocular harmonization on a certain number of respondents (10). The ANOVA analysis determined the existence of differences between arithmetic means (F = 132,50; p = 0,000), and the post-hoc analysis by Fisher classified three groups of samples: samples on which simultaneous contrast reflects more strongly (a very dark background); samples on which the effect is weaker (a light background); and samples on which the effect is manifested in the opposite direction (a very bright background). Keywords: achromatic reproduction; ANOVA; psychophysics; simultaneous contrast Intenzitet efekta simultanog kontrasta u ovisnosti o promjeni svjetline pozadineIzvorni znanstveni članak U radu je istražen utjecaj pozadinskog efekta indukcije ili simultanog kontrasta na određenoj vrsti medija prilikom reprodukcije konstruiranog dizajnerskog rješenja. Pritom je na 10 načina varirana svjetlina pozadine koja okružuje primarni stimulus (pravokutnik) na specifično konstruiranom dizajnu. Utvrđen je intenzitet i smjer odstupanja u pojavnosti svjetline pomoću tehnike simultanog binokularnog usuglašavanja na određenom broju ispitanika (10). ANOVA analizom utvrđeno je postojanje razlika među aritmetičkim sredinama (F = 132,50; p = 0,000) te su post-hoc analizom po Fisheru klasificirane tri grupe uzoraka: uzorci na kojima se simultani kontrast očituje jače (vrlo tamna pozadina); uzorci na kojima je efekt slabiji (svjetlija pozadina); te uzorci na kojima se efekt manifestira u suprotnom smjeru (vrlo svijetla pozadina).

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“…The idea of visual psychophysical research is to identify and define a particular perceptual reaction of the respondent induced by the stimuli of precisely defined physical characteristics that are instrumentally measurable [25]. The paper presents the results of the research on the background psychophysical effect of crispening.…”

Section: Introductionmentioning

confidence: 99%

The intensity of the background visual effect of crispening depending on background lightness

2017

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Preliminary communicationThe paper presents the results of a research of the background visual effect of crispening depending on background lightness. A research on graphic reproductions with specifically designed solutions that involve the mentioned effect was conducted. Reproductions were designed through the variations of four different types of background lightness of 25%, 50%, 75% and 100% RTV (secondary stimuli), on which there are internal rectangles of lightness of 45%, 50% and 55% RTV (primary stimuli). The visual experiment was carried out through the use of the technique of simultaneous binocular harmonization with 10 respondents. The ANOVA with repeated measures revealed statistical differences between the arithmetic means of variations in lightness for four variations of the background in all three primary stimuli. Further post-hoc analysis by Fisher identified the groups that mutually differ. The results indicate the regularities to which the effect of crispening is subjected in the selected graphic medium. The research was conducted with the aim of standardizing the printing process during the appearance of crispening effect in real conditions of graphic production. Key words: achromatic reproduction; ANOVA; crispening; psychophysics Intenzitet pozadinskog vizulnog efekta nabiranja ovisno o svjetlini pozadinePrethodno priopćenje U radu su prezentirani rezultati istraživanja pozadinskog vizualnog efekta nabiranja u ovisnosti o svjetlini pozadine. Provedeno je istraživanje na grafičkim reprodukcijama sa specifično konstruiranim rješenjima u kojima se javlja spomenuti efekt. Reprodukcije su dizajnirane putem varijacija 4 različite pozadine svjetlina 25%, 50%, 75% i 100% RTV (sekundarni stimulus), na kojima se nalaze unutrašnji pravokutnici svjetlina 45%, 50% i 55% RTV (primarni stimulusi). Vizualni eksperiment proveden je upotrebom tehnike simultanog binokularnog usuglašavanja sa 10 ispitanika. ANOVOM s ponovljenim mjerenjima utvrđene su statističke razlike među aritmetičkim sredinama odstupanja u svjetlinama za 4 varijacije pozadine i to kod sva 3 primarna stimulusa. Daljnjom post-hoc analizom po Fisheru identificirane su grupe koje se međusobno razlikuju. Dobiveni rezultati ukazuju na pravilnosti kojima se podvrgava efekt nabiranja u izabranom grafičkom mediju. Istraživanje je provedeno s ciljem standardizacije tiskarskog procesa prilikom pojavnosti efekta nabiranja u realnim uvjetima grafičke proizvodnje.

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A comparison of lightness contrast effects in CRT and surface colours

Cited by 12 publications

References 15 publications

Proposed modification to the CIECAM02 colour appearance model to include the simultaneous contrast effects

Proposed modification to the CIECAM02 colour appearance model to include the simultaneous contrast effects

The intensity of the simultaneous contrast effect depending on the change of background lightness

The intensity of the background visual effect of crispening depending on background lightness

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