Perceived Differences of Lightness Deviation during the Appearance of Simultaneous Contrast Effect in Printing Process

Abstract

This paper shows the research data of psychophysical visual effect of simultaneous contrast when changing RTV of background lightness in the printing process. An experimental research on graphic reproductions made in the offset printing technique with specifically constructed design solutions that cause the above mentioned effect was carried out. Samples were designed as ten various lightness variances of background, with a range from 10% RTV to 100% RTV, on which there are primary stimuli with value of 50% RTV. The visual experiment was performed by using simultaneous binocular harmonization technique, and it involved 20 respondents. The respondents were tasked with harmonizing the primary stimuli from the test reproduction in relation to the referential one, so that they were to be perceived as equal on both reproductions. For statistical data processing, one-way repeated measurements ANOVA was used, which found statistically consequential differences among means of deviations in perceived lightness of primary stimuli. Post-hoc analysis by Fisher shows pairs that are reciprocally different (p < 0,05). The obtained results clearly indicate the regularities of the appearance of simultaneous contrast effect on printed medium, all with the aim of creating a model for predicting it and finding a conceptual design solution in which the effect is pronounced the least.

A shift of the perceptual attributes of color due to the manifestation of the simultaneous contrast effect on a display

“…More recently, the simultaneous contrast effect on the shift of perceived lightness of the observer on achromatic samples, depending on the change of the printing substrate, was researched, 23 while in the work of Hajdek et al, the influence of the simultaneous contrast effect depending on the change of background lightness in the reproduction (print) was studied using a color atlas. 24,25 In work Hajdek et al, a comparison of the intensity of the simultaneous contrast effect on achromatic (monochromatic and desaturated) samples on the reproduction (print)-color atlas was carried out. 26 This article is a continuation of the research conducted by Hajdek et al, in which a shift of the perceived lightness of the observer during the manifestation of the simultaneous contrast effect was shown.…”