Study on Just-Noticeable Color Difference Discrimination Threshold by Using Printed Samples I: Analysis of Visual Evaluation Experimental Data

Min, 黄敏 Huang; Haoxue, 刘浩学 Liu; Ningfang, 廖宁放 Liao

doi:10.3788/aos20092905.1431

Cited by 9 publications

(4 citation statements)

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“…This discoloration is almost indistinguishable by human eye, since it's lower than 2.3 which is the just noticeable difference in color. 9 , 10 , 11 The 120‐min ΔE of the liquid foundation with the largest discoloration was almost 8, which obviously exceeded 2.3, indicating that the severity of discoloration among products differs greatly. It can also be seen from Figure 6 that even products with a similar discoloration at 120 min showed a significant difference in the discoloration rate.…”

Section: Resultsmentioning

confidence: 97%

Research on the intrinsic mechanism of the darkening of liquid foundation

Chen¹,

Tan

Wang³

et al. 2022

Skin Research and Technology

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Background To investigate the intrinsic mechanism that causes the darkening of liquid foundations. Materials and method A total of 36 commercial liquid foundations were firstly studied for preliminary screening of influencing factors. A basic liquid foundation was developed for controlling variables to study the influence of each single factor. These samples were evenly spread on the standard opacity charts with the thickness of 100 μm and applied onto human inner forearm skin with the dosage of 2 mg/cm2. The discoloration of each sample was continuously recorded using spectrophotometers and reported in the CIE 1976 L*a*b* color space for at least 120 min, and ΔE was calculated to describe the severity of darkening. Results One hundred twenty‐minute ΔE of all commercial foundations was highly negatively correlated with their 120‐min ΔITA° (R2 = 0.88, p < 0.01). A strong positive correlation was found between the severity of darkening and the volatilization of the basic foundations (R2 = 0.83, p < 0.01). And the darkening of silicone‐based basic foundations using pigment coating with silicon is weaker than those without silicon (p < 0.05). Conclusion The process of the discoloration of liquid foundation is accompanied by the decrease of ITA° and manifested as darkening. The volatilization rate of the product and the coating method of the pigments used in the formula can noticeably affect the darkening of the liquid foundation.

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Section: Resultsmentioning

confidence: 97%

Research on the intrinsic mechanism of the darkening of liquid foundation

Chen¹,

Tan

Wang³

et al. 2022

Skin Research and Technology

View full text Add to dashboard Cite

show abstract

“…The ellipses are chromaticity ellipses. It is reasonable to present color identification thresholds with chromaticity ellipses [9].…”

Section: Thresholds Of Color Identification and Chromaticity Ellipsesmentioning

confidence: 99%

Analysis on Color-Distinguishing Threshold of Printed Samples and Chromatic Characteristics of Human Eyes

Dong

2012

AMM

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In order to study the visual characteristics of the human eye on color-distinguishing threshold levels, an experiment, of which the results provide significant data reference and theoretical basis for improvement of color evaluation methods of printing products, was carried out with 20 observers whose visual characteristics are normal. The observers were provided 5 basic colors that the CIE recommended for color evaluation study, and the constant stimulation psychophysical method was used in the visual experiment. The color patches were printed out with small color threshold variations. The color-distinguishing thresholds and visual characteristics were obtained through the experiment. Results showed that the notable color threshold values of green and red patches were relative larger, indicating larger visual tolerances. It is also shown that the red region in CIELAB color space has the best uniformity to human eyes among the five colors.

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“…In former research, the small color-difference data sets [3] have been obtained by putting up visual evaluation of small color-difference printed samples according to the seventeen color centers recommend by CIE, then the classical colordifference formulae CIE L*a*b*, CIEDE94, CMC (1:1), CMC (2:1) and CIEDE2000 based on CIE L*a*b* have been used to calculate color difference of the printed samples. The consistency between the color-difference value obtained by CIEDE2000 color-difference formula and visual evaluation was the best, while the performance of CIE L*a*b*, CMC and CIE94 color-difference formulae have inconspicuous difference [4].…”

Section: Analysis Of Color-difference Formulaementioning

confidence: 99%