Jiang, L, Wang, H, Gao, C et al. (4 more authors) (2022) Skin color measurements before and after two weeks of sun exposure. Vision Research, 192. 107976. p. 107976. ISSN 0042-6989
Abstract
We performed spectrophotometric measurements of skin reflectance at four body locations (forehead, cheek,neck, and back of hand), before and after two weeks of sun exposure, for 103 first-year college students. Skin reflectance was measured twice at each body location, before and after two weeks of sun exposure, obtaining an average repeatability (mean color difference from the mean) in the range of 0.2–0.5 CIELAB units (D65 illuminant, CIE 1931 standard observer). However, the average skin color differences before and after two weeks of sun exposure were in the range of 3.6–3.9 CIELAB units, considerably higher than measured repeatability, as a consequence of suntanning. Skin color appearance variation was analyzed in the CIELAB color space, and it was found that at all body locations two weeks of sun exposure made lightness L* and hue-angle hab significantly decrease, a* and chroma C*ab significantly increase, and b* shows no statistically significant changes (except for hab at the forehead and cheek, and for a* at the forehead where no statistically significant changes were found). An W shape for skin spectral reflectance between 520 nm and 600 nm was found at some of the four measured body locations. It was found that the individual typological angle (ITA) defined from L* and b* performed well in predicting our measured data and a modification of ITA using L* and C*ab performed even better, with the measured L* as reference. The color shifts produced by two weeks of sun exposure in different planes of CIELAB were analyzed for the skin categories established by the ITA index, and compared with the control group data accumulated by Amano et al. (PLoS ONE. 15(12), e0233816)(PLoS ONE 15(2020) e0233816). The measured skin spectra can be useful to the skin color database currently being developed by CIE TC 1-92.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 Elsevier Ltd. All rights reserved. This is an author produced version of an article, published in Vision Research. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Skin reflectance; Individual typological angle (ITA); CIELAB color space |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Arts, Humanities and Cultures (Leeds) > School of Design (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 10 Jun 2022 11:18 |
Last Modified: | 07 Dec 2022 01:13 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.visres.2021.107976 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:187764 |
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