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. 2018 Mar 16;9(2):2041669518761731. doi: 10.1177/2041669518761731

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© The Author(s) 2018

Creative Commons CC-BY: This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Schematic diagram of color shift simulation in CIE LAB_D65 space. (a) Illuminant chromaticity locus does not coincide with lightness axis of CIE LAB space, normalized to D₆₅ (CIE LAB_D65). Approximate achromatic locus is derived with $L_{base}^{*}$ . (b) Shaded ellipses represent gamut of an object in an image. Step 1: estimation of achromatic point locus, Step 2: alignment of achromatic point locus to lightness axis, and Step 3: adjustment of lightness differences. See text for details.