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. 2018 Sep 12;18(9):3051. doi: 10.3390/s18093051

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Colors 3L2.5 and 3R2.5 of the 3D shade tab measured by the developed digital shade-matching device in the CIEL*a*b* color space: (a) two-dimensional hyperplane; (b) Euclidean distance in the three-dimensional color space; (c–e) Euclidean distance in the two-dimensional color space of the a*b*, L*a*, and L*b* axis. (Small red and blue circles: mean colors of 3L2.5 and 3R2.5 in the database; large red and blue circles: averaged color of the mean color group in the database; red square: mean color of 3L2.5 measured additionally for testing).

Colors 3L2.5 and 3R2.5 of the 3D shade tab measured by the developed digital shade-matching device in the CIEL*a*b* color space: (a) two-dimensional hyperplane; (b) Euclidean distance in the three-dimensional color space; (c–e) Euclidean distance in the two-dimensional color space of the a*b*, L*a*, and L*b* axis. (Small red and blue circles: mean colors of 3L2.5 and 3R2.5 in the database; large red and blue circles: averaged color of the mean color group in the database; red square: mean color of 3L2.5 measured additionally for testing).