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. 2019 Dec 18;12:919–929. doi: 10.2147/CCID.S217956

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© 2019 Mac-Mary et al.

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Colour analysis of the zones by image processing of VISIA photographs; (A) L*Lightness. (B) DeltaE, Colour difference between each of the infraorbital zones and the cheek. (C) a*red-green component. (D) b*yellow-blue component. (N =12 with dark circles versus N=12 without dark circles, *p<0.05, **p<0.01).

Abbreviations: Z1, Zone 1; Z2, Zone 2; Z3, Zone 3; ZC, Cheek Control Zone.