Measurement of skin color: practical application and theoretical considerations.

TLDR

Quantifying erythema and pigmentation is essential for assessing skin responses to stimuli and therapy efficacy, and recent portable optoelectronic devices enable such measurements, though color data must be interpreted cautiously due to perceptual and optical property considerations. This article reviews methods for measuring skin color and related parameters. It discusses each method’s characteristics through a theoretical optical skin model.

Abstract

Quantification of erythema and/or pigmentation is important for in vivo assessment of skin reactions to external stimuli such as ultraviolet radiation. Measurement of lesional color is also useful for quantitative evaluation of the efficacy of therapies for skin lesions. Several types of portable optoelectronic instruments have recently become available for these purposes and have been applied to research in dermatology, physiology, pharmacology, and cosmetic science. As color is not a genuine physical quantity but a sensory perception based on color vision, any colorimetric data obtained for the skin should be interpreted carefully. Erythema and melanin indices derived from skin reflectance data should also be evaluated in relation to the optical properties of the skin to avoid misuse. In this article, various methods for quantifying skin color and related parameters are reviewed and the characteristics of each method are discussed theoretically using an optical model of the skin.