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A new method for the evaluation of makeup coverage using hyperspectral imaging.

Carl Blaksley1, Kumiko Udodaira1, Alexandre Nicolas1

  • 1L'Oréal Research & Innovation, Kawasaki, Kanagawa, Japan.

Frontiers in Chemistry
|September 26, 2024
PubMed
Summary

Hyperspectral imaging introduces new parameters to objectively measure makeup foundation coverage. A homogeneity factor correlates with sensory coverage, while a spectral shift factor relates to color change, aiding product categorization.

Keywords:
color evaluationhyperspectral imagingproduct evaluationspectral analysisspectral imaging

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Area of Science:

  • Cosmetic science
  • Optical engineering
  • Image analysis

Background:

  • Makeup foundation coverage is a complex, perceived attribute not fully captured by traditional optical properties.
  • Existing instrumental measurements lack consistency for comparing product coverage.
  • Hyperspectral imaging offers new parameters for objective analysis of cosmetic attributes.

Purpose of the Study:

  • To explore new parameters and analysis methods using hyperspectral imaging for quantifying makeup foundation coverage.
  • To define and validate a homogeneity factor and a spectral shift factor for assessing coverage.
  • To correlate instrumental measurements with sensory perceptions of coverage.

Main Methods:

  • Development of a homogeneity factor measuring spectral angle distribution changes.
  • Definition of a spectral shift factor indicating spectral change post-application.
  • Application of these parameters to a hyperspectral imaging dataset of three foundation products on nine models.

Main Results:

  • The homogeneity factor correlates with sensory rankings of foundation coverage.
  • The spectral shift factor correlates with the visible color change induced by the foundation.
  • Distinct product categories were identified based on the combined effects of the homogeneity and spectral shift factors.

Conclusions:

  • The homogeneity factor provides a measurable correlate for perceived foundation coverage.
  • While promising, the homogeneity factor alone does not fully encompass coverage.
  • Future research must consider factors like skin tone and product shade variability for a comprehensive understanding of coverage.