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Color characterization of coatings with diffraction pigments.

A Ferrero, B Bernad, J Campos

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |November 10, 2016
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    Summary
    This summary is machine-generated.

    This study characterizes the iridescence of diffraction pigment coatings using spectral bidirectional reflectance distribution functions (BRDFs). A new geometric factor helps analyze spectral reflectance and color gamut variations in these complex goniochromatic coatings.

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    Area of Science:

    • Materials Science
    • Optics
    • Color Science

    Background:

    • Coatings with diffraction pigments exhibit high iridescence, necessitating accurate characterization for appearance description.
    • Understanding the spectral bidirectional reflectance distribution functions (BRDFs) is crucial for quantifying iridescence.

    Purpose of the Study:

    • To measure and analyze the spectral BRDFs of coatings containing SpectraFlair diffraction pigments.
    • To propose a geometric factor for characterizing spectral reflectance and color gamut variations in these coatings.
    • To provide recommendations for improving commercial goniospectrophotometers for analyzing goniochromatic coatings.

    Main Methods:

    • Measurement of spectral BRDFs for six different coatings with SpectraFlair diffraction pigments using a robot-arm-based goniospectrophotometer (GEFE).
    • Application of Principal Component Analysis (PCA) to the acquired BRDF data.
    • Evaluation of data and theoretical considerations to propose a relevant geometric factor.

    Main Results:

    • A relevant geometric factor was identified that simplifies the analysis of spectral reflectance and color gamut.
    • At fixed values of this geometric factor, the spectral BRDF component attributed to diffraction remains nearly constant.
    • The study found that existing portable goniospectrophotometers need more aspecular measurement angles, but not additional irradiation angles or out-of-plane geometries, for effective characterization.

    Conclusions:

    • The proposed geometric factor offers a valuable tool for studying the spectral properties and color variations of diffraction pigment coatings.
    • The findings suggest practical improvements for commercial instruments to better characterize complex goniochromatic effects.
    • Accurate characterization of these coatings is essential for applications in industries like automotive.