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Color characterization of coatings with diffraction pigments
Summary
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.
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.
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