A reduced set of measurement geometries allows the spectral reflectance of special effect coatings to be predicted for any other geometry. A physical model based on flake-related parameters has been used to determine nonredundant measurement geometries for the complete description of the spectral bidirectional reflectance distribution function (BRDF). The analysis of experimental spectral BRDF was carried out by means of principal component analysis. From this analysis, a set of nine measurement geometries was proposed to characterize special effect coatings. It was shown that, for two different special effect coatings, these geometries provide a good prediction of their complete color shift.
© 2013 Optical Society of America
Original Manuscript: September 14, 2012
Revised Manuscript: December 5, 2012
Manuscript Accepted: December 21, 2012
Published: January 11, 2013
Vol. 8, Iss. 3 Virtual Journal for Biomedical Optics
Alejandro Ferrero, Ana Rabal, Joaquín Campos, Francisco Martínez-Verdú, Elísabet Chorro, Esther Perales, Alicia Pons, and María Luisa Hernanz, "Spectral BRDF-based determination of proper measurement geometries to characterize color shift of special effect coatings," J. Opt. Soc. Am. A 30, 206-214 (2013)