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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 16 — Jul. 30, 2012
  • pp: 17560–17565

Low-frequency correlations (1/f α type) in paint application of metallic colors

José M. Medina and José A. Díaz  »View Author Affiliations

Optics Express, Vol. 20, Issue 16, pp. 17560-17565 (2012)

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We examine trial-to-trial variability of color coordinates in automotive coatings containing effect pigments, which are considered a reference paradigm for engineering angle-dependent color effects. We report the existence of correlations that show 1/f - Fourier spectra at low frequencies in all color coordinates. The scaling exponent was lower at near-specular conditions for lightness variations, suggesting a contribution from the deposition of metal flakes in metallic colors. However, the exponent was lower near the specular for blue-yellow variations, suggesting a contribution from chemical pigments in solid colors. These results were independent of the illuminant spectra. The methods employed are useful in the evaluation of industrial color matching among assembly parts.

© 2012 OSA

OCIS Codes
(000.5490) General : Probability theory, stochastic processes, and statistics
(310.1620) Thin films : Interference coatings
(310.1860) Thin films : Deposition and fabrication
(330.1730) Vision, color, and visual optics : Colorimetry
(290.1483) Scattering : BSDF, BRDF, and BTDF
(310.3915) Thin films : Metallic, opaque, and absorbing coatings

ToC Category:
Thin Films

Original Manuscript: May 15, 2012
Revised Manuscript: June 24, 2012
Manuscript Accepted: June 25, 2012
Published: July 18, 2012

Virtual Issues
Vol. 7, Iss. 9 Virtual Journal for Biomedical Optics

José M. Medina and José A. Díaz, "Low-frequency correlations (1/fα type) in paint application of metallic colors," Opt. Express 20, 17560-17565 (2012)

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