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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 30 — Oct. 20, 2008
  • pp: 5644–5653

Linear basis for metallic and iridescent colors

José M. Medina  »View Author Affiliations

Applied Optics, Vol. 47, Issue 30, pp. 5644-5653 (2008)

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I have examined the correlation structure in goniochromism by principal-component analysis. Reflectance spectra were collected in synthetic samples that reproduce metallic, nacreous, and iridescent effects under different viewing angles. Although three principal components take into account 99% of the variance, between seven and eight are needed to reach 99.99%. The results were also confirmed by analyzing each viewing condition separately. It was found that although the viewing angle does not modify the first three basis functions, it affects the higher-order ones. These angle-dependent effects can be attributed to optical interference flakes. The implications for pigment identification are discussed.

© 2008 Optical Society of America

OCIS Codes
(120.5700) Instrumentation, measurement, and metrology : Reflection
(260.3160) Physical optics : Interference
(310.1620) Thin films : Interference coatings
(330.1730) Vision, color, and visual optics : Colorimetry
(310.3915) Thin films : Metallic, opaque, and absorbing coatings
(310.6188) Thin films : Spectral properties

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: July 8, 2008
Manuscript Accepted: September 17, 2008
Published: October 15, 2008

Virtual Issues
Vol. 3, Iss. 12 Virtual Journal for Biomedical Optics

José M. Medina, "Linear basis for metallic and iridescent colors," Appl. Opt. 47, 5644-5653 (2008)

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