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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 9 — Sep. 4, 2009

Quantification of dichromatism: a characteristic of color in transparent materials

Samo Kreft and Marko Kreft  »View Author Affiliations


JOSA A, Vol. 26, Issue 7, pp. 1576-1581 (2009)
http://dx.doi.org/10.1364/JOSAA.26.001576


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Abstract

The color of a material, such as solution of a dye, can change by changing parameters like pH, temperature, illumination direction, and illumination type. Dichromatism—a color change due to the difference in thickness of the material—has long been known as a property of only a few materials. Here we show that dichromatism is a common property of many substances and materials, and we introduce a method for its quantification. We defined dichromaticity index (DI) as the difference in hue angle ( Δ h a b ) between the color of the sample at the dilution, where the chroma is maximal, and the color of four times more diluted (or thinner) and four times more concentrated (or thicker) sample. The two hue angle differences are called dichromaticity index toward lighter ( DI L ) and dichromaticity index toward darker ( DI D ) , respectively. High dichromaticity was found for materials that were previously known as dichromatic (pumpkin oil, bromophenol).

© 2009 Optical Society of America

OCIS Codes
(300.1030) Spectroscopy : Absorption
(330.1690) Vision, color, and visual optics : Color
(330.1710) Vision, color, and visual optics : Color, measurement
(330.5020) Vision, color, and visual optics : Perception psychology

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: January 15, 2009
Revised Manuscript: April 24, 2009
Manuscript Accepted: May 13, 2009
Published: June 11, 2009

Virtual Issues
Vol. 4, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Samo Kreft and Marko Kreft, "Quantification of dichromatism: a characteristic of color in transparent materials," J. Opt. Soc. Am. A 26, 1576-1581 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=josaa-26-7-1576

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