As part of a project to develop improved analytical techniques for the characterization of print gloss, a study has been carried out on the chromatic effects on specular reflections. Fresnel's reflection law suggests one kind of chromatic effect. An increase in index of refraction occurs in a material as the wavelength of light approaches the wavelength of absorption, and the increased index results in an increased Fresnel reflection. However, analysis of C, M, and Y electrophotographic images did not reveal any evidence of this effect. Another very strong effect was found to be the contribution of Fresnel type reflections from sub-layers of the image to the first surface reflection. These sub layer effects were observed to contribute significantly to the total specular reflectance, provided the colorant layer had a minimum absorptance. For example, for measurements of C, M, and Y toner fused on paper, measured in R, G, and B light, the minimum amount of specular reflection was measured for Cyan in Red, Magenta in Green, and Yellow in Blue. Quantitative modeling of this multiple specular reflec-tion has been consistent with experimental measurements.

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This article may be accessed on the publisher's website (additional fees may apply) at: http://www.imaging.org/store/epub.cfm?abstrid=31981ISBN:0-89208-253-4Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

Document Type


Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)


RIT – Main Campus