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Color Properties of Specular Reflections

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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 sublayers 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 reflection has been consistent with experimental measurements.
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Document Type: Research Article

Publication date: 2004-01-01

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  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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