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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.

Document Type: Research Article

Publication date: 2004-01-01

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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