Calibration of Gloss Measurements
Abstract:Print gloss and attributes such as differential gloss and gloss uniformity are closely related to the specular reflectance characteristics of printed images. An instrument has been developed for the quantitative measurement of the specular reflectance of printed images based on gonio-photometric and micro-densitometric techniques. The device, called a micro-goniophotometer, can be calibrated to known reference materials and produce quantitative analytical information on the specular reflectance of printed materials. The reflectance factors are resolved both angularly, to yield a BRDF, and spatially to provide a measure of gloss variation resolved to the micro-scale. As a result, the causes of gloss differences can be parsed into differences in (a) angular distribution of reflected light, (b) optical constants of the materials, and (c) sub-structural reflectance factors. Examples of the application of the instrument to the characterization of different types of gloss phenomena will be presented along with a description of the configuration and calibration of the instrument.
Document Type: Research Article
Publication date: 2007-01-01
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.
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