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Contour Mapping of Readability of Hardcopies on the Plane of Optical Density: Characters and Background -A Guideline for Designing Electronic Paper-

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Readability of hardcopies as determined by image density was evaluated for the purpose of clarifying the goal of readable Electronic Paper. Subjective evaluations were carried out on the readability of hardcopies whose characters and background has various combinations of optical densities. Evaluated results are summarized as a contour map of readability on the plane of optical density: characters and background. Two conventional ways of calculating contrast ratio (OD ratio and reflectance ratio) were evaluated using the mapped values. It is confirmed that equal contrast lines as determined by OD ratio show better agreement with the contour line of readability than those based on the reflectance ratio.

Document Type: Research Article

Publication date: January 1, 2004

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  • 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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