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An Evaluation Method of Gradation Reproduction Based on Micro Colorimetry

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As the image quality of color and monochrome electrophotographic printers has improved, they are beginning to be used for graphic users. Printer output images that contain gradations have been increasing, and smooth reproduction of gradation is one of the important subjects of image quality. This paper describes an evaluation method of gradation by using decomposition into Lightness and Chroma based on micro colorimetry with a flatbed scanner. In order to evaluate the reproducibility of gradation, difference value from a desirable gradation is computed, and a perceptual threshold value is determined that can be used as a basis for judgment of detecting difference value. The desirable gradation is derived from compensating for measured gradation by the transfer function of human visual perception. A high correlation between the total of difference value that is greater than a perceptual threshold value and psychological score of smoothness of gradation, is achieved.
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Document Type: Research Article

Publication date: 2002-01-01

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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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