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.

Document Type: Research Article

Publication date: January 1, 2002

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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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