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Characterization of Chromatic Banding Artifact for Secondary Colors in a Polychrome Electrophotographic Process

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Several passive and active banding compensation strategies have been proposed in recent literatures for monochrome EP processes. In these studies, quasi-periodic contrast variations can be effectively reduced. For polychrome EP process, in which multiple color layers are superimposed on top of one another, Klassen and Goodman have shown the dependence of contrast sensitivity on variation in chromatic channels such as a* and b*. Chromatic bandings are quasi-periodic gratings with variation in chromatic channels. Chromatic banding may still be perceivable when the achromatic banding on individual color layers has been reduced to under the threshold. The perceptibility of chromatic banding is dependent on the primary colors of the platform. Before a softcopy psychophysics experiment was conducted, a set of tone curves and a model of the mixing of two primary colors, excluding the black, were constructed according to a 4-color EP printer. The psychophysics study confirmed that even if the sinusoidal gratings (in L*) on each individual primary color layer is under the human visual system (HVS) threshold, superimposing one on top of another can increase the perceptibility of the composite gratings. These results will be much valuable to ongoing efforts to reduce chromatic banding.

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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