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The Impact of Halftone Screen on Color Graininess

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Color graininess is one of the most important artifacts affecting image quality. Previous studies have indicated that it is necessary to remove the screen signal on the scanned amplitude-modulated, AM, screen before adopting any granularity metric to achieve satisfactory correlation between the objective measurement and subjective evaluation, indicating the AMhalftone screen has no effect on the perceived graininess. Nonetheless, the inherent characteristics of FMhalftone screens with pseudorandom dot placement transforms the frequency content of the screen signal from spikes to a distribution across the spatial frequency domain. The objective of this experiment is to conduct a visual experiment comparing the perceived graininess on patches with various color generated by various types of AM and FM screens. Correlated with an unified objective granularity metric, we can evaluate the impact of various halftone screens on color graininess, and verify the assertion that the periodic screen signal is independent from the perceived graininess.

Document Type: Research Article

Publication date: January 1, 2006

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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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