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Nonorthogonal Halftone Screens

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In color reproduction, the most troublesome moiré pattern is the second-order moiré, or the three-color moiré, usually produced by mixing of cyan, magenta and black halftone outputs. A classical 3-color zero-moiré solution is using three identical cluster halftone screens with different rotations: 15°, 45° and 75°, respectively. However, for most digital printing devices, the size and shape of halftone screens are constrained by the “digital grid”, which defines the locations of printed dots, and therefore, an exact 15° or 75° rotation of a cluster screen is impossible. Although there are many alternative approaches for moiré-free color halftoning, most of them only provide approximate solutions and/or have a tendency to generate additional artifacts associated with halftone outputs. The difficulty to achieve moiré-free color halftoning is greatly relieved by using nonorthogonal halftone screens, i.e., screens in general parallelogram shapes. As a matter of fact, there exist many practical solutions by combining three simple nonorthogonal halftone screens. In this paper, a general condition for 3-color zero-moiré solutions is derived. A procedure using integer equations to search practical solutions for different applications is also described.

Document Type: Research Article

Publication date: 2002-01-01

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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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