29 January 2007 Uniform rosette for moire-free color halftoning
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Abstract
By selecting halftone frequencies from high-order harmonics of two common rosette fundamentals for all color separations, a true moiré-free color halftoning can be achieved. With such screen configurations, the interference between any two frequency components, fundamentals or high-order harmonics, of different colors will also result in a linear combination of the two rosette fundamentals. Thereby, no visible interference, or moiré, at all will be shown in the output. The halftone outputs are two-dimensionally repeated patterns, as visually pleasant uniform rosettes. The uniform-rosette configurations can be implemented by single-cell non-orthogonal halftone screens for digital halftoning. Unlike "dot-on-dot" screening, or using one screen for all colors, uniform-rosette halftoning is robust to mis-registration between color separations. Several designs of uniform-rosette halftone screens have been successfully applied to Xerox iGen3 color printers for high-quality color reproduction.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shen-Ge Wang "Uniform rosette for moire-free color halftoning", Proc. SPIE 6493, Color Imaging XII: Processing, Hardcopy, and Applications, 64931E (29 January 2007); doi: 10.1117/12.705228; https://doi.org/10.1117/12.705228
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