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Presented is a unique halftone geometric configuration for color halftone printing with an arbitrary number of colorants. The configuration uses a plurality of halftone screens to produce prints that are moire free and possess uniform hexagonal periodic ro- settes. Moire-free N-color halftoning is achieved by selecting half- tone frequencies from harmonics of two rosette fundamental fre- quencies. With such screen configurations, the interference between any halftone frequency components, fundamentals, or higher-order harmonics of different colorants is a linear integer com- bination of the two rosette fundamental frequencies. The linear inte- ger combination produces a hexagonal grid of frequency compo- nents with no components lower than the rosette frequencies other than the zero-frequency component. Thus, no visible interference, or moire, occurs within the halftone screen combinations. The ob- served halftone pattern is a visually pleasing, two-dimensionally uni- formly repeated hexagonal rosette. The uniform-rosette configura- tions can be implemented using digital single-cell nonorthogonal halftone screens. The uniform-rosette method can be used with con- ventional cyan-magenta-yellow-black halftone printing or with print- ing systems that require a relatively large number of halftone screens. The additional screens can be used for enhanced printing applications, such as printing with high-fidelity colorants, light colo- rants, or special colorants, such as white, metallic, and fluorescent. © 2008 SPIE and IS&T. DOI: 10.1117/1.2907206

journal of electronic imaging

Uniform-rosette color halftoning for &lt;inline-formula&gt;&lt;math display="inline" overflow="scroll"&gt;&lt;mrow&gt;&lt;mi&gt;N&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/inline-formula&gt;-color moiré-free printing