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.
