Periodic, clustered-dot color screen design and stegatone performance characterization

Yung-Yao Chen, Purdue University

Abstract

Periodic clustered-dot screens are widely used for electrophotographic printers due to their print stability. Typically there are four-colorant color printing: cyan (C), magenta (M), yellow (Y), and black (K). Moreover, with the occurence of high fidelity color printing, one or more additional primary colorants, such as orange and violet, are needed to extend the gamut of printer. Nevertheless, when applied to color printing, superpositions of periodic screens may cause objectionable moire patterns. It is much harder to be solved while more and more colorant planes are superposed. Meanwhile, halftone designers also need to consider “print symmetry” (visual equality). In other words, in each colorant plane, we want the clustered dots as round as possible, in order to render more details equally in different directions, and for entire color screen set, we want the screen frequency of each colorant as close as possible. In this dissertation, we proposed a new color screen set which solves the moire problem and also gives the consideration to print symmetry issue.

Degree

Ph.D.

Advisors

Allebach, Purdue University.

Subject Area

Electrical engineering

COinS