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A Simplified Overprint Model and Why the Masking Equations “Sort Of” Work for Color Halftone Hardcopy

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The linear masking equations, inspired by continuous tone photographic color, were applied by Murray, et al., to halftone printing. This model is considerably simpler than models customarily used for halftone color hardcopy, such as those based on Neugebauer. Despite unrealistic assumptions regarding the image microstructure, the masking equations often perform reasonably well.

In this paper, the differences between the linear masking model and the model of Yule and Colt (Neugebauer with wideband Yule-Nielsen correction applied) are parsed. It is shown that, under conditions for which the Yule-Nielsen parameter n grows without bound (or its reciprocal, u, approaches zero), the differences can be attributed to sub-additivity of densities. An approximation is offered to model the sub-additivities.

The largest difference between the two models can be expected to occur under normal circumstances when all colorants are printed solid.
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Document Type: Research Article

Publication date: January 1, 2013

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, a vibrant interactive (poster) papers session, and workshops. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper; there are also Best Paper and Best Student Paper awards.

    Please note: for Purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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