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Multilevel Color Halftoning

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A new high-speed color printer uses new image screening methods that lead to superior-quality images. The screen rulings as well as the screening angles are varied. The cyan, magenta, and yellow screens are around 200 lines per inch. The black screen starts at 212 lines per inch at 45 degrees and progresses to 300 lines per inch at zero degrees when half the pels in the basic cell are on. This improves the details in the black color plane without introducing significant moiré patterns.

Since the printer is capable of 4 bits/color, threshold matrices are used to determine onset of printing. The actual output intensities are selected from look-up-tables indexed by the input value minus the threshold. Experiments showed that the intermediate intensity values reproduced best as leading pels on vertical marks. Results for mixing halftones at significantly different screen rulings are illustrated.
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Document Type: Research Article

Publication date: 01 January 2001

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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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