Patent
Rosette printing with up to five colors
Shen-ge Wang,Robert P. Loce +1 more
TLDR
In this article, a method and apparatus for moire-free color halftone printing with up to five color image separations is presented, which utilizes a plurality of non-orthogonal halFTone screens to produce outputs that are moire free and form rosettes.Abstract:
Disclosed herein is a method and apparatus for moire-free color halftone printing with up to five color image separations. The method and apparatus utilize a plurality of non-orthogonal halftone screens to produce outputs that are moire free and form rosettes. The method and apparatus provide for defining a first and a second color halftone screen fundamental frequency vector for each of three halftone screens such that the halftone screen set output forms moire-free rosettes; then defining a fourth color halftone screen where a first fundamental vector of the fourth screen shares a fundamental frequency vector with one of said three halftone screens and a second fundamental frequency vector of the fourth screen shares a fundamental frequency vector with a different one of said three color halftone screens; and further defining a fifth color halftone screen where a first fundamental vector of the fifth screen shares a fundamental frequency vector with one of said three halftone screens and a second fundamental frequency vector of the fifth screen shares a fundamental frequency vector with a different one of said three color halftone screens, and the neither of the fundamental frequency vectors of the fifth screen are equal to either of the fundamental frequency vectors of the fourth screen.read more
Citations
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Journal ArticleDOI
The Lattice-Based Screen Set: A Square $N$ -Color All-Orders Moiré-Free Screen Set
TL;DR: A principled approach for the moiré-free screen design that is called lattice-based screen design, which offers more flexibility in designing N -color screen sets with different halftone geometries, and all of them are guaranteed to be all-orders moire-free.
Patent
Expanded color gamut
TL;DR: In this article, a method of extending the gamut of standard 4-color process printing is presented, which yields various novel process printing ink sets according to which an extended color gamut can be provided without requiring the addition of a sixth or seventh primary ink to the existing four-color ink set.
Patent
System and Method of Halftone Printing of Image Spot Colors Using Ranked Ordered Pairing of Colorants and Halftone Screens
Edul N. Dalal,Robert P. Loce +1 more
TL;DR: In this paper, a quality ranking of a plurality of periodic halftone screens to be used in halftoning the image and an objectionability ranking of the colorants used to produce the one or more image spot colors are provided.
Patent
Lattice-based screen design for n-color all-orders moire-free screen set
TL;DR: In this paper, a method and system to generate a moire-free all-orders N-color screen-set by a lattice-based screen design is presented. But the method is not suitable for all-order applications.
Patent
Moiré-free color halftoning methods, apparatus and systems
Shen-ge Wang,Robert P. Loce +1 more
TL;DR: In this paper, a moire-free color halftoning method, apparatus and systems to digitally reproduce an original color image are described, which are particularly useful for rendering a color image with a color printing device.
References
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Patent
System for printing color images with extra colorants in addition to primary colorants
TL;DR: In this paper, a "hi-fi" color printing system, wherein colorants of hi-fi colors beyond the regular CMYK primary colorants are available, a main gamut obtainable with the CMY-K colorants only is mutually exclusive with at least one extended gamut in which a Hi-fi colorant is used and a complementary one of the traditional colorants is excluded.
Patent
Non-perpendicular, equal frequency non-conventional screen patterns for electronic halftone generation
TL;DR: In this paper, the threshold equation is used to calculate a threshold gray value that is compared to the desired local image value to determine whether a particular point should be "on" or "off".
Patent
Screening system and method for color reproduction in offset printing
TL;DR: In this article, a screening system and a method for reproduction of images in printing is described, which is Moire free by the fact that deviations in angles from the conventional system are exactly offset by the deviations in line rulings.
Patent
Image forming apparatus and method
TL;DR: In this paper, the color development of a normally printed image without foamed toner and that of a three-dimensional printed image with foamed tones coincide with each other, and the problem of obtaining good printing quality is solved by using a color conversion coefficient table.