Devices and methods for offset and similar printing systems

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358534, 358536, H04N 140

Patent

active

057935009

ABSTRACT:
A method for producing a half-tone image faithfully representing a continuous-tone original includes a step of forming in the image a pattern of substantially continuous, substantially parallel lines at a frequency of between about 100 and 400 lines per inch, such that the width of the lines at a given point in the image varies in relation to the optical density of at least one color component at a corresponding point in the continuous-tone original. The method may be used for color separations with each separation produced by scanning at a different angle. The method may be implemented using photomechanical or electronic scanning techniques.

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Goren, R.N., "High Quality Pictorial Xerographic Reproduction By Halftone Screening", Electrophoyography 4th International Conference, Washington, D.C. (1981) pp. 299-317.
"Filme und Platten Rasterphotographie", found in Moderne Chemigraphie in Theorie und Praxis, Polygraph Verlag GmbH, Frankfurt 1957, pp. 91-100.
Ulichney, R., "Digital Halftoning", The MIT Press, Cambridge, Mass. (1988), preface, p. 2 and Chap. 5.
"Publish", Jun. 1991, p. 76.

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