Integrated photoscreen for making a halftone reproduction printing plate from a photograph
OwnerEdmund S. Zinkinventor
Life of this patent
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Abstract
The photoscreen for making a halftone reproduction from a photograph is used in a process where the photograph is placed in a reproducing position relative to a reproducing apparatus and the screen is interposed between the photograph and the reproducing means of the reproducing apparatus so that upon operation of the reproducing apparatus, a halftone reproduction is created. The photoscreen comprises a sheet of transparent material having on the bottom surface thereof an array of light modulating, varying density, light gray, vignetting dots mixed with an array of light modulating white dots preferably printed on the top surface thereof.
Claims40
A method for making a halftone reproduction from a document, such as a photograph, having continuous tone areas, comprising the steps of:
- placing a document in a reproducing position relative to a reproducing apparatus;
- interposing between the document and reproducing means of the reproducing apparatus a transparent photoscreen comprising a sheet of transparent substrate material having an array of varying density, light modulating, light gray, vignetting dots which vary in density from a lightest density outer area to a darkest core density in the extreme center of the dot formed on one side of the sheet mixed with an array of light modulating white dots formed on the other side of the sheet and operating the reproducing apparatus to create a halftone reproduction of the document or photograph with said photoscreen serving to reduce the original document's continous tone density range.
A photoscreen for making a halftone reproduction from a document, such as a photograph, having continuous tone areas, in a process where a photograph is placed in a reproducing position relative to a reproducing apparatus and said photoscreen is interposed between the document and reproducing means of the reproducing apparatus so that upon operation of the reproducing apparatus, a halftone reproduction of the document is created, said photoscreen comprising a sheet of transparent substrate material having an array of light modulating, varying density, light gray, vignetting dots formed on one side thereof, which vary in density from a lightest density outer area on the outside perimeter of the dot to a darkest core density in the extreme center of the dot, mixed with an array of light modulating white dots formed on the other side of said sheet of substrate material.
Dependencies are inferred from the claim text.