Photomechanical apparatus
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United States of America Patent
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May 23, 1989
Grant Date -
N/A
app pub date -
Mar 11, 1988
filing date -
Mar 11, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed herein is a photomechanical apparatus suitable for use in the production of a printing plate, which is adapted to print a halftone picture corresponding to an original continuous-tone picture, on the basis of pictorial information signals obtained by photoelectrically scanning the original continuous-tone picture. The photomechanical apparatus is equipped with a tonal conversion system for converting the pictorial information signals in such a way that the base density of a desired control point on the original continuous-tone picture and the halftone intensity of a corresponding control point on the picture to be reproduced are correlated in accordance with a specific conversion formula.
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