Photomechanical apparatus

Details Photomechanical apparatus Photomechanical apparatus

1988-03-11

1989-05-23

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358293, H04N 121

Patent

active

048335460

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.

REFERENCES:
patent: 4668996 (1987-05-01), Hatayama
patent: 4680642 (1987-07-01), Shimamo et al.
patent: 4760460 (1988-07-01), Shimotohno
patent: 4768101 (1988-08-01), Webb

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