Photomechanical apparatus
US4833546A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1988 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Mar 11, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4072
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.