Devices and methods for offset and similar printing systems
US5793500A · kind A · utility
Inventors
Key dates
| Filing date | Jan 21, 1994 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Jan 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.