Process for the production of negative continuous-tone images
US3977872A · kind A · utility
9Cited by
10References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1975 |
| Grant date | Aug 31, 1976 |
| Priority date | — |
| Expiry date | Jul 7, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Negative continuous-tone images or continuous-tone separation records having standardized contrast are produced from originals which are differing in contrast by means of a photograhic material the silver halide emulsion of which has a characteristic curve with a sagging course defined below, whereby the part of characteristic curve which is utilized for the production of the continuous-tone negative depends on the contrast of the original.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.