Method and device for selecting the appropriate contrast grade photographic for printing a black and white transparency
US4885607A · kind A · utility
2Cited by
2References
5Claims
0Family size
Inventor
Key dates
| Filing date | Sep 14, 1988 |
| Grant date | Dec 5, 1989 |
| Priority date | — |
| Expiry date | Sep 14, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/72
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A device and method for selecting a contrast grade of paper or variable-contrast filter for printing a black and white negative utilizing a clear substrate having a plurality of sections, each section having a different color equivalent to a different variable contrast filter and each section having approximately the same density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.