Photographic printing method
US4797713A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Aug 3, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03D15/003
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
When a number of prints of an image frame are made at a time or different times for the multiple printing, test printing, or re-printing thereof, it is needed to have them printed under the same condition and mode. However, it has been difficult to produce them without a deviation or variation of densities even when the same selected image frame is printed, because the photometric measurement of the image frame has been made conventionally before each time of printing for the operation and determination thereby of an exposure amount under which the printing is made, and because such photometric measurement at each time of printing gives an exposure amount which is slightly different at each time. In this invention, photometric data of a specific image frame which has been printed once are memorized, and when the specific image frame is to be printed once again, the frame is printed always at an entirely constant density on the basis of the data memorized and read-out at each succeeding printing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.