System for producing a color hardcopy having the color and the tone reproduction characteristics of a photograph
US5521723A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1994 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | Jun 16, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6011
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color image reproduction system of the type having a color monitor, an image processing computer, and a color printer is capable of making a color print that appears as if the original image was captured by a photographic process. The effect is achieved by providing a transform embodied in a three dimensional look-up table formed by composing: a) a transform for transforming the color digital image to original scene exposures; b) a transform for transforming the video scene exposures to photographic scene exposures; c) a transform for transforming photographic scene exposures to channel-independent densities; d) a transform for transforming channel-independent densities to reproduced densities; and e) a transform for transforming the reproduced densities to control signals for driving the color hard copy output means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.