System and method of selecting the reproducible colors in a discrete reproduction system
US5287122A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1990 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Aug 23, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of reproduction in a discrete reproduction system where the available colors are arranged in equally perceptible steps. Because in a discrete reproduction system only a limited set of points can be produced from the gamut of colors, the present method selects the color variables describing the set of points such that the difference between colors is equiperceptible. Preferably, a numerical approximation to the Munsell book of color is used to determine the hue, saturation, and luminance of the colors used in the reproduction system. The preferred embodiment is a gray scale printer where the preceived contrast between levels of gray is uniform--i.e. equiperceptible. To achieve equiperceptible gray scale requires that the increments in print density be nonuniform. To determine the desired print density to achieve an equiperceptible gray scale, the print density is determined using a numerical approximation of the Munsell value coordinates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.