Color editing with simple encoded images
US5204665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1991 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Dec 9, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an original image in red, green, blue color space (RGB) defined by a large number of colors, color variety of the original image is accomplished by displaying a reduced representative color set. The reduced representative color set is produced by initially treating each color separation individually, to reduce the number of levels defining the image, in a manner which retains much of the image information. Subsequently, the separations are combined into an index into color set in a look up table (LUT) having between about 27 and 120 RGB triplets. Each RGB triplet defined by one of the LUT triplets is converted to a luminance/chrominance value. Modifications are made to the image in luminance/chrominance, and converted back to RGB space to reload the LUT for real time color variation of the image. Upon establishing a desirable color set in luminance/chrominance space, the luminance/chrominance values selected, which define the new position of the image in luminance/chrominance space, are used to change the colors in the original in a single step. The new original image is then again displayed with a new reduced representative color set derived in the same manner as described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.