Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1995-06-07
1999-06-01
Ro, Bentsu
Facsimile and static presentation processing
Natural color facsimile
Color correction
359444, 359448, 359457, H04N 121, H04N 146
Patent
active
059092912
ABSTRACT:
A color matching system initializes a translator by storing profiles of source and destination color devices which include the coordinates in a calibrated color space of the colorants produced in the source and destination devices and a tonal reproduction curve for each device. Mixing equations and parameters are precomputed to be used in matching calculations of an image including color pixels to be matched. The color gamut is divided into mixing regions in which a given point can be produced by a mixture of two chromatic colorants and the achromatic colorants of the destination device. A technique for selecting a mixing region is included which is based on the slopes of vectors defining the colorants of the destination device, and the sample color to be produced. Colors that are out of the gamut of the destination device are adjusted according to precomputed parameters in order to preserve the lightness, chromaticity, or other selected characteristics of the sample color as suits the need of a particular application. The system is particularly suited for computer systems independent of the source and destination devices to be used, and can be adapted to run with a translation cache to enhance the speed of operation of translating a color image on one device for display on a second device.
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Johnson Robert
McGreggor Keith
Myers Robin D.
Othmer Konstantin
Apple Computer Inc.
Ro Bentsu
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