Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1994-12-20
1998-07-28
Lee, Thomas D.
Facsimile and static presentation processing
Natural color facsimile
Color correction
358501, 382162, 382167, 395109, 395131, G03F 308
Patent
active
057869073
ABSTRACT:
A color compensation system maps and translates between colors and colorants with improved speed and accuracy. The invention also contemplates colorant-to-color and colorant-to-colorant translations. In one embodiment, an improved color-to-colorant map is first created by creating a multi-dimensional lattice, then dividing this lattice into sub-lattices of selected sizes. A "nominal" sub-lattice is then constructed for a given colorant. Next, that colorant is expressed as a function of color-dependent component parts, and this relationship is used to construct initial lookup tables to convert the input colors to average colorants. Then, final lookup tables are generated, one for each sub-lattice, to convert average colorants to actual colorants. The above steps are repeated for each colorant. This process effectively creates a high-speed color-to-colorant map. After the improved map is created, it is implemented in a processor, which uses the map during translation. When the processor is conducting a translation, the processor first determines the average value of a selected one of the colorants by processing its input colors with an initial lookup table. Next, the processor identifies the applicable sub-lattice for one of the colorants, and applies the lookup table of the identified sub-lattice to receive the actual colorant. After the processor repeats these steps for the remaining colorants to complete the translation, the resultant colorants may be displayed with an output device.
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International Business Machines - Corporation
Lee Thomas D.
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