Efficient under color removal
AssigneeTexas Instruments Incorporated
InventorsSanthosh T. N. Kumar, Venkat V. Easwar
Life of this patent
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Abstract
A method of performing color space conversion and under color removal. Pixelated data is first resampled (102) to an efficient word size—typically 8-bits wide. The RGB color format data words are then subtracted from a maximum intensity to yield CMY color format data words. The minimum value of the three intensity words for each pixel is determined and used as an initial black value. A scaled version of the initial black value is then subtracted from each of the four CMYK intensity words (104). The resulting CMYK values are then limited to a range bounded by the maximum and minimum producible intensities for each color.
Claims12
A method of performing color space conversion and under color removal, said method comprising the steps of:
- providing an intensity word for each of a first, second, and third color for each of four pixels;
- subtracting each said intensity word for each of said first, second, and third colors from a maximum intensity word to obtain a complementary color initial intensity word for each of said first, second, and third complementary colors for each of said four pixels;
- setting a minimum color intensity word for each pixel equal to a minimum of said first, second, and third complementary color initial intensity words;
- setting an initial combined color intensity word for each of said four pixels equal to said minimum color intensity word for each pixel;
- generating an output intensity word for each of said first, second, and third complementary colors for each of said four pixels, each of said output intensity words for each of said first, second, and third complementary colors equal to said initial complementary color intensity word minus a scaled value of said initial combined color intensity word, each of said output intensity words for each of said first, second, and third complementary colors limited to a range bounded by a minimum and maximum producible intensity for each of said first, second, and third complementary colors;
- and
- generating an output intensity word for said combined color for each of said four pixels, said output intensity word for said combined color equal to a scaled value of said initial combined color intensity word and limited to a range bounded by a minimum and maximum producible intensity for said combined color.
Dependencies are inferred from the claim text.