Color mapping to preserve detail

Details Color mapping to preserve detail Color mapping to preserve detail

1993-12-17

1996-12-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358518, G06K 1500

Patent

active

055880932

ABSTRACT:
A method and apparatus is disclosed for mapping original colors of image elements forming a color image to colors that appear solid when reproduced on a color printer. The original color and the solid color of each image element may be defined by a subtractive mixture of cyan, magenta and yellow colorants. The method first determines whether the original color of each image element is a light color surrounded by a dark background color, or a dark color surrounded by a light background color. Subsequently, the cyan and magenta colorants of each original color determined to be a light color surrounded by a dark background color are minimized; and one of the cyan or magenta colorants for each color determined to be dark and surrounded by a light background color is maximized. Consequently, image elements having colors defined by the mapping appear solid when reproduced by the color printer.

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Color Encoding Standard, Xerox System Integration Standard, Xerox Corp. Palo Alto, California, Jul. 1991 XNSS 289107 ("The Xerox Color Encoding Standard").

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