Printing black and white reproducible color documents
First Claim
Patent Images
1. A document reproduction system, for reproducing a color document in a format enabling improved black and white copying retaining color intent of the color document, including:
- a document input, receiving electronic documents having image areas therein designated to be printed in a plurality of colors;
an image processing unit, processing said documents for printing and converting each color into a set of repeated patterns, each set of repeated patterns unique to a single color and corresponding to a basis color set, said patterns varying with the a density of color in a corresponding area in the document;
a printer, reproducing said image areas with, whereby patterns for each color are added together to form a final image, which when copied, retains color intent in terms of differentiation of areas of color;
where said printer is a color printer, printing each color with a single colorant in a limited set of thereof.
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Abstract
A color image is reproduced with a set of colors wherein each color is defined in terms of a pattern block. Pattern blocks include a pattern using the color to be reproduced and white in density-related combinations so that the luminance difference between the color and white can be retained when copied or printed with a black printer. The patterns add among colors thus allowing combination colors to be represented in terms of added patterns of colors represented in black as distinct patterns.
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Citations
14 Claims
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1. A document reproduction system, for reproducing a color document in a format enabling improved black and white copying retaining color intent of the color document, including:
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a document input, receiving electronic documents having image areas therein designated to be printed in a plurality of colors; an image processing unit, processing said documents for printing and converting each color into a set of repeated patterns, each set of repeated patterns unique to a single color and corresponding to a basis color set, said patterns varying with the a density of color in a corresponding area in the document; a printer, reproducing said image areas with, whereby patterns for each color are added together to form a final image, which when copied, retains color intent in terms of differentiation of areas of color; where said printer is a color printer, printing each color with a single colorant in a limited set of thereof.
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2. A method for reproducing a color document in a format enabling improved black and white copying retaining color intent of the color document including:
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receiving electronic documents having image areas therein designated to be printed in a plurality of colors; defining for a preselected color, a pattern block unique to said preselected color; forming a representation of said image areas in terms of repetitions of said pattern blocks defined for each color, each repetition of a pattern block varying with any density change within the image areas; printing said electronic document with each of said representations in superposed relationship. - View Dependent Claims (3, 4)
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5. A method for reproducing a color document in a format enabling improved black and white copying retaining color intent of the color document including:
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receiving electronic documents having image areas therein designated to be printed in a plurality of colors; defining for said preselected colors, a pattern block unique to said preselected color; performing a full undercolor removal operation on said images areas, whereby any pixels in the image area are defined by two of said preselected colors and black; forming a representation of each color corresponding to the remaining preselected colors and black in terms of repetitions of said pattern blocks defined for each color, each repetition of a pattern block varying with any density changed within the image areas; printing said electronic document with each of said color representations in superposed relationship. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for reproducing a color document in a format enabling improved black and white copying retaining color intent of the color document including:
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a document input, receiving electronic documents having continuous tone image areas therein designated to be printed with a plurality of colors; defining for a preselected color, a screen pattern unique to said preselected color; screening each color, using said unique screen patterns therefor to quantize said pixels, forming a representation of each color terms of repetitions of said pattern blocks defined for each color, each repetition of a pattern block varying with any density changes within the image areas; printing said electronic document with each of said color representations in superposed relationship.
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13. A method for reproducing a color document on a black and white printer in a format enabling improved black and white copying, while retaining color intent of the color document including:
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a document input, receiving electronic documents having image areas therein designated to be printed in a plurality of colors; defining for a preselected color in a set of basis colors, a pattern block unique to said preselected color; forming a representation of each of said plurality of colors in terms of repetitions of said pattern blocks defined for each preselected color, each repetition of a pattern block varying with any density change within the image areas; combining said representations into a single representation suitable for printing on a black and white printer, and printing said representation. - View Dependent Claims (14)
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Specification