Printer independent halftone image rendering
First Claim
1. An apparatus for matching print outputs from two printers having different characteristics comprising:
- first and second printers;
a first printing decision matrix generated by a halftone process, the first printer producing a first output image in response to the first printing decision matrix; and
a second printing decision matrix generated by a process which receives as inputs an output of the first printing decision matrix and printer characteristics of each of the first and second printers, the second printer producing a second output image in response to the second printing decision matrix, said first and second output images being visually close in appearance.
1 Assignment
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Accused Products
Abstract
A method and apparatus for matching the print outputs of two printers having different characteristics. For the purpose of laser printing, or more generally for reproduction on any printing device with limited number of printing levels, a color or grayscale image has to be transformed into an array of printing decisions at each pixel of the output image. Sometimes this array is the only available representation of the original image. One may desire to print this array on a printer with different characteristics from the printer for which the array was originally prepared. The method and apparatus solve this problem by generating a printing decision matrix which takes into account the differences between the two printers.
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Citations
10 Claims
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1. An apparatus for matching print outputs from two printers having different characteristics comprising:
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first and second printers; a first printing decision matrix generated by a halftone process, the first printer producing a first output image in response to the first printing decision matrix; and a second printing decision matrix generated by a process which receives as inputs an output of the first printing decision matrix and printer characteristics of each of the first and second printers, the second printer producing a second output image in response to the second printing decision matrix, said first and second output images being visually close in appearance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for matching print outputs from first and second printers having different characteristics comprising the steps of:
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generating a first printing decision matrix by a first halftone process, the first printer producing a first output image in response to the first printing decision matrix; measuring a reflectivity of a reflectivity of printed dots on paper output from the first printer; generating a second printing decision matrix by a second halftone process where instructions from printing on the first printer are transformed into a new set of instructions for printing on the second printer such that a printed output from the second printer is visually close in appearance to a printed output of the first printer. - View Dependent Claims (8, 9, 10)
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Specification