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Color printing

  • US 7,508,558 B2
  • Filed: 05/18/2005
  • Issued: 03/24/2009
  • Est. Priority Date: 05/18/2005
  • Status: Active Grant
First Claim
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1. A computer operable method of processing cyan, magenta, and yellow color values C1, M1, Y1, comprising:

  • receiving input values C1, M1, Y1 through use of input means;

    transforming the C1, M1, Y1 color values color values cyan, magenta, and yellow color values C, M, Y in such a manner that each of C, M, Y is not greater than a predetermined maximum value VMAX;

    obtaining blue, cyan, and magenta output color values by setting B=0, Cout=C, and Mout=M;

    if the sum C+M is greater than VMAX, obtaining blue, cyan and magenta output color values B, Cout, Mout such that B+Cout+Mout=VMAX;

    half-toning B, Cout, Mout, and Y using a first threshold array A1 for B, Cout and Mout, and a second threshold array A2 for Y, wherein the second threshold array A2 is a replica of the first threshold array A1, derived by shifting the first threshold array A1 by a predetermined number of pixels in one of a horizontal/vertical, a left/right, or an up/down direction, and wherein the first threshold array A1 and the second threshold array A2 are uncorrelated.

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