Patent ID: 7508558

Claim:
A computer operable method of processing cyan, magenta, and yellow color values C 1 , M 1 , Y 1 , comprising: receiving input values C 1 , M 1 , Y 1 through use of input means; transforming the C 1 , M 1 , Y 1 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 A 1 for B, Cout and Mout, and a second threshold array A 2 for Y, wherein the second threshold array A 2 is a replica of the first threshold array A 1 , derived by shifting the first threshold array A 1 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 A 1 and the second threshold array A 2 are uncorrelated.