Patent Document ID: 20050099455
Application ID: 10871992
Patent Status: 0

Claim One:
1. A method for converting a full color image to a two-color image in a two-color printer, comprising: providing means for printing black pixels and pixels of an alternate color on a substrate having a background color; determining whether pixels in the full color image are black pixels, white pixels, alternate color pixels, or other color pixels; printing black pixels of the full color image as corresponding black pixels in the two-color image; printing alternate color pixels of the full color image as corresponding alternate color pixels in the two-color image; inhibiting printing in pixel areas of the two-color image which correspond to white pixels of the full color image such that the white color pixels of the full color image appear as corresponding background colored pixel areas of the substrate in the two-color image; employing a dithering algorithm for converting other color pixels of the full color image into said two-color image by one of: (a) utilizing a combination of corresponding background colored pixel areas of the substrate and printed alternate color pixels in the two-color image; or (b) utilizing a combination of corresponding printed black and printed alternate color pixels in the two color image.