Patent ID: 6870644
Filing Date: 2005-03-22
Classification: H04N

Abstract:
1. A method of color halftoning, the method comprising: performing tone dependent error diffusion with a plurality of colors correlated to determine whether to print no dots, whether to print one dot of either a first color ink or a second color ink, and whether to print two dots including one dot of the first color ink and one dot of the second color ink in approximately the same position; and correlating printing of dots of a first color with dots of a second color to reduce a likelihood that printed dots of the first color will unintentionally overlap printed dots of the second color, wherein one dot is printed if either a combined tone from the first color and the second color is greater than a full intensity threshold for a pixel or the combined tone and an accumulated error from the first color and the second color is greater than a tone dependant threshold level.