1. A method for processing an image to be printed on a page, the image having portions of a combination color comprising primary colors, the method comprising steps of: determining which portions of the image use the combination color; determining edges of the portions of the image; reducing the primary colors by a predetermined amount along selected edges based on an offset value and the combination color; processing the image to obtain pixel values corresponding to drops of printing fluid to be emitted during printing of the image; and, emitting the drops such that drops of the printing fluid of one of the primary colors is offset from drops of another primary color based on the offset value to print the portions of the image.