1. A printing system that combines features of a first bitmap image and features of a second bitmap image, the printing system comprising: a print engine; and a print controller operable for: receiving the first bitmap image as a background of a form, the bitmap image including a plurality of printable features corresponding to positions of the bitmap image; receiving the second bitmap image as fill-in data to be filled in to the form, the second bitmap image including a second plurality of printable features corresponding to positions of the bitmap image, wherein the second plurality of printable features each have an assigned ink transparency; blending a feature of the first bitmap image with a corresponding feature of the second bitmap image based on the assigned ink transparencies to form a blended feature; and combining the blended feature to form a blended image that blends the first and the second bitmap images and is suitable for printing.