Patent attributes
A printing apparatus is provided with multiple achromatic color inks having different densities and at least one chromatic color ink. Diversity of dots are created with the multiple achromatic color inks on a printing medium according to image data to form a black and white image where dots are inconspicuous. Dots of the at least one chromatic color ink are created according to lightness of an image to be mixed with the dots of at least one of the multiple achromatic color inks. This technique gives a high-quality monochromatic image with hue, where dots are inconspicuous. In the case of the printing apparatus provided with multiple chromatic color inks, a ratio of densities of these multiple chromatic color inks to one another is set to express a high-quality monochromatic image with desired hues. The printing apparatus provided with three different color inks, cyan, magenta yellow, as the multiple chromatic color inks, enables color images to be printed.
