An image processing apparatus for applying to a color image a pattern corresponding to a color of the color image includes a pattern determination section that determines a hatch pattern having a foreground and a background which serves as a pattern in accordance with a color of a pixel in the color image, a color value determination section that determines a color value of a color material to be assigned to the foreground and the background in the hatch pattern, and an image processing section that replaces the color of the pixel in the color image with a color value of a color material, the color values of the foreground and the background in the hatch pattern are different, and the color value determination section determines the color value of the color material per unit area in the hatch pattern determined such that a chromatic value.