1. An image processing apparatus comprising: a determining unit that determines a color of a character; a color converting unit that converts color data into two-color data having a black color and a predetermined color based on the color of the character; and a processing unit that processes either one of a color character and a black character determined by the determining unit, wherein the color converting unit converts a chromatic color having a predetermined hue into the predetermined color and a chromatic color having a hue other than the predetermined hue and an achromatic color into the black color, and the processing unit that performs a predetermined process on either one of the color character and the black character such that the color character having the chromatic color converted into the black color is relatively noticeable to the black character.