Patent ID: 8599456

Claim:
An image processing apparatus comprising: a two color process section that converts input image data of RGB inputted by reading an original document into image data of CMY used to output a two-color image containing two colors which are a chromatic color and an achromatic color, the two color process section including: a luminance and chroma calculation section that calculates a luminance value and a chroma value based on the input image data of RGB; an image-data determination section that determines the input image data, the chroma value of which is equal to or greater than a predetermined threshold, as first input image data constituting the chromatic color in the two-color image and determines the input image data, the chroma value of which is less than the threshold, as second input image data constituting the achromatic color in the two-color image; and an output-color generation section that generates, with respect to the first input image data, the image data of CMY by adding the luminance value to the chroma value for each color component of CMY and generates, with respect to the second input image data, the image data of CMY composed of the luminance value for each color component of CMY.