Method and apparatus for forming color image

摘要

A color image forming apparatus that forms a multitone image from image data includes a converter that converts multitone image data of respective colors into binary or multinary quantized image data, a screen forming unit that forms at least three screens representing different colors based on the quantized image data, and a superposing unit that superposes the screens formed by the screen forming unit to form a color image. The screen forming unit forms the screens such that a minimum angle difference among angle differences of predetermined three screens is larger than 45 degrees when the superposing unit superposes the screens.