Method of controlling a colour image forming apparatus

摘要

A method of controlling a colour image forming apparatus capable of preventing an image from being distorted at a boundary of a colour image region due to misregistration to improve printing quality. The method includes determining whether original image data is in a colour image region, detecting boundary region information on a plurality of colour channels when the original image data is in the colour image region, selecting a channel to be extended using the detected boundary region information, and extending the selected channel.