An image processing method is provided for an image processing device which processes images of printing data input from a computer device and an image input device via a predetermined communication line or a network. Printing instruction information of the printing data is analyzed, and determination is made as to whether a request for color matching processing based on a profile describing input color characteristics of an image input device and output color characteristics of an image output device is included in the printing instruction information. In the case that a request for the color matching processing is included in the printing instruction information, color matching processing is requested to be performed by the computer device on the network.