To easily confirm image quality and to easily analyze an image by easily obtaining the image on photomechanical film.

In this image processing method, digital image data expressing the image on the process film capable of obtaining YMCK separation plates being a printing plate used for printing equal to the YMCK separation plates obtained by the actual process film can be obtained from an original for printing or image data for digital process by simulation using a computer without actually using the process film in the case of making the YMCK separation plates from the original for printing or the image data for digital process.