A satisfactory simulation image is provided regardless of an output object observation environment and a display object observation environment. The image processing method for simulating an image output from an image output device in advance includes the steps of: performing a color correction process in accordance with an output object observation environment when an image output from the image output device is observed; and performing a color correction process on image data on which the color correction has been performed in accordance with an output object observation environment and a display object environment when a simulation image is observed.