In the process of control of an image scanning device that creates image data by scanning an image from a recording medium on which the image is recorded, the image scanning device is controlled to acquire first image data by scanning the image at a first scanning resolution; image type is judged on the basis of this first image data; and in the process of controlling the image scanning device to scan the image at a second scanning resolution, second image data is acquired under image acquisition conditions dependent on the image type indicated by the judgment result in the image judgment step.