In the conventional technologies, it was difficult to automatically improve the quality of an image to an appropriate level that was unable to be appropriately improved during the process of producing image data in an image capturing device. According to the present invention, in order to correct the quality of an image, image data produced by an image capturing device is obtained, a conversion processing is performed that is equivalent to the reverse processing of a color adjustment processing performed by the image capturing device to produce the image data, and image quality adjusted data is produced, based on the image data, that represents an image obtained when an image quality adjustment processing was performed on the data after the conversion processing.