1. An image file processing method adopted in an image file processing apparatus including a processing unit, comprising steps for: inputting an image file into the image file processing apparatus by the processing unit; making a decision as to whether or not a standard of recording method used in the image file is a predetermined standard that is newer than a conventional standard based upon a compatibility identification information; making a decision by the processing unit as to whether or not the input image file uses a specific color space based upon color space identification information that is stored in the input image file and that includes a first information that indicates the specific color space being used in the input image file or a second information that indicates a color space other than the specific color space being used in the input image file if the standard of recording method used in the image file is the predetermined standard; converting by the processing unit the specific color space to a color space suitable for processing to be executed in the image processing apparatus by using a first conversion information stored in advance in the image processing apparatus if the color space identification information is determined to include the first information; and converting by the processing unit a color space used in the input image file to the color space suitable for the processing to be executed in the image processing apparatus by using a second conversion information stored in the input image file if the color space identification information is determined to include the second information, the second conversion information being information different from the color space identification information.