1. An image processing method for processing an input image that contains a plurality of objects comprising the steps of: inputting rendering command statements that specify rendering of the plurality of objects; analyzing the rendering instructions; identifying the types of objects; and if a specific type of object is identified through the identification step, re-inputting the rendering command statement that specifies rendering of the specific type of object so as to correct the specific type of object, wherein if the specific type of object is not identified through the identification step, a rendering command statement needed for execution of image correction is not re-input.