There is provided an image processing method and apparatus in which an image represented by output image data can be corrected in a simple manner. After execution of pre-scan has been completed, in a set-up portion, a normal-processing parameter and a correction-processing parameter are set for each of a plurality of image processing. When an image displayed on a monitor after image processing based on a normal-processing parameter is visually observed by an operator and it is determined that correction of the image is required, at least one image processing parameter is switched to a correction-processing parameter. That is, when it is determined that correction of an image is required, a previously set correction-processing parameter is read and the normal-processing parameter is switched thereto.