1. A method of image processing for executing an image analysis comprising: attaching image enhancement processing information to an image processed for enhancement specifying image enhancement processing which the image has undergone; obtaining from the image, with image processing information obtaining means of a system for executing an image analysis, the image enhancement processing information attached thereto; correcting the image on the basis of the image enhancement processing information so that the image approaches to an image optimal to the image analysis; and executing image analysis on the corrected image.