In order to correct for colors of images taken photographs of e.g., patient's skin in a clinical medicine, the method of the present invention comprises a color chart for image correction including a sheet base substrate, on the back surface of which an adhesive layer capable to adhere onto an object such as the patient's skin and color materials for example three colors R, G, B as three primary colors of lights applied on the surface to be captured in a color image with the object to correct for colors in an entire image according to basic colors indicated in the captured color regions.