To provide an image processing system that reproduces a color of an object with fidelity in the case of converting an image of a photo or the like photographing the object into a print image or the like and to provide an image conversion method and a recording medium that records a color reference chart and a program used for the conversion.

A computer 3 reads CMYK image data with a chart (step 201). Color arrangement information of the chart is given to the computer 3 (step 202) and the computer 3 uses the color arrangement information to recognize the chart part. Whether or not the chart exists in the image is decided (step 203), and when the chart exists in the image, the shape, the size and the position of the chart are recognized, and a replaced image 6 is modified in matching with the chart and the modified image 6 is replaced with the chart part (step 204).