1. A method of creating a conversion table showing a relationship between scanned data and print data to be created by a color copier, the method comprising: a first step of measuring, by using a calorimeter, a plurality of colors in an original image to obtain calorimetric data of the plurality of colors on the original image, and reading, by using a color copier, the plurality of colors in the original image to obtain scanned data of the plurality of colors on the original image, thereby determining a first relationship between scanned data and colorimetric data for the plurality of colors in the original image; a second step of printing, by using the color copier, a plurality of sets of predetermined print data indicative of another plurality of colors, and measuring the print results, by using the calorimeter, to obtain calorimetric data for the printed results of the plurality of predetermined print data sets, thereby determining a second relationship between the plurality of sets of predetermined print data and colorimetric data for the printed results of the plurality of predetermined print data sets; a third step of determining a third relationship between colorimetric data for the plurality of colors in the original image and print data for reproducing the plurality of colors in the original image based on the second relationship, and determining a fourth relationship between scanned data desired to be obtained by a copy result of the plurality of colors in the original image and print data for reproducing a desired copy of the plurality of colors in the original image based on both of the third relationship and the first relationship; and a fourth step of creating, based on the fourth relationship, a conversion table showing a relationship between scanned data to be obtained by the color copier and print data desired to be obtained by the color copier.