1. A method of evaluating print quality, the method comprising: measuring a reflectance of printed dots by scanning a medium on which the dots are printed according to pattern data of an ideal shading model having a predetermined pattern of a highlight region and a shadow region of at least one resolution; classifying pixels of a scan image based on the measured reflectance as a highlight region or a shadow region, by mapping the scan image onto the ideal shading model; determining an average of reflectances of the highlight region of the classified pixels in the predetermined pattern and an average of reflectances of the shadow region of the classified pixels thereof; determining a contrast value from a difference between the average of the reflectances of the highlight region and the average of the reflectances of the shadow region; and determining an indicator of the print quality based on a resolution limit or an area obtained using the contrast value.