Four nearly identical versions of an ancient printed book, the Song of Enlightenment with Commentaries by Buddhist Monk Nammyeong Cheon (南明泉和尙頌證道歌), were examined by image analysis and comparisons to identify whether they are the identical versions or different versions in terms of printing techniques. Two out of four versions have been designated as Korean treasures and the other two versions are currently being examined for designation as Korean cultural properties.