1. An image recording apparatus for outputting a digital image on a recording medium, comprising: image designation means by which a user designates a digital image among plural digital images; correction candidate position detecting means which detects a correction candidate position in the designated digital image; schematic image preparation means which prepares a schematic image from the designated digital image, based on a contour extraction; marked schematic image preparation means which prepares a marked schematic image by synthesizing an indicator mark, indicating a correction candidate position in the correction candidate position detected by the correction candidate position detecting means; and mark sheet preparation means which prepares a mark sheet by printing the marked schematic image and mark sheet data.