An image inspection apparatus that compares a reference image with an inspection image obtained by scanning a printed medium on which the reference image has been printed, to determine whether the printed medium is acceptable is provided. The image inspection apparatus includes a first inspecting unit that compares the reference image exclusive of an edge in the reference image with the inspection image exclusive of an edge in the inspection image to perform inspection; a line-image detecting unit that detects a line image that contains the edge from each of the reference image and the inspection image; a second inspecting unit that compares the line image detected from the reference image with the line image detected from the inspection image to perform inspection; and a determining unit that determines whether the printed medium is acceptable based on results of these inspections.