An image inspection system comprising: an image reading unit (221, 222) configured to read a formed image including characters which is formed on a recording medium based on original image data to generate read image data; an acquisition unit configured to acquire the original image data; a determination unit configured to compare the read image data generated by the image reading unit (221, 222) and the original image data acquired by the acquisition unit to determine whether or not the formed image includes one or more defective regions; an extraction unit configured to extract, for a said defective region, a part of the read image data representing an image of one or more characters which are present around the said defective region and at least a part of the said defective region, from the read image data, according to a predetermined rule when the determination unit determines that the formed image includes the said defective region; and an image display device configured to display the image represented by the extracted part of the read image data, extracted by the extraction unit, wherein the displayed image shows only that part of the read formed image that is represented by the extracted part of the read image data, the displayed image showing the one or more characters which are present around the said defective region and the at least a part of the said defective region; wherein when a said defective region in the formed image overlaps with characters in the formed image, the extraction unit extracts an image of only the character which has the greatest overlap with the said defective region from among the characters in the formed image. an image reading unit (221, 222) configured to read a formed image including characters which is formed on a recording medium based on original image data to generate read image data; an acquisition unit configured to acquire the original image data; a determination unit configured to compare the read image data generated by the image reading unit (221, 222) and the original image data acquired by the acquisition unit to determine whether or not the formed image includes one or more defective regions; an extraction unit configured to extract, for a said defective region, a part of the read image data representing an image of one or more characters which are present around the said defective region and at least a part of the said defective region, from the read image data, according to a predetermined rule when the determination unit determines that the formed image includes the said defective region; and an image display device configured to display the image represented by the extracted part of the read image data, extracted by the extraction unit, wherein the displayed image shows only that part of the read formed image that is represented by the extracted part of the read image data, the displayed image showing the one or more characters which are present around the said defective region and the at least a part of the said defective region; wherein when a said defective region in the formed image overlaps with characters in the formed image, the extraction unit extracts an image of only the character which has the greatest overlap with the said defective region from among the characters in the formed image.