1. An image inspection apparatus for determining whether a test image is a copy of an original image, comprising: an image group generation unit that receives the original image to determine one or more types of image transform, and performs the one or more types of image transform on the original image according to the determined types of image transform within a color space to generate an original image group, wherein the original image group comprises the original image and a plurality of images generated by said transforming; a spatial color difference computing unit that transforms the color space of each of the images in the generated original image group to a common color space for calculating first spatial color differences, and calculates the first spatial color differences between the original image and images among the images in the original image group generated by the one or more types of image transform performed by the image group generation unit to provide color difference data corresponding to the first spatial color differences; an image inspection unit that receives the test image and the original image group and calculates second spatial color differences between the test image and the images in the original image group, and compares the second spatial color differences to the color difference data corresponding to the first spatial color differences to generate a comparison result, wherein the image inspection unit includes an image input unit that receives the original image group, the test image, and the color difference data corresponding to the first spatial color differences; and an inspection result output unit that outputs the comparison result.