1. A method of detecting defects in printed images comprising: operating a printer to form a first printed image and a second printed image on at least one image receiving member, the second printed image being a duplicate of the first printed image; generating first image data corresponding to the first printed image; generating second image data corresponding to the second printed image; generating difference data corresponding to a difference between data corresponding to the first image data and data corresponding to the second image data; and identifying a defect in the second printed image from the difference data.