Bound document with transparent overlay sheet

Abstract

A bound document including a non-transparent image sheet having at least one printed image formed by printing a digital image file and an overlay sheet bearing an overlay image. The image sheet and the overlay sheet are bound together in respective spine areas thereof, so that the image sheet can be viewed either directly or through the overlay sheet, the printed image being at least partially visible through the overlay sheet. The overlay image includes at least some image content that is the same as corresponding image content in the printed image, the image sheet and overlay sheet being bound so that the image content in the overlay image is substantially in register with the corresponding image content in the printed image.

Dependencies are inferred from the claim text.