1. A process for constructing a photorealistic mosaic of a target image, comprising: capturing an image of a sheet that includes a plurality of pieces of material; determining the location of each piece of material on the sheet from the captured image; extracting images of each piece of material on the sheet from the captured image; storing an image of each piece of material and information concerning the location of the piece of material on the sheet in a database; and using the images in the database and the target image to identify pieces of material to be used in the construction of the photorealistic mosaic.