Abstract: A process for analyzing the contents of containers comprising obtaining a first image of the container, tilting the container, obtaining a second image of the contents of the container in the tilted position, overlaying the first and second images, and subtracting one image from the other so that contents that remain horizontal are identified and objects that tilt are substantially erased from view in the final differenced image. In one method, the container is manually or mechanically moved relative to the image taking device, such as a digital radiography device. In another method, in order to avoid parallax problems, the container and image taking device are moved together. Computed tomography can be used in combination to obtain more characterization of the contents including shapes, densities, atomic numbers, wall thicknesses, and the like.