1. A method of processing a plurality of digital images, the method comprising: a) receiving an ordered collection of a plurality of input digital images; b) identifying a first digital image from the plurality of input digital images as a base image; c) forming an empty image strip; d) appending the base image to the image strip; and e) for each additional digital image from the plurality of input digital images, i) computing a difference image from the base image and the additional digital image, and ii) appending the computed difference image to the image strip.