1. A digital image acquisition system having no photographic film, comprising: (a) an apparatus for capturing digital images, including a lens, an image sensor and a processor; (b) an analysis tool for comparing at least a portion of a captured image and a reference image of nominally the same scene, said analysis tool providing a measure of relative differences between regions of said captured image and said reference image of groups of pixels within said scene; (c) a classification tool for segmenting a foreground region from a background region within said scene based on said measure; and (d) a depth of focus module for reducing a perceived depth of focus according to whether a candidate region appears in the foreground or background of the captured image.