1. A method of storing a plurality of digitized images comprising the steps of: (a) providing each digitized image of said plurality of digitized images as a respective multi-spatial resolution digital image file, said multi-spatial resolution digital image file containing plural digital images corresponding to said each digitized image and having respectively different spatial resolutions, the plural digital images of a respective multi-spatial resolution digital image file containing a first digital image having a first spatial resolution and a second digital image having a second spatial resolution lower than said first spatial resolution; (b) storing each multi-spatial resolution digital image file provided in step (a) at first respective storage locations of a digital data storage medium; and (c) storing, in a second storage location of said digital data storage medium, which second storage location is separate from said first respective storage locations thereof, a separate image index file which contains a duplicate copy of each of the second digital images contained in said multi-spatial resolution image files.