Refers to combinations of photographic images, or photographic with other images, such as architectural drawings, usually arranged into a somewhat unified image. For photographs produced by printing two or more negatives as one unified image, use "composite photographs." When pieces of photographs or other relatively flat materials are pasted together into less unified images, use "collages."

Source: Art & Architecture Thesaurus

http://vocab.getty.edu/page/aat/300134699