Since the development of infrared reflectography for the study of paintings, the working document, or the infrared reflectogram assembly, has been produced by an arduous and painstaking process. Individual sequential images of a painting's underdrawing are photographed from a monitor screen in overlapping segments which, when developed and printed, must be spliced together to create a photomontage of the complete image selected. To address this problem, the Metropolitan Museum of Art initiated a project in collaboration with the National Gallery of Art and the Amparo Corporation to by-pass the photographic method of recording the underdrawing of a painting, intending to achieve the desired result by computer programming. The outcome of this effort, which brought together the expertise of an art historian, physical scientist, paintings conservator and two computer scientists, is now ready for presentation and critical discussion.