CRISTAL: Image Processing Graphic simulations are useful in re-creating the past appearance of an architectural resource, or in depicting the visual impact of contemporary design proposals. Using the image processing capabilities of the prototype system, the colors, structure, and form of a building image can be restored according to evidence gathered from various analytical techniques and historical reference sources, such as photographs and sketches of the building's original appearance. This simulation method was used to depict the historic appearance of the Hull House, a c.1840 "dog-trot" cabin, by using the Truevision Image Processing System (TIPS) software from AT&T Truevision. The TIPS software provides the capability of painting over an image, cutting and pasting pieces of images together, manipulating image colors, and other image processing functions. Based on the historical evidence, an image of the original Hull House was created by using the TIPS software to edit and manipulate images of the existing house. The processed image was then stored as a new, individual file in the information base to serve as a visual reference to supplement the Hull House historical record. CRISTAL: Image Analysis CRISTAL: Resolution