Abstract: A technique for use in a direct digital color proofing (DDCP) system (500) for printing a "modelling" color(s) in a halftone color proof image such that the modelling color simulates a ("special") color that does not lie within a gamut of colors reproducible through only primary color (e.g. cyan, magenta, yellow and black) halftone printing. Specifically, a wide range of such modelling colors can be produced by independently and appropriately setting dot size, particularly in combination with solid area density, for the halftone dots (110, 120, 130, 140) produced for different primary colors and then printing the resulting dots on an overlaid dot-on-dot basis with proper registration. Appropriate dot gain and density look-up tables (230, 720; 240, 940) are respectively used to transform continuous tone separation values and bit-mapped data to vary dot size and solid area density of these halftone dots for each such primary color prior to printing these dots using a proofing engine.

Abstract: A microfilm camera of the continuous type in which both the document and the film move continuously during filming, includes means whereby a user operator enters a desired optical reduction ratio into the keyboard of a main or host computer associated with the microfilm camera. The main computer, through appropriate communication with a microcomputer, automatically selects a lens of the appropriate focal length corresponding to the optical reduction ratio selected, and automatically establishes the correct film transport speed in accordance with the requested reduction ratio so that the relationship between the fixed transport speed of the document and the adjusted transport speed of the film causes the film image to have the same magnification ratio in the direction of movement as it has in the transverse direction. The provision of the appropriate lens and the adjustment of the film speed are accomplished by respective motors controlled by the mcicroprocessor.