METHOD AND APPARATUS FOR PRODUCING MODIFIED PHOTOGRAPHIC PRINTS

摘要

METHOD AND APPARATUS FOR PRODUCING MODIFIED PHOTOGRAPHIC PRINTS A system for adjusting the density or contrast of a photographic print includes a projection lens system (18) for projecting an image from a nega-tive (10) onto photosensitive paper (20). A matrix array (24) of light valves, such as liquid crystal display elements, is interposed in the optical path in front of the print paper (20) and transmissivity of the individual LCD elements is controlled to provide an LCD mask to control the intensity and/or color of the light falling on the print paper (20). Preferably, a television camera (16) is used with a beam splitter (14) to provide a real-time image of either the LCD mask (24) or the combined image of the mask (24) and negative (10) to allow operator-selected adjustments in the mask (24) to be viewed as they are made. In printing black and white photos on multicontrast paper, the color transmissivity of the LCD elements is adjusted on an element-by-element basis to provide a localized adjustment of the contrast range of the print paper. Density and contrast can be simultaneously adjusted by controlling both the color balance and overall transmissivity of theLCD elements.