Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-06-20
1990-06-12
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 80, 355 40, 355328, G03B 2772
Patent
active
049337548
ABSTRACT:
A system for adjusting the density or contrast of a photographic print includes a projection lens system (18) for projecting an image from a negative (10) onto photosensitive paper (20). A matrix array (24) of 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 upon 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 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 the LCD elements.
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Maginness Maxwell G.
Reed William G.
Britton Howard W.
Ciba-Geigy Corporation
Powell Mark R.
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