Color printing control system and method

专利名称：Color printing control system and method发明人：Henry F. Hope,Stephen F. Hope,David

Fidelman

申请号：US06/739187申请日：19850530公开号：US04657378A公开日：19870414

摘要：A color printing control system for making prints from negatives having a colorprinter and a microprocessor. The output of photocells which read color negatives isapplied to the microprocessor enabling it to calculate print time signals. These signalsare applied, for example, to paddles and move them into the light path to terminate lightexposure. A print test probe reads the density of the prints and is coupled to themicroprocessor and forms a feedback loop which allows the microprocessor to adjust itsinternal values. In this manner, color balancing is performed and prints made from overand underexposed negatives have the same density as properly exposed negatives,without knowledge of paper characteristics and without operator setup calculations. Thisis achieved using the difference in density between a reference print and prints made bythe system as a basis for calculating correction factors which are applied to such values asslope to cause subsequent print time signals to result in correct density. The system alsocorrects color predominance in negatives where the conventional integration to graymethod would print incorrectly. In cases where color analysis indicates the possibility ofexposure under tungsten or fluorescent light an operator prompt is provided allowingthe operator to enable an appropriate correction.

申请人：HOPE INDUSTRIES, INC.

代理机构：Ratner & Prestia

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