Photographic printing process using white light - computes exposure times of three prim. colours based on measurement of e.g. densities at original for prim. colours

摘要

Three colour components of the white light are blocked independently corresp. to the exposure times with the help of three colour filters (21-23). A total amount of white light for an exposure is set, such that an exposure for any primary colour, the exposure time of which is the shortest of the three prim. colours, terminates following the end of the computing of the exposure times for the three prim. colours. An adjustment of a white light source for the prodn. of the total amount of white light is set in hand before an end of a computation of the exposure times for the three prim. colours. A total amount of white light for an exposure on the basis of results is computed, so that an exposure for a prim. colour, the exposure time of which is the shortest of the three prim. colours, terminates after an end of the computing of the exposure times for the three prim. colours and the white light source for the prodn. of the total amount of white light is adjusted. USE/ADVANTAGE - Photographic printing process. Exposure is effected in short time span, resulting in exposures with higher efficiency.