专利汇可以提供Photographic color enlarging system专利检索,专利查询,专利分析的服务。并且A self-contained photographic enlarging system for making a color print from a conventional color negative wherein a sample from the source of printing light is taken from within the enlarger, after passage through the negative and before projection through the projection lens and is converted into three electrical color signals respectively representative of the cyan, magenta and yellow colors in the negative to be enlarged. Each of said respective color signals thereafter is combined with a reference voltage pre-established as being of an absolute magnitude equal to the desired color signal for providing the correct printing for that color in the negative from which the sample was taken to produce a color error signal of a magnitude equal to the differences between the color signal voltage for that color and the reference voltage, and of a polarity of the larger of the two. Said error signals are automatically applied in the system, to alter the proportion of each color in the printing light before its passage through the negative, to make a print in which the colors are balanced.,下面是Photographic color enlarging system专利的具体信息内容。
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