Sughrue, Rothwell, Mion, Zinn & Macpeak
Method for controlling the quantity of exposure in photographic printing
 An improved method for controlling the quantity of exposure in photographic printing to obtain high-quality prints is disclosed. The method is carried out by photoelectrically detecting a plurality of optical densities from a principal portion of a negative film then discriminating the maximum value and the minimum value of the photoelectrically detected optical densities. The difference between the maximum and minimum values is calculated to achieve a first output, and the first output is non-linearly converted and combined with the maximum or minimum value output to achieve a third output for controlling the quantity of exposure. The method provides satisfactory prints even from those negative films having principal subject density failures or color failures. 
Fuji Photo Film Co., Ltd.
G G
G03B G03B
inventional inventional
Takaaki Taizo Shigeru
Terasita Akimoto Watanabe