METHOD OF SPECTROGRAPHICALLY MEASURING DENSITY OF PHOTOGRAPHIC NEGATIVE COLOR FILM

摘要

ABSTRACT OF THE DISCLOSUREAn improved method of spectrographically measuringdensity of a strip of photographic negative color film isdisclosed. The method includes the steps of concurrentlybuilding projection image of the photographic negativecolor film with certain image recorded thereon on each ofa plurality of smaller divisional light beam receivingfaces on an image taking element with the aid of a pluralityof projection optical systems including color separatingmeans for separating projected light into three primarycolors, electrically scanning a number of photoelectricconverting elements on each of the smaller divisional lightbeam receiving faces, converting output signal obtained byelectrical scanning on each of the smaller divisional lightbeam receiving faces and storing it, and measuring relativedensity, degree of saturation and average density withrespect to a part on the photographic negative color filmcorresponding to each of the smaller divisional light beamreceiving faces with reference to thus stored result. Thesmaller divisional light beam receiving faces are preparedby dividing a light beam receiving face having a largenumber of photoelectric converting elements distributedthereover in the two-dimensional manner and the number ofthe smaller divisional light beam receiving faces is sameto that of the projection optical systems.