1. A method for calibrating information regarding a photographic image in an image information detecting method of the type in which light transmitted from an original film is received by an image sensor, and image information of the original film over an entire area from which said image sensor receives light is detected from respective picture elements which are divided into a plurality of segments, the image information comprising a plurality of pieces of data, the pieces of data corresponding to the plurality of segments of the picture elements; the method comprising the steps of: detecting image information of a reference film in place of the original film using the image sensor, the image information comprising a plurality of pieces of data, the pieces of data corresponding to the plurality of segments of the picture elements; storing the detecting image information of the reference film as data for calibration; comparing the pieces of image data of the original film detected by said image sensor with the corresponding pieces of data for calibration; and subtracting the pieces of data for calibration from the corresponding pieces of image data of the original film so as to thereby accurately obtain calibrated image information.