The conventional color film inspection system does not consider calibration of an image input unit at all. It therefore cannot maintain precision at a sufficiently high level against shifts caused by gains or offset fluctuation. This invention system can prevent deterioration in inspection precision against gain drift or offset drift as it is adapted to calibrate the input unit. Further, as this invention system can obtain in advance the correspondence between images displayed in the color film inspection system with images actually printed, the original images on a negative film, if once inspected optimally, can always be printed optimally.