1. An electronic camera, comprising: an image pickup device which includes a light-receiving plane photoelectrically converting a subject image and allows any random partial image area to be read out from a maximal image area used to generate an image with a maximum number of pixels on the light-receiving plane; a partial image area position detecting section which detects positional data on said partial image area with respect to said maximal image area; a maximal image correcting value output section which outputs maximal image correcting values that are set based on an entire characteristic of said maximal image area and are used for image processing of image signals of said maximal image area; and an image processing section which extracts applied correcting values based on said positional data and performs image processing on image signals of said partial image area by using said applied correcting values, said applied correcting values being correcting values of said maximal image correcting values at a position corresponding to said partial image area.