1. An imager comprising: an imaging sensor that creates an image signal by photographing a subject; an image processor that processes the image signal with visual effects process so as to create image data, and adds metadata to the image data so as to create an image file, the metadata containing post-processing information that includes information based on the visual effects process, including parameters of the visual effects process; and a recorder that stores the image file; the visual effects process being used in processing the image data; said image processor conducting a post process in which more than one visual effects process is carried out, a new image file is created based on the visual effects process, and the new image file is stored in said recorder; the post-processing information having, a post-processing counter and pre-processing information, the post-processing, counter indicating the number of times the post process is carried out, the post processing information being added to the image file after the post process, comprising more than one visual effects process, is carried out in a same order as the more than one visual effects process is carried out and the pre-processing, information representing a state of a preprocessed image file prior to post processing; wherein the state of the preprocessed image file prior to post processing, is a location of the preprocessed image file.