Abstract: A digital camera, a file output method, a file output program, and an image data structure for shortening the time required for displaying the frequency distribution of gray scale levels of a subject image are provided. A digital camera characterized by an image capturing unit converting a subject image into image data; a storage unit storing the subject image as the image data output from the image capturing unit; a count unit counting the frequency of gray scale levels of the subject image stored in the storage unit for each predetermined section; and an output unit storing the subject image stored in the storage unit and the frequency for each predetermined section counted by the count unit in one file and outputting the file.