1. An image capturing system comprising: an image-capturing instruction unit which provides an instruction to perform image capturing in response to an operation by a user; an image input unit which inputs image data; a color-space setting unit which sets information of plural different types of color spaces; and a storage unit which receives the image data input by the image input unit and automatically stores the input image data in a form associated with the information of the plural different types of color spaces set by the color-space setting unit in response to one image-capturing instruction from the image-capturing instruction unit, wherein a file name assigned to the image data includes file name characters, file number characters, and file extension characters in order, and the file name characters are changed for each of the plural different types of color spaces.