1. An imaging apparatus comprising: imaging means for imaging an image at a first aspect ratio; and image processing means for creating a converted image by converting an original image at the first aspect ratio, which is imaged by the imaging means, to the converted image at a second aspect ratio, which is different from the first aspect ratio, by discarding a section of the original image as a discard section, and, if the selected magnification of the converted image is lower than that of the original image, reducing the size of the original image according to the magnification and then adding a margin to the reduced original image and discarding the discard section according to the magnification as necessary.