1. An imaging apparatus, comprising: a first imaging device which takes an image of an object under imaging conditions with relatively high sensitivity to acquire high-sensitivity image information; a second imaging device which takes an image of an object under imaging conditions with relatively low sensitivity to acquire low-sensitivity image information; a reduced image generation device which generates a reduced image only from one of the high-sensitivity image information acquired by the first imaging device or the low-sensitivity image information acquired by the second imaging device; and a recording processing device which records first RAW data indicating the high-sensitivity image information acquired by the first imaging device, second RAW data indicating the low-sensitivity image information acquired by the second imaging device and the reduced image data generated by the reduced image generation device in association with one another.