1. An image processing apparatus comprising: an unnecessary component determiner configured to determine unnecessary component information of a parallax image based on difference information relating to a plurality of parallax images; a reduction processor configured to perform reduction processing on at least one of the parallax image, the difference information, and the unnecessary component information; a magnification processor configured to perform magnification processing on the unnecessary component information; and an unnecessary component reducer configured to reduce an unnecessary component, based on the unnecessary component information, from the parallax image or a synthesized image obtained by synthesizing the plurality of parallax images.