An image processing method includes the steps of acquiring a captured image generated through image capturing using an optical system, performing first shaping processing so as to reduce a difference between a maximum value and a non-maximum value for data generated using information of a point spread function of the optical system corresponding to an image capturing condition of the captured image, performing rotating processing according to a position of the captured image for the data after the first shaping processing, and performing sharpening processing of the captured image using the data after the rotating processing.