1. An image processing apparatus for converting an original image, comprising: an adjustment unit configured to apply a process of blurring to the original image and a process of adjusting a density to the blurred original image to generate an adjusted image; a computing unit configured to generate a difference image that is a difference between the original image and the adjusted image obtained by the adjustment unit; and a compositing unit configured to composite the difference image and the original image based on a density of the difference image obtained by the computing unit and a density of the original image, wherein the adjustment unit adjusts a level of blurring of the original image in accordance with one of a shooting setting of the original image and an object included in the original image, the object being determined by an image analysis of the original image.