An image processing apparatus is configured to capture an object image, generate a RAW image, perform simple development on the RAW image during the image capturing operation, and store not only the developed image but also the RAW image. In a predetermined interval, in an idle state, or in predetermined enlargement processing, the image processing apparatus reads a RAW file stored in a storage medium and performs high-quality image development to generate an image having higher image quality than that obtained by the simple development. If development processing has been completed by a high-quality image development unit, the image processing apparatus replaces the image obtained by the simple development with the image obtained by the high-quality image development and reproduces the image obtained by the high-quality image development.