Image forming apparatus and control method thereof

摘要

An image forming apparatus is provided that uses a table generated in advance to correct a gradation characteristic of an image to be formed when carrying out image forming using an image carrier. A patch is formed in an area where the image is not formed on the image carrier. A density of the patch formed on the image carrier is measured. The table is modified based on the density of the patch that has been measured. The patch is formed concurrently with image forming of the image on the image carrier.