An image forming apparatus includes an image forming unit, an acquisition unit, and a control unit. The image forming unit forms an image on a sheet based on a gamma correction table. The acquisition unit acquires information on a sheet. The control unit controls the image forming unit. The image forming unit forms a first image indicating first image data on a sheet. The acquisition unit acquires the information on the sheet from the first image. The control unit creates second image data for creating a gamma correction table based on the information on the sheet.