An image forming apparatus includes a storage unit that stores generated image data, a first processing unit that, based on the image data stored in the storage unit and setting information, performs image processing according to a type of sheets stored in a first sheet feed cassette for printing of an Nth copy, a second processing unit that, based on the image data stored in the storage unit and the setting information, performs image processing according to a type of sheets stored in a second sheet feed cassette for printing of an (N+1)th copy, and a printing unit that prints image data processed by the first processing unit on a sheet fed from the first sheet feed cassette, and prints image data processed by the second processing unit on a sheet fed from the second sheet feed cassette.