An image forming system executes determination processing with an intensity of an image editing process being a first intensity and a determination threshold being a first value and does not execute the determination processing with the intensity of the image editing process being the first intensity and the determination threshold being a second value. The system executes the determination processing with the intensity of the image editing process being a second intensity greater than the first intensity and the determination threshold being the first value and does not execute the determination processing with the intensity of the image editing process being the second intensity and the determination threshold being the second value.