An example image forming apparatus includes a communicator to receive print data, an image forming unit, and a processor to control the image forming unit to perform image processing on the received print data and control the image forming unit to print the image-processed print data. When the received print data is not a scan file, the image processing is performed at a first level and when the received print data is a scan file, the image processing is performed at a second level, the second level being higher than the first level.