1. An image forming apparatus comprising: reading means for reading a document; image processing means for processing image data read by the reading means; image forming means for forming an image on an image formation medium based on the image data processed by the image processing means; image formation condition-producing means for producing an image indicative of operating conditions of at least one of the reading means, the image processing means and the image formation means; and means for controlling the image forming means to form the image from the image formation condition-producing means on the image formation medium.