The image forming apparatus

The present invention discloses an image forming apparatus, the apparatus comprising: an image reader, which cover is placed on the reading surface of the image recording material with an openable cover plate, to press the reading surface, and is optically detection means for detecting the state of opening and closing of the cover plate, which follows the detection step; reads image of the image recording material; an image output unit that forms an image on a recording sheet, and outputs the image execute: the image output unit is formed on the recording sheet gradation test image, the test image formed with the gradation recording paper is placed on the reading surface of the image reader, and the ash performing a read operation of the test image; and a gradation correction unit, when the detection unit detects the closed state of the cover, the gradation correction unit based on an image read by the image reader implemented correcting the gradation of an image forming apparatus.