Patent ID: 8712265

Claim:
An image forming apparatus, comprising: an image carrier that carries a toner image; a sensor that detects measurement light from a test pattern on a surface of the image carrier for density adjustment; and a density adjustment unit that causes to form a cleaner toner image on the surface of the image carrier and remove the cleaner toner image for the density adjustment, and causes to form the test pattern after removing the cleaner toner image, the cleaner toner image covering a whole area on which the test pattern may be formed; wherein: the density adjustment unit identifies toner density of the test pattern on a measurement area, and performs the density adjustment based on the toner density, and the toner density is identified from an output value of the sensor corresponding to the measurement light from the measurement area before the test pattern is formed after the cleaner toner image is removed, and an output value of the sensor corresponding to the measurement light from the measurement area which carries the formed test pattern.