Patent ID: 6556793
Filing Date: 2003-04-29
Classification: H04N

Abstract:
An image forming apparatus comprising:concentration pattern data producing means for producing reference concentration pattern data and adjustment concentration pattern data, the reference concentration pattern data representing a predetermined reference concentration and the adjustment concentration pattern data representing a plurality of concentrations within a predetermined concentration range including the predetermined reference concentration; printing means for printing an adjustment sheet based on the reference pattern data and the adjustment concentration pattern data so that a reference pattern and a plurality of test patterns are printed on the adjustment sheet, the reference pattern indicating the predetermined reference concentration and the test patterns indicating the concentrations indicated by the adjustment concentration pattern data; and concentration adjusting means for adjusting concentration data of image data to be printed in accordance with an adjustment concentration value detected by comparing a concentration of the reference pattern with concentrations of the test patterns printed on the adjustment sheet, wherein said concentration pattern data producing means produces the reference concentration pattern data and the adjustment concentration pattern data so that one of a color of the reference pattern and a color of the test patterns is added to the other of the color of the test pattern and the color of the test patterns.