An electrophotographic image forming apparatus for forming an image in accordance with image information includes: an image forming unit configured to form an image that is uniform in area percentage of each of primary colors and a secondary color on an intermediate transfer belt; a measurer configured to measure amounts corresponding to density distribution of residual toner left on the intermediate transfer belt, on which the image uniform in area percentage of each of the primary colors and the secondary color is formed and from which toner is transferred onto a recording medium, in the main-scanning direction; and a corrector configured to correct a tone value of the image information so as to reduce density nonuniformity of a streak region observed in the density distribution in the main-scanning direction using the amounts measured by the measurer.