Patent ID: 7589862

Claim:
A density correction apparatus for an object, comprising correcting means for, when generating data for printing a tint block image, which is composed of two areas, one of the two areas remaining in a duplicate when being copied and the other of the two areas disappearing in the duplicate or becoming too light-colored to recognize compared to the area remaining in the duplicate, and the object in a superposed manner upon the tint block image, correcting the density of the object in accordance with the tint block image, wherein the density of a printed image, which is made by printing the object whose density has been corrected by said correcting means and the tint block image in a superposed manner, is higher than a density of the tint block image in the printed image, wherein said correcting means calculates the density based on an expression (the maximum density−the predetermined density higher than the density of tint block image)×the density of the object, for correcting the density of the object.