Complementary recording system using multi-scan

An image forming apparatus wherein an image for a predetermined region of a recording material is formed by a plurality of scans of a recording head, said apparatus comprising:

• allocating means for allocating multi-level image data for the predetermined region for the scans with different ratios;
• gradation reducing means for reducing gradation of the multi-level image data allocated by said allocating means;
• and
• image forming means for forming an image having the complementary relation by driving said recording head in said scans on the basis of the image data having gradations reduced by said reducing means.

An image forming apparatus wherein an image for a predetermined region of a recording material is formed by a plurality of scans of a recording head, said apparatus comprising:

• allocating means for allocating multi-level image data for the predetermined region for the scans;
• gradation reducing means for reducing gradation of the multi-level image data allocated by said allocating means, through different processes;
• and
• image forming means for forming an image having the complementary relation by driving said recording head in said scans on the basis of the image data having gradations reduced by said reducing means.

An image forming apparatus wherein an image for a predetermined region of a recording material is formed by a plurality of scans of a recording head, said apparatus comprising:

• allocating means for allocating multi-level image data for the predetermined region for the scans;
• gradation reducing means for reducing gradation of the multi-level image data allocated by said allocating means;
• and
• image forming means for forming an image having the complementary relation by driving said recording head in said scans on the basis of the image data having gradations reduced by said reducing means,
• wherein a correlation in the image by said forming means is removed by at least one of said allocating means and said gradation reducing means.

An image forming apparatus wherein an image for a predetermined region of a recording material is formed by a plurality of scans of a recording head, said apparatus comprising:

• allocating means for allocating multi-level image data for the predetermined region for the scans with different ratios;
• gradation reducing means for reducing gradation of the multi-level image data allocated by said allocating means through difference processes;
• and
• image forming means for forming an image having the complementary relation by driving said recording head in said scans on the basis of the image data having gradations reduced by said reducing means.