Image forming apparatus and control method thereof
AssigneeCanon Kabushiki Kaisha
InventorsHideki Kubo, Shugo Higuchi, Mizue Shimbaru
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Abstract
An image forming apparatus is provided that uses a table generated in advance to correct a gradation characteristic of an image to be formed when carrying out image forming using an image carrier. A patch is formed in an area where the image is not formed on the image carrier. A density of the patch formed on the image carrier is measured. The table is modified based on the density of the patch that has been measured. The patch is formed concurrently with image forming of the image on the image carrier.
Claims10
An image forming apparatus that uses a table generated in advance to correct a gradation characteristic of an image to be formed when carrying out image forming using an image carrier, comprising:
- a patch forming unit configured to form a patch in an area where the image is not formed on the image carrier;
- a measuring unit configured to measure a density of the patch formed on the image carrier;
- a modifying unit configured to modify the table based on the density of the patch measured by the measuring unit;
- and
- an analysis unit configured to analyze the image to be formed,
- wherein the patch forming unit controls colors targeted for patch forming in response to an analysis result of the analysis unit, and
- wherein the patch forming unit forms the patch concurrently with image forming of the image on the image carrier.
A control method of an image forming apparatus that carries out image forming using an image carrier, the method using a table generated in advance to correct a gradation characteristic of an image to be formed, and the method comprising:
- a patch forming step of forming a patch in an area where the image is not formed on the image carrier;
- a measuring step of measuring a density of the patch formed on the image carrier;
- and
- a modifying step of modifying the table based on the density of the patch measured in the measuring step;
- and
- an analyzing step of analyzing the image to be formed,
- wherein the patch forming step controls colors targeted for patch forming in response to an analysis result of the analyzing step, and
- wherein in the patch forming step, the patch is formed concurrently with image forming of the image on the image carrier.
Dependencies are inferred from the claim text.