Color image forming apparatus and color adjustment method
AssigneeCanon Kabushiki Kaisha
InventorsHiroshi Kita, Kiyoto Toyoizumi, Kenichi Iida
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Abstract
A color image forming apparatus specifies print mode (media), forms a test image based on gradation levels of a plurality of colors according to the specified print mode (media), and detects the test image with a color sensor. The color image forming apparatus performs gray axis correction calculation based on detection result obtained by the color sensor.
Claims7
A color image forming apparatus, comprising:
- a forming unit configured to form a plurality of mixed color patches that are different in a combination of gradation levels of a plurality of colors, the colors comprising yellow, magenta and cyan and to form a black patch;
- a detector configured to detect color of the plurality of mixed color patches and the black patch fixed on a transfer material by the forming unit;
- a calculator configured to obtain the gradation levels of yellow, magenta and cyan so that the color of each mixed color patch detected by the detector becomes similar to color of a corresponding black color of the black patch;
- and
- a specifying unit configured to specify an image forming condition related with a type of the transfer material or a type of print mode,
- wherein the forming unit forms the mixed color patches based on a first combination of gradation levels of yellow, magenta and cyan if the image forming condition specified is a first image forming condition, and the forming unit forms the mixed color patches based on a second combination of gradation levels of yellow, magenta and cyan different from the first combination of gradation levels of yellow, magenta and cyan if the image forming condition specified is a second image forming condition,
- wherein a color detection result of the mixed color patches formed by the first combination of gradation levels is able to encompass the corresponding black color on a color space, and a color detection result of the mixed color patches formed by the second combination of gradation levels is able to encompass the corresponding black color on a color space.
(canceled)
A color adjustment method for a color image forming apparatus comprising a forming unit configured to form a plurality of mixed color patches that are different in a combination of gradation levels of a plurality of colors, the colors comprising yellow, magenta and cyan and to form a black patch, a detector configured to detect color of the plurality of mixed color patches fixed on a transfer material by the forming unit, and a calculator configured to obtain the gradation levels of yellow, magenta and cyan so that the color of each mixed color patch detected by the detector becomes similar to color of a corresponding black color of the black patch, the method comprising:
- specifying an image forming condition related with a type of the transfer material or a type of print mode;
- causing the forming unit to form the mixed color patches based on a first combination of gradation levels of yellow, magenta and cyan if the specified image forming condition is a first image forming condition;
- and
- causing the forming unit to form the mixed color patches based on a second combination of gradation levels of yellow, magenta and cyan different from the first combination of gradation levels of yellow, magenta and cyan if the specified image forming condition is a second image forming condition,
- wherein a color detection result of the mixed color patches formed by the first combination of gradation levels is able to encompass the corresponding black color on a color space, and a color detection result of the mixed color patches formed by the second combination of gradation levels is able to encompass the corresponding black color on a color space.
Dependencies are inferred from the claim text.