Image processing apparatus, image processing method, and computer program product
AssigneeRicoh Company, Ltd.
InventorTakeshi Shibuya
Life of this patent
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Abstract
An image forming apparatus outputs a proof chart in response to an instruction for calibration execution from a user and then a color measuring unit measures the colors of patches on the proof chart. A profile management unit selects, from entries in a base profile DB, a base profile in an entry that has color reproduction characteristics that are closest to the color measurement values of the patches and generates a sheet correction TRC that has an approximation to the color measurement values of the patches when the selected base profile is used. The selected base profile is used as a color conversion parameter in a color management module, and the generated sheet correction TRC is used as a tone correction parameter in a sheet-corresponding correcting unit.
Claims8
An image processing apparatus that performs image processing to achieve uniform color reproduction on various types of image formation media by an image forming apparatus, wherein the image forming apparatus forms a color image on an image formation medium by superimposing a plurality of basic colors,
- the image processing apparatus comprising:
- a database that stores therein a plurality of color conversion parameters;
- a color converting unit that converts, by using a color conversion parameter that is selected from the plurality of color conversion parameters stored in the database, either device-dependent color values of another device different from the image forming apparatus or device-independent color values into color values that correspond to basic colors of the image forming apparatus;
- a medium-corresponding correcting unit that corrects, by using a tone correction parameter, tone characteristics of the respective basic colors of the image forming apparatus to correspond with an image formation medium to be used by the image forming apparatus;
- and
- a user interface that receives a user's operation that instructs a calibration to start, wherein
- through the calibration started according to the user's operation by using the user interface, the color conversion parameter to be used by the color converting unit is automatically selected from the plurality of color conversion parameters stored in the database, and the tone correction parameter to be used by the medium-corresponding correcting unit is generated.
A method of image processing performed to achieve uniform color reproduction on various types of image formation media by an image forming apparatus, wherein the image forming apparatus forms a color image on an image formation medium by superimposing a plurality of basic colors, the method comprising:
- causing the image forming apparatus to output a proof chart that is made up of a plurality of patches formed on an image formation medium;
- measuring colors of the patches on the proof chart output from the image forming apparatus;
- selecting, from a plurality of color conversion parameters pre-stored in a database, a color conversion parameter that has color reproduction characteristics closest to color measurement values of the measured patches;
- generating a tone correction parameter that has an approximation to the color measurement values of the patches when the selected color conversion parameter is used;
- converting, by using the selected color conversion parameter, either device-dependent color values of another device different from the image forming apparatus or device-independent color values into color values that correspond to basic colors of the image forming apparatus;
- and
- correcting, by using the generated tone correction parameter, tone characteristics of the respective basic colors of the image forming apparatus to correspond with an image formation medium to be used by the image forming apparatus.
A computer program product comprising a non-transitory computer-readable medium having computer-readable program codes embodied in the medium for image processing performed to achieve uniform color reproduction on various types of image formation media by an image forming apparatus, wherein the image forming apparatus forms a color image on an image formation medium by superimposing a plurality of basic colors, the program codes when executed causing a computer to execute:
- causing the image forming apparatus to output a proof chart that is made up of a plurality of patches formed on an image formation medium;
- measuring colors of the patches on the proof chart output from the image forming apparatus;
- selecting, from a plurality of color conversion parameters pre-stored in a database, a color conversion parameter that has color reproduction characteristics closest to color measurement characteristic values of the measured patches;
- generating a tone correction parameter that has an approximation to the color measurement values of the patches when the selected color conversion parameter is used;
- converting, by using the selected color conversion parameter, either device-dependent color values of another device different from the image forming apparatus or device-independent color values into color values that correspond to basic colors of the image forming apparatus;
- and
- correcting, by using the generated tone correction parameter, tone characteristics of the respective basic colors of the image forming apparatus to correspond with an image formation medium to be used by the image forming apparatus.
Dependencies are inferred from the claim text.