Back to results
US 7,804,630 B2Granted
Image processing apparatus and image processing method
AssigneeCanon Kabushiki Kaisha
InventorNaoyuki Nishikawa
Life of this patent
Estimating the term…
Abstract
An object of an input print job is discriminated, and color conversion processing is applied to the object of the print job based on the discrimination result and information which is set in correspondence with the print job and is used to designate color conversion processing. When the object is a transparent object, the color conversion processing is executed on a rendering color space, and when the object is a gradation object, the color conversion processing is executed on a device color space.
Claims13
An image processing apparatus comprising:
- discrimination means for discriminating an object of an input print job;
- and
- color conversion processing means for performing color conversion processing to the object based on a discriminating result of said discrimination means and information which designates color conversion processing set for each print job,
- wherein, when the object is a transparent object, said color conversion processing means executes the color conversion processing on a rendering color space, and when the object is a gradation object, said color conversion processing means executes the color conversion processing on a device color space, and
- wherein, when the object is the gradation object, the object is divided into a plurality of objects, color matching processing is applied to end points of the divided objects, and intermediate pixels are formed on the device color space, and
- wherein, when the object is the gradation object, a parameter used to designate the gradation object is input,
- a data group of the gradation object is formed by color matching processing based on the parameter and a trend changing of color values of the data group is inspected, and
- intermediate pixel values are calculated by an interpolation calculation from the data group, and when the intermediate pixel values do not monotonically increase or decrease according to the trend changing, the intermediate pixel values are corrected to monotonically increase or decrease.
5 more elements
An image processing method of an image processing apparatus comprising:
- a discrimination step of discriminating an object of an input print job;
- and
- a color conversion processing step of applying color conversion processing to the object based on a result in the discrimination step and information which designates color conversion processing set for each print job,
- wherein the color conversion processing step includes a step of executing, when the object is a transparent object, the color conversion processing on a rendering color space, and executing, when the object is a gradation object, the color conversion processing on a device color space, and
- wherein, when the object is the gradation object, the object is divided into a plurality of objects, color matching processing is applied to end points of the divided objects, and intermediate pixels are formed on the device color space, and
- wherein, when the object is the gradation object, a parameter used to designate the gradation object is input,
- a data group of the gradation object is formed by color matching processing based on the parameter and a trend changing of color values of the data group is inspected, and
- intermediate pixel values are calculated by an interpolation calculation from the data group, and when the intermediate pixel values do not monotonically increase or decrease according to the trend changing, the intermediate pixel values are corrected to monotonically increase or decrease.
5 more elements
An image processing method comprising:
- a step of performing color matching processing to a data group corresponding to a gradation object;
- a step of detecting a trend changing of color to the data group based on a result of the color matching processing to obtain an intermediate pixel by an interpolation calculation from the data group;
- and
- a step of correcting a value of the intermediate pixel when a value of the intermediate pixel does not monotonically increase or decrease according to the trend changing.
1 more element
An image processing apparatus comprising:
- means for performing color matching processing to a data group corresponding to a gradation object;
- means for detecting a trend changing of color to the data group based on a result of the color matching processing, and for obtaining an intermediate pixel by an interpolation calculation from the data group;
- and
- means for correcting a value of the intermediate pixel when a value of the intermediate pixel does not monotonically increase or decrease according to the trend changing.
1 more element
Dependencies are inferred from the claim text.