Color processing apparatus, image forming apparatus, and non-transitory computer readable recording medium performing color conversion, adjustment and matching process between input color data and reproducible color data of image output device

Patent metadata

Field	Value
Publication number	US-9332158-B2
Application number	US-201414470126-A
Country	US
Kind code	B2
Filing date	Aug 27, 2014
Priority date	Feb 20, 2014
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

Provided is a color processing apparatus including an associated information obtaining section that obtains first associated information in which first color information in a first color space is associated with first output color information that is a target to be output in a second color space, and second associated information in which the first color information is associated with second output color information in the second color space of an image output, an output section that outputs second color information in the first color space to the color adjustment target unit, an output color information obtaining section that obtains third output color information in the second color space output by the color adjustment target unit, and a conversion relation creating section that creates the conversion relation.

First claim

What is claimed is:

1. A color processing apparatus comprising:
an associated information obtaining section that obtains first associated information in which color information in a device-dependent color space is associated with first output color information that is a target to be output in a device-independnet color space when the color information is input to a color adjustment target unit where color adjustment of an image is performed, and second associated information in which color information in the device-dependent color space is associated with second output color information in the device-independent color space of an image output when the color information in the device-dependent color space is input to the color adjustment target unit;
an output section that outputs second color information in the first device-dependent color space, obtained by converting the color information used in the second associated information using a conversion relation where the color adjustment of the color adjustment target unit is performed, to the color adjustment target unit;
an output color information obtaining section that obtains third output color information in the device-independent color space output by the color adjustment target unit when the second color information is input to the color adjustment target unit; and
a conversion relation creating section that creates the conversion relation based on the third output color information, fourth output color information in the device-independent color space in which the second output color information is associated with the second output color information, and the second color information,
wherein in the device-dependent color space, it is determined whether the second color information obtained is sparse or dense and, as a result of the determination, in) a place where the third output color information or the fourth output color information is dense, thinning a difference is performed, and in a place where the third output color information or the fourth output color information is sparse, an amount is added so that an expansion result is not diverged in an expansion process.

2. The apparatus according to claim 1 , wherein
the conversion relation creating section creates the conversion relation without changing at least part of the first color information for a color guarantee.

3. The apparatus according to claim 1 , further comprising:
a predicting section that predicts the fourth output color information from the second output color information based on the second associated information.

4. The apparatus according to claim 2 , further comprising:
a predicting section that predicts the fourth output color information from the second output color information based on the second associated information.

5. The apparatus according to claim 3 , wherein
the predicting section creates the second associated information that is newly applied from the third output color information, the fourth output color information, and the second color information.

6. The apparatus according to claim 4 , wherein
the predicting section creates the second associated information that is newly applied from the third output color information, the fourth output color information, and the second color information.

7. The apparatus according to claim 3 , wherein
the predicting section creates the second associated information that is newly applied based on a difference between the third output color information and the fourth output color information.

8. The apparatus according to claim 4 , wherein
the predicting section creates the second associated information that is newly applied based on a difference between the third output color information and the fourth output color information.

9. The apparatus according to claim 5 , wherein
the predicting section creates the second associated information that is newly applied based on a difference between the third output color information and the fourth output color information.

10. The apparatus according to claim 6 , wherein
the predicting section creates the second associated information that is newly applied based on a difference between the third output color information and the fourth output color information.

11. The color processing apparatus according to claim 1 , wherein
the first color space corresponds to a YMCK color space, and the second color space corresponds to an L*a*b* color space.

12. An image forming apparatus comprising:
an image forming unit that forms an image on a recording material using a plurality of coloring materials; and
a color adjusting section that performs color adjustment of the image formed by the image forming unit and creates a conversion relation used for performing the color adjustment, wherein
the color adjusting section includes:
an associated information obtaining section that obtains first associated information in which color information in a device-dependent color space is associated with first output color information that is a target to be output in a device-independent color space when the color information is input to the image forming unit where color adjustment of an image is performed, and second associated information in which color information in the device-dependent color space is associated with second output color information in the device-independent color space of an image output when the color information in the device-dependent color space is input to the image forming unit;
an output section that outputs second color information in the device -dependent color space, obtained by converting the color information used in the second associated information using the conversion relation, to the image forming unit;
an output color information obtaining section that obtains third output color information in the device-independent color space output by the image forming unit when the second color information is input to the image forming unit; and
a conversion relation creating section that creates the conversion relation based on the third output color information, fourth output color information in the device-independent color space in which the second output color information is associated with the second color information, and the second color information,
wherein in the device-dependent color space, it is determined whether the second color information obtained is sparse or dense, and, as a result of the determination in a place where the third output color information or the fourth output color information is dense, thinning a difference is performed, and in a place where the third output color information or the fourth output color information is sparse, an amount is added so that an expansion result is not diverged in an expansion process.

13. The image forming apparatus according to claim 12 , wherein
the first color space corresponds to a YMCK color space, and the second color space corresponds to an L*a*b* color space.

14. A non-transitory computer readable recording medium that stores a program that causes a computer to execute functions comprising:
a function of obtaining first associated information in which color information in a device-dependent color space is associated with first output color information that is a target to be output in a device-independent color space when the color information is input to a color adjustment target unit where color adjustment of an image is performed, and second associated information in which color information in the device-dependent color space is associated with second output color information in the device-independent color space

Assignees

• Fuji Xerox Co Ltd

Inventors

• Mori Kenji
• Sugi Shinsuke

Classifications

• H04N1/6033 Primary

  using test pattern analysis (H04N1/6055 takes precedence) · CPC title