Image processing apparatus, image processing method, and storage medium

Patent metadata

Field	Value
Publication number	US-12169744-B2
Application number	US-202418418128-A
Country	US
Kind code	B2
Filing date	Jan 19, 2024
Priority date	Feb 9, 2021
Publication date	Dec 17, 2024
Grant date	Dec 17, 2024

Abstract

An object of the present disclosure is to implement, at a low cost, highly accurate color calibration in a printing apparatus that performs printing using fluorescent ink. One embodiment of the present invention is an image processing apparatus that includes: a processing unit configured to perform processing relating to color calibration in a printing apparatus that prints an image on a printing medium using fluorescent printing material; and an execution unit configured to perform calibration processing of the printing apparatus based on a measured value that is obtained by measuring a patch chart for obtaining information on an amount of application of the fluorescent printing material in the printing apparatus, wherein a patch included in the patch chart is printed with the fluorescent printing material and subtractive color mixture printing material and at least one dot of the subtractive color mixture printing material covers a dot of the fluorescent printing material.

First claim

What is claimed is:

1. An image processing apparatus comprising:
a print control unit configured to control a printing unit to print a first patch image using fluorescent ink and subtractive mixed color ink whose reflectance in an activation wavelength of the fluorescent ink is higher than reflectance in a light-emitting wavelength of the fluorescent ink, and to print a second patch image using the subtractive mixed color ink; and
a processing unit configured to perform, based on a measurement value obtained by measuring the first patch image, calibration processing for the fluorescent ink, and to perform, based on a measurement value obtained by measuring the second patch image, calibration processing for the subtractive mixed color ink.

2. The image processing apparatus according to claim 1 , wherein
the calibration processing is processing to correct a density output by the printing unit with respect to an input color value.

3. The image processing apparatus according to claim 1 , wherein
the second patch image is printed using only the subtractive mixed color ink.

4. The image processing apparatus according to claim 1 , wherein
the fluorescent ink is fluorescent pink ink, fluorescent yellow ink, fluorescent blue ink, fluorescent green ink, fluorescent orange ink, or fluorescent red ink.

5. The image processing apparatus according to claim 1 , wherein
the subtractive mixed color ink is cyan ink, yellow ink, magenta ink, green ink, red ink, or orange ink.

6. The image processing apparatus according to claim 1 , wherein
the first patch image and the second patch image are printed on a same printing medium.

7. An image processing method that is performed by an image processing apparatus, the image processing method comprising:
controlling a printing unit to print a first patch image using fluorescent ink and subtractive mixed color ink whose reflectance in an activation wavelength of the fluorescent ink is higher than reflectance in a light-emitting wavelength of the fluorescent ink, and to print a second patch image using the subtractive mixed color ink;
performing, based on a measurement value obtained by measuring the first patch image, calibration processing for the fluorescent ink; and
performing, based on a measurement value obtained by measuring the second patch image, calibration processing for the subtractive mixed color ink.

8. The image processing method according to claim 7 , wherein
the calibration processing is processing to correct a density output by the printing unit with respect to an input color value.

9. The image processing method according to claim 7 , wherein
the second patch image is printed using only the subtractive mixed color ink.

10. The image processing method according to claim 7 , wherein
the fluorescent ink is fluorescent pink ink, fluorescent yellow ink, fluorescent blue ink, fluorescent green ink, fluorescent orange ink, or fluorescent red ink.

11. The image processing method according to claim 7 , wherein
the subtractive mixed color ink is cyan ink, yellow ink, magenta ink, green ink, red ink, or orange ink.

12. The image processing method according to claim 7 , wherein
the first patch image and the second patch image are printed on a same printing medium.

13. A non-transitory computer readable storage medium storing a program for causing a computer to perform an image processing method that is performed by an image processing apparatus, the image processing method comprising:
controlling a printing unit to print a first patch image using fluorescent ink and subtractive mixed color ink whose reflectance in an activation wavelength of the fluorescent ink is higher than reflectance in a light-emitting wavelength of the fluorescent ink, and to print a second patch image using the subtractive mixed color ink;
performing, based on a measurement value obtained by measuring the first patch image, calibration processing for the fluorescent ink; and
performing, based on a measurement value obtained by measuring the second patch image, calibration processing for the subtractive mixed color ink.

14. The non-transitory computer readable storage medium according to claim 13 , wherein
the calibration processing is processing to correct a density output by the printing unit with respect to an input color value.

15. The non-transitory computer readable storage medium according to claim 13 , wherein
the second patch image is printed using only the subtractive mixed color ink.

16. The non-transitory computer readable storage medium according to claim 13 , wherein
the fluorescent ink is fluorescent pink ink, fluorescent yellow ink, fluorescent blue ink, fluorescent green ink, fluorescent orange ink, or fluorescent red ink.

17. The non-transitory computer readable storage medium according to claim 13 , wherein
the subtractive mixed color ink is cyan ink, yellow ink, magenta ink, green ink, red ink, or orange ink.

18. The non-transitory computer readable storage medium according to claim 13 , wherein
the first patch image and the second patch image are printed on a same printing medium.

Assignees

• Canon Kk

Inventors

• Abe Seiji
• Baba Naoko
• Murasawa Kouta
• Yamaguchi Hiromitsu
• Kuriyama Keiji
• Igarashi Yuki
• Mori Hiroshi

Classifications

• B41J2/2114

  Ejecting specialized liquids, e.g. transparent or processing liquids (B41J2/211 takes precedence) · CPC title

• G06K15/1878

  Adjusting colours (image colour correction or control for documents in general H04N1/60) · CPC title

• C09D11/38

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• B41J29/393

  Devices for controlling or analysing the entire machine {; Controlling or analysing mechanical parameters involving printing of test patterns} · CPC title

• B41J2/2054

  by the variation of dot disposition or characteristics, e.g. dot number density, dot shape · CPC title