COLOR PROCESSING APPARATUS AND METHOD THEREOF

• US 20130307864A1
• Filed: 04/04/2013
• Published: 11/21/2013
• Est. Priority Date: 05/15/2012
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Matsuura, Takahiro
• Granted Patent: US 9,019,294 B2
• Time in Patent Office: Days
• US Class Current: 345/590
• CPC Class Codes: G06T 11/001 Texturing; Colouring; Generation of texture or colour inpainting G06T5/77
• CPC Class Codes: H04N 1/6011 with simulation on a subsidiary picture reproducer H04N1/622 takes precedence; matching two or more picture reproducers H04N1/6052
• CPC Class Codes: H04N 1/6055 using test pattern analysis

Abstract

A first table, which expresses a color reproducible characteristic of a first output device, is generated, and a second table, which expresses a color reproducible characteristic of a second output device, is generated. Color values of grid points of the first table are mapped to a color gamut of the second output device expressed by the second table. A third table, which expresses a relationship between color values of the first table after mapping processing and device values required to reproduce colors of the color values by the second output device, is generated. With reference to the third table, a profile, which expresses a relationship between color values of grid points arranged on a uniform color space, and device values required to reproduce colors of the color values by the second output device, is generated.

Claims

1. A color processing apparatus for generating a profile required to reproduce an image reproduced by a first output device using a second output device, the apparatus comprising:

a first generation unit configured to generate a first table which expresses a color reproducible characteristic of the first output device and a second table which expresses a color reproducible characteristic of the second output device;

a mapping unit configured to execute first mapping processing so as to map color values of grid points of the first table to a color gamut of the second output device expressed by the second table;

a second generation unit configured to generate a third table which expresses a relationship between color values of the first table after the first mapping processing and device values required to reproduce colors of the color values by the second output device; and

a third generation unit configured to generate the profile which expresses a relationship between color values of grid points arranged on a uniform color space and the device values required to reproduce colors of the color values by the second output device with reference to the third table.

2. The apparatus according to claim 1, wherein the first generation unit generates the first table from a relationship between measurement results of colors reproduced by the first output device based on data corresponding to a plurality of grid points arranged on a predetermined color space, and the plurality of grid points, and generates the second table from a relationship between measurement results of colors reproduced by the second output device based on the data, and the plurality of grid points.

3. The apparatus according to claim 1, wherein the mapping unit determines whether or not measurement values included in the first table are included in the color gamut of the second output device, and performs the first mapping processing to map color values of grid points of the first table, which correspond to measurement values that are not included in the color gamut of the second output device, to the color gamut of the second output device.

4. The apparatus according to claim 1, wherein the third generation unit generates the profile which expresses a relationship between color values obtained by mapping the color values of the grid points arranged on the uniform color space on a mapped gamut expressed by the first table after the first mapping processing, and device values required to reproduce colors of the color values by the second output device.

5. The apparatus according to claim 4, wherein the third generation unit determines whether or not the color values of the grid points on the uniform color space are included in the mapped gamut, and performs second mapping process to map color values of grid points on the uniform color space, which correspond to color values that are not included in the mapped gamut, to the mapped gamut.

6. The apparatus according to claim 1, further comprising an input unit configured to input the measurement results from a measuring device.

7. The apparatus according to claim 6, wherein the input unit converts measurement values input from a contact measuring device into measurement values of a non-contact measuring device.

8. The apparatus according to claim 1, further comprising a supply unit configured to supply the data to the first output device and the second output device.

9. The apparatus according to claim 1, wherein the first output device is a printer, and the second output device is a monitor.

10. The apparatus according to claim 1, wherein the first output device is a monitor, and the second output device is a printer.

11. The apparatus according to claim 1, wherein the first output device and the second output device are monitors.

12. A color processing method of generating a profile required to reproduce an image reproduced by a first output device using a second output device, the method comprising the steps of:

generating a first table which expresses a color reproducible characteristic of the first output device and a second table which expresses a color reproducible characteristic of the second output device;

executing first mapping processing so as to map color values of grid points of the first table to a color gamut of the second output device expressed by the second table;

generating a third table which expresses a relationship between color values of the first table after the first mapping processing and device values required to reproduce colors of the color values by the second output device; and

generating the profile which expresses a relationship between color values of grid points arranged on a uniform color space and the device values required to reproduce colors of the color values by the second output device with reference to the third table.

13. A non-transitory computer readable medium storing a computer-executable program for causing a computer to perform the color processing method according to claim 12.