Color management system using measured device data

• US 7,619,773 B2
• Filed: 08/14/2006
• Issued: 11/17/2009
• Est. Priority Date: 03/31/2000
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Haikin, John S., Newman, Todd D.
• Primary Examiner(s): Haskins; Twyler L
• Assistant Examiner(s): BURLESON, MICHAEL L
• Application Number:
  US11/503,070
• Publication Number:
  US 20060274342A1
• Time in Patent Office: 1,191 Days
• Field of Search: 358/1.9, 358/518, 382/167, 382/162
• US Class Current: 358/1.9
• CPC Class Codes: H04N 1/603 controlled by characteristics of the picture signal generator or the picture reproducer

Abstract

Managing color data to transform source color image data from a source device into destination color image data for rendering by a destination device, including accessing a source color data file corresponding to the source device, the source color data file containing source device color characteristic data, constructing a source color transform based on the source device color characteristic data contained in the source color data file, and applying the source color transform to the source color image data to transform the source color image data from a source device color space into interim color image data in an interim color space.

Claims

1. A method for transforming source color image data depending on a source device into destination color image data depending on a destination device, comprising the steps of:

accessing a source color data file of the source device and a destination color data file of the destination device, the source and the destination color data file containing colorimetric data and corresponding device data;

constructing a source color transform based on the source color data file by using a source color transform constructing function;

constructing a destination color transform based on the destination color data file by using a destination color transform constructing function;

generating a source gamut boundary of the source device and a destination gamut boundary of the destination device;

constructing a gamut transform based on the source gamut boundary of the source device and the destination gamut boundary of the destination device;

incorporating the source color transform, the gamut transform and the destination color transform to generate an incorporated transform;

transforming the source color image data into the destination color image data by using the incorporated transform;

saving the source color transform for future use; and

saving the incorporated transform for future use.

2. A method according to claim 1, wherein the source color data file includes viewing condition data and is transformed based on the viewing condition data by using a color appearance model.

3. A method according to claim 2, further comprising the step of:

selecting the color appearance model which a user desires.

4. A method according to claim 1, further comprising the step of:

saving the source gamut boundary.

5. A transforming apparatus for transforming source color image data depending on a source device into destination color image data depending on a destination device, comprising:

an accessor which accesses a source color data file of the source device and a destination color data file of the destination device, the source and the destination color data file containing colorimetric data and corresponding device data;

a source color transform constructor which constructs a source color transform based on the source color data file by using a source color transform constructing function;

a destination color transform constructor which constructs a destination color transform based on the destination color data file by using a destination color transform constructing function;

a generator which generates a source gamut boundary of the source device and a destination gamut boundary of the destination device;

a gamut transform constructor which incorporates a gamut transform based on the source gamut boundary of the source device and the destination gamut boundary of the destination device;

an incorporator which incorporates the source color transform, the gamut transform and the destination color transform to generate an incorporated transform;

a source color image data transformer which transforms the source color image data into the destination color image data by using the incorporated transform;

memory which saves the source color transform for future use; and

memory which saves the incorporated transform for future use.

6. An apparatus according to claim 5, wherein the source color data file includes viewing condition data and is transformed based on the viewing condition data by using a color appearance model.

7. An apparatus according to claim 6, further comprising a selector which selects the color appearance model which a user desires.

8. An apparatus according to claim 5, further comprising memory for saving the source gamut boundary.

9. A computer-readable memory medium having computer-executable process steps stored thereon, wherein said process steps comprise:

an accessing step to access a source color data file of a source device and a destination color data file of a destination device, the source and the destination color data file containing colorimetric data and corresponding device data;

a constructing step to construct a source color transform based on the source color data file by using a source color transform constructing function;

a constructing step to construct a destination color transform based on the destination color data file by using a destination color transform constructing function;

a generating step to generate a source gamut boundary of the source device and a destination gamut boundary of the destination device;

a constructing step to construct a gamut transform based on the source gamut boundary of the source device and the destination gamut boundary of the destination device;

an incorporating step to incorporate the source color transform, the gamut transform and the destination color transform to generate an incorporated transform;

a transforming step to transform the source color image data into the destination color image data by using the incorporated transform;

a saving step to save the source color transform for future use; and

a saving step to save the incorporated transform for future use.

10. A computer-readable memory medium according to claim 9, wherein the source color data file includes viewing condition data and is transformed based on the viewing condition data by using a color appearance model.

11. A computer-readable memory medium according to claim 10, wherein said process steps further comprise a selecting step to select the color appearance model which a user desires.

12. A computer-readable memory medium according to claim 9, wherein said process steps further comprise a saving step to save the source gamut boundary.