Creation of transform-based profiles by a measurement-based color management system

• US 7,715,070 B2
• Filed: 05/03/2005
• Issued: 05/11/2010
• Est. Priority Date: 05/03/2005
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.), Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.), Microsoft Corporation
• Inventors: Haikin, John S., Newman, Todd D.
• Primary Examiner(s): Zimmerman; Mark K
• Assistant Examiner(s): Tran; Dung D
• Application Number:
  US11/121,409
• Publication Number:
  US 20060250623A1
• Time in Patent Office: 1,834 Days
• Field of Search: 358/1.9, 358518-523, 382/162, 382/167
• US Class Current: 358/518
• CPC Class Codes: H04N 1/6058 Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut
• CPC Class Codes: H04N 1/6088 by viewing conditions, i.e. conditions at picture output

Abstract

A method and apparatus for generating transform-based color profiles by a measurement-based Color Management System (CMS). The measurement-based CMS generates the transform-based profile wherein the measurement-based color system is parameterized by color data and procedures. The CMS may use a reference Profile Connection Space (PCS) loaded from a measurement profile, thus enabling user configuration of the generation process. The reference PCS may also be set to include a gamut that is appropriate for an eventual color-output device. In addition, a Gamut Mapping Model (GMM) used in the generation process is user-selectable as well as a Device Model (DM). The DM may also be supplied as a pluggable module. The CMS also features user-selectable mapping from an International Color Consortium (ICC) intent to a PCS profile and to a DM. The features of the CMS may be used in an application, stand-alone profiling tool or in an operating system utility.

Claims

1. A color processing apparatus for generating a transform-based profile from a measurement-based device model profile, the color processing apparatus comprising:

a first initializing unit configured to initialize a device model, which transforms device color data, by using color measurement data for a color device of the measurement-based device model profile;

a first creating unit configured to create a device gamut boundary by using the device model;

a second creating unit configured to create a profile connection space gamut boundary;

a second initializing unit configured to initialize a gamut mapping model by using the device gamut boundary and the profile connection space gamut boundary; and

a generating unit configured to transform sampling data in a device color space by using the device model and the gamut mapping model and generate an AtoB look-up-table in the transform-based profile.

2. The color processing apparatus according to claim 1,

wherein the first creating unit comprises an appearance data generating unit configured to generate appearance data from device measurement data by using a color appearance model, and

wherein the device gamut boundary is created from the generated appearance data.

3. A color processing apparatus for generating a transform-based profile from a measurement-based device model profile, the color processing apparatus comprising:

a first initializing unit configured to initialize a device model, which transforms device color data, by using color measurement data for a color device of the measurement-based device model profile;

a first creating unit configured to create a device gamut boundary by using the device model;

a second creating unit configured to create a profile connection space gamut boundary;

a second initializing unit configured to initialize a gamut mapping model by using the device gamut boundary and the profile connection space gamut boundary; and

a generating unit configured to transform sampling data in a profile connection space by using the device model and the gamut mapping model and generating a B to A lookup table in the transform-based profile.

4. A method for a color processing apparatus for generating a transform-based profile from a measurement-based device model profile, the method comprising:

performing by a processor the following steps;

a first initializing step of initializing a device model, which transforms device color data, by using color measurement data for a color device of the measurement-based device model profile;

a first creating step of creating a device gamut boundary by using the device model;

a second creating step of creating a profile connection space gamut boundary;

a second initializing step of initializing a gamut mapping model by using the device gamut boundary and the profile connection space gamut boundary; and

a generating step of transforming sampling data in a device color space by using the device model and the gamut mapping model and generating an AtoB look-up-table in the transform-based profile.

5. The method according to claim 4,

wherein the first creating step comprises an appearance data generating step of generating appearance data from device measurement data by using a color appearance model, and

wherein the device gamut boundary is created from the generated appearance data.

6. A method for a color processing apparatus for generating a transform-based profile from a measurement-based device model profile, the method comprising:

performing by a processor the following steps;

a first initializing step of initializing a device model, which transforms device color data, by using color measurement data for a color device of the measurement-based device model profile;

a first creating step of creating a device gamut boundary by using the device model;

a second creating step of creating a profile connection space gamut boundary;

a second initializing step of initializing a gamut mapping model by using the device gamut boundary and the profile connection space gamut boundary; and

a generating step of transforming sampling data in a profile connection space by using the device model and the gamut mapping model and generating a BtoA lookup table in the transform-based profile.

7. A computer-readable medium storing a computer program for a color processing apparatus for generating a transform-based profile from a measurement-based device model profile, the program comprising:

a first initializing step of initializing a device model, which transforms device color data, by using color measurement data for a color device of the measurement-based device model profile;

a first creating step of creating a device gamut boundary by using the device model;

a second creating step of creating a profile connection space gamut boundary;

a second initializing step of initializing a gamut mapping model by using the device gamut boundary and the profile connection space gamut boundary; and

a generating step of transforming sampling data in a device color space by using the device model and the gamut mapping model and generating an AtoB look-up-table in the transform-based profile.

8. The program according to claim 7,

wherein the first creating step comprises an appearance data generating step of generating appearance data from device measurement data by using a color appearance model, and

wherein the device gamut boundary is created from the generated appearance data.

9. A computer-readable medium storing a computer program for a color processing apparatus for generating a transform-based profile from a measurement-based device model profile, the program comprising:

a first initializing step of initializing a device model, which transforms device color data, by using color measurement data for a color device of the measurement-based device model profile;

a first creating step of creating a device gamut boundary by using the device model;

a second creating step of creating a profile connection space gamut boundary;

a second initializing step of initializing a gamut mapping model by using the device gamut boundary and the profile connection space gamut boundary; and

a generating step of transforming sampling data in a profile connection space by using the device model and the gamut mapping model and generating a BtoA lookup table in the transform-based profile.