Converting digital values corresponding to colors of an image from a source color space to a destination color space

A color management module which converts digital values corresponding to colors of an image from a source color space to a destination color space, the source color space being represented by a source color space transformation associated with a source color profile, and the destination color space being represented by a destination color space transformation associated with a destination color profile, the color management module comprising:

• a first conversion module constructed to convert digital values corresponding to colors contained in the image from the source color space to digital values in a device-independent color space, using the source color space transformation;
• a determination module constructed to determine a gamut mapping from a source color gamut to a destination color gamut, by using a source gamut boundary description constructed from a source image profile which is separate from the source color profile, or by using a destination gamut boundary description constructed from a destination image profile which is separate from the destination color profile;
• a second conversion module constructed to convert the digital values in the device-independent color space to corresponding digital values in the device-independent color space using the gamut mapping, wherein the converted digital values represent gamut mapped digital values between the source gamut boundary description and the destination gamut boundary description;
• and
• a transformation module constructed to transform the gamut mapped digital values in the device-independent color space to corresponding digital values in the destination color space, using the destination color space transformation.

A color management apparatus comprising:

• a computer-readable memory constructed to store computer-executable process steps;
• and
• a processor constructed to execute the computer-executable process steps stored in the memory;
• wherein the process steps stored in the memory cause the processor to convert digital values corresponding to colors of an image from a source color space to a destination color space, the source color space being represented by a source color space transformation associated with a source color profile, and the destination color space being represented by a destination color space transformation associated with a destination color profile, and include computer-executable process steps to:
• convert digital values corresponding to colors contained in the image from the source color space to digital values in a device-independent color space, using the source color space transformation;
• determine a gamut mapping from a source color gamut to a destination color gamut, by using a source gamut boundary description constructed from a source image profile which is separate from the source color profile, or by using a destination gamut boundary description constructed from a destination image profile which is separate from the destination color profile;
• convert the digital values in the device-independent color space to corresponding digital values in the device-independent color space using the gamut mapping, wherein the converted digital values represent gamut mapped digital values between the source gamut boundary description and the destination gamut boundary description;
• and
• transform the gamut mapped digital values in the device-independent color space to corresponding digital values in the destination color space, using the destination color space transformation.

A computer-readable memory medium on which is stored computer-executable process steps for causing a computer to convert digital values corresponding to colors of an image from a source color space to a destination color space, the source color space being represented by a source color space transformation associated with a source color profile, and the destination color space being represented by a destination color space transformation associated with a destination color profile, the process steps comprising:

• converting digital values corresponding to colors contained in the image from the source color space to digital values in a device-independent color space, using the source color space transformation;
• determining a gamut mapping from a source color gamut to a destination color gamut, by using a source gamut boundary description constructed from a source image profile which is separate from the source color profile, or by using a destination gamut boundary description constructed from a destination image profile which is separate from the destination color profile;
• converting the digital values in the device-independent color space to corresponding digital values in the device-independent color space using the gamut mapping, wherein the converted digital values represent gamut mapped digital values between the source gamut boundary description and the destination gamut boundary description;
• and
• transforming the gamut mapped digital values in the device-independent color space to corresponding digital values in the destination color space, using the destination color space transformation.