Image processing apparatus, image processing method, and program for executing the image processing method

An image processing method comprising:

• allowing a printer to output chart data of a plurality of kinds of color mixture expressed by a three-dimensional color space constructed by cyan, magenta, and yellow (CMY);
• obtaining colorimetry values obtained from the output chart data;
• forming a reference value by converting patch data of the color mixture expressed by the three-dimensional color space into a device independent color space on the basis of a first color conversion table for converting the three-dimensional color space into the device independent color space;
• correcting a second color conversion table by using the obtained colorimetry values, the formed reference value, and the second color conversion table for converting the device independent color space into the three-dimensional color space;
• and
• forming a color conversion table for correcting a four-dimensional color space constructed by cyan, magenta, yellow, and black (CMYK) by using the first color conversion table and the second color conversion table.

An image processing apparatus comprising:

• an output control unit configured to allow a printer to output chart data of a plurality of kinds of color mixture expressed by a three-dimensional color space constructed by cyan, magenta, and yellow (CMY);
• a first obtaining unit configured to obtain colorimetry values which are obtained from the output chart data;
• a second obtaining unit configured to obtain a first color conversion table for converting a three-dimensional color space into a device independent color space;
• a third obtaining unit configured to obtain a reference value of the device independent color space which has previously been formed;
• a correction unit configured to correct the second color conversion table by using the obtained colorimetry values, the obtained reference value, and the second color conversion table for converting the device independent color space into the three-dimensional color space;
• and
• a forming unit configured to form a color conversion table for correcting a four-dimensional color space constructed by cyan, magenta, yellow, and black (CMYK) by using the first color conversion table and the second color conversion table.

An image processing method comprising:

• allowing a printer to output chart data of a plurality of kinds of color mixture expressed by a three-dimensional color space constructed by cyan, magenta, and yellow (CMY);
• obtaining colorimetry values which are obtained from the output chart data;
• obtaining a first color conversion table for converting a three-dimensional color space into a device independent color space;
• obtaining a reference value of the device independent color space which has previously been formed;
• correcting the second color conversion table by using the obtained colorimetry values, the obtained reference value, and the second color conversion table for converting the device independent color space into the three-dimensional color space;
• and
• forming a color conversion table for correcting a four-dimensional color space constructed by cyan, magenta, yellow, and black (CMYK) by using the first color conversion table and the second color conversion table.