Image processing apparatus, image processing method, computer readable medium and data signal

An image processing system programmed on a non-transitory computer-readable medium comprising:

• a profile generating section that generates a color conversion profile on a basis of (i) first colorimetric values obtained from a first color chart, which includes a plurality of first color patches and is output from a target device, and (ii) second colorimetric values obtained from a second color chart, which includes a plurality of second color patches and is output from an output device other than the target device, the color conversion profile used for converting color data depending on the target device into color data depending on the output device;
• a designating section that allows a user to designate a color region including a plurality of colors and uses one of a mean of the colors, a median of the colors and a modal value of the colors as a designated color;
• a calculating section that calculates difference information between (i) a first data value obtained by converting the designated color into a device-independent color space and (ii) a second data value obtained by converting the designated color using the generated color conversion profile into a second color and then converting the second color into the device-independent color space;
• and
• a correcting section that corrects the first calorimetric values based on the calculated difference information, the correcting section that causes the profile generating section to generate the color conversion profile again based on the corrected first colorimetric values and the second colorimetric values, wherein:
• the designated color is a color to be subjected to correction of a color reproduction error between a color image output from the target device and a color image output from the output device, and
• the correcting section assigns different weights to respective components of the difference information calculated by the calculating section.

An image processing method programmed to be executable by a computer comprising:

• generating, by a profile generating section of the computer, a color conversion profile on a basis of (i) first calorimetric values obtained from a first color chart, which includes a plurality of first color patches and is output from a target device, and (ii) second calorimetric values obtained from a second color chart, which includes a plurality of second color patches and is output from an output device other than the target device, the color conversion profile used for converting color data depending on the target device into color data depending on the output device;
• allowing a user to designate, by a designating section of the computer, a color region including a plurality of colors and uses one of a mean of the colors, a median of the colors and a modal value of the colors as a designated color;
• calculating, by a calculating section of the computer, difference information between (i) a first data value obtained by converting the designated color into a device-independent color space and (ii) a second data value obtained by converting the designated color using the generated color conversion profile into a second color and then converting the second color using the device-independent color space;
• correcting, by a correcting section of the computer, the first calorimetric values based on the calculated difference information;
• and
• generating, by the correcting section of the computer, the color conversion profile again based on the corrected first calorimetric values and the second colorimetric values,
• wherein the correcting section assigns different weights to respective components of the difference information calculated by the calculating section.

A non-transitory computer readable medium storing a program causing a computer to execute image processing, the image processing comprising:

• generating a color conversion profile on a basis of (i) first calorimetric values obtained from a first color chart, which includes a plurality of first color patches and is output from a target device, and (ii) second colorimetric values obtained from a second color chart, which includes a plurality of second color patches and is output from an output device other than the target device, the color conversion profile used for converting color data depending on the target device into color data depending on the output device;
• allowing a user to designate, by a designating section of the computer, a color region including a plurality of colors and uses one of a mean of the colors, a median of the colors and a modal value of the colors as a designated color;
• calculating difference information between (i) a first data value obtained by converting the designated color into a device-independent color space and (ii) a second data value obtained by converting the designated color using the generated color conversion profile into a second color and then converting the second color using the device-independent color space;
• correcting the first colorimetric values based on the calculated difference information;
• and generating the color conversion profile again based on the corrected first calorimetric values and the second colorimetric values, and
• assigning different weights to respective components of the calculated difference information.