Correction of the colorimetric value of colors measured under different observation conditions and generation of their profiles

A spectral distribution computing device for extracting a spectral distribution for correcting a result of color measurement under a first observation condition into a result of color measurement under a second observation condition, comprising:

• a first colorimetric value acquiring unit for acquiring a first colorimetric value obtained by measuring a color of a sample specimen for evaluation under the first observation condition,
• a second colorimetric value acquiring unit for acquiring a second calorimetric value obtained by measuring a color of the sample specimen for evaluation under the second observation condition, and
• a spectral distribution computing unit for computing a variable component of the spectral distribution depending on an observation condition as the component of the spectral distribution relating to the sample specimen for evaluation based on the first calorimetric value and the second calorimetric value.

A spectral distribution computing program recording medium for making a computer realize the function of extracting a spectral distribution for correcting a result of color measurement under the first observation condition into a result of color measurement under the second observation condition, allowing the realization of:

• a first calorimetric value acquiring function for acquiring a first calorimetric value obtained by measuring a color of a sample specimen for evaluation under the first observation condition,
• a second calorimetric value acquiring function for acquiring a second calorimetric value obtained by measuring a color of the sample specimen for evaluation under the second observation condition, and
• a spectral distribution computing function for computing a variable component of the spectral distribution depending on an observation condition as the component of the spectral distribution relating to the sample specimen for evaluation based on the first calorimetric value and the second colorimetric value.

A spectral distribution computing method for extracting a spectral distribution for correcting a result of color measurement under a first observation condition into a result of color measurement under a second observation condition, wherein

• the spectral distribution measured under the second observation condition is assumed to include the spectral distribution observed under the first observation condition and the spectral distribution in the prescribed functional form added to the spectral distribution observed under the first observation condition, and
• the spectral distribution in the prescribed functional form is computed based on the calorimetric value acquired under the first observation condition and the second observation condition.

A color measuring method for correcting a result of color measurement under a first observation condition into a result of color measurement under a second observation condition, comprising:

• measuring a color of an object of color measurement under the first observation condition, and
• recording in a specified recording medium, in advance, data for converting a calorimetric value acquired by color measurement into a calorimetric value acquired by measuring the color of the object of color measurement under the second observation condition, and converting the calorimetric value acquired by color measurement into the calorimetric value acquired by measuring the color of the object of color measurement under the second observation condition with reference to the recorded data.

A profile generating method for generating a profile for correlating image data and a calorimetric value of an output based on the image data, comprising:

• acquiring a calorimetric value of an output result based on the image data by measuring the color of the same under a first observation condition,
• converting the calorimetric value acquired into a calorimetric value resulting from the color measurement of the output result under a second observation condition, and
• generating the profile by correlating the converted colorimetric value and the image data.

A printing controlling method for executing printing by converting a color with reference to a color conversion profile wherein,

• a color conversion profile represents data generated by acquiring the calorimetric value obtained by measuring under a first observation condition a color of an output result based on an image data handled by a first image equipment, converting this calorimetric value into a calorimetric value acquired by measuring the color of the output result under a second observation condition, correlating the converted calorimetric value with the image data, and defining a correlation between the image data and a second image data based on this correlation and the correlation between the second image data handled by the second image equipment and the calorimetric value of its output.