Method of establishing conversion relationship for color prediction

Claim 1

A method of establishing a color-predicting conversion relationship, comprising the steps of: generating a first color chart having a plurality of patches under desired output conditions based on device data C, M, Y of a predetermined data pitch, and calorimetrically measuring said first color chart to produce first calorimetric data with respect to said device data C, M, Y; generating a second color chart having a plurality of patches under said desired output conditions based on device data C, M, Y, K which comprise part of said device data C, M, Y and device data K of a predetermined data pitch, and calorimetrically measuring said second color chart to produce second calorimetric data with respect to said device data C, M, Y, K; converting said first colorimetric data with respect to said part of the device data C, M, Y and said second colorimetric data with respect to said C, M, Y, K respectively into first linear spatial data and second linear spatial data which are linear with respect to a physical quantity based on a reflected luminance for thereby determining a linear spatial vector with respect to the same device data C, M, Y from said first linear spatial data to said second linear spatial data; determining a regression coefficient in a multiple regression equation capable of determining said linear spatial vector with respect to said device data C, M, Y, K from said part of the device data C, M, Y; determining a linear spatial vector with respect to arbitrary device data C, M, Y, K using said regression coefficient; converting said linear spatial vector with respect to said arbitrary device data C, M, Y, K into third calorimetric data; and establishing the relationship between said first, second, and third calorimetric data with respect to said arbitrary device data C, M, Y, K as a color-predicting conversion relationship.

Claim 2

A method of establishing a color-predicting conversion relationship, comprising the steps of: generating a first color chart having a plurality of patches under desired output conditions based on device data C, M, Y of a predetermined data pitch, and calorimetrically measuring said first color chart to produce first calorimetric data with respect to said device data C, M, Y; generating a second color chart having a plurality of patches under said desired output conditions based on device data C, M, Y, K which comprise part of said device data C, M, Y and device data K of a predetermined data pitch, and calorimetrically measuring said second color chart to produce second calorimetric data with respect to said device data C, M, Y, K; converting said first colorimetric data with respect to said part of the device data C, M, Y and said second colorimetric data with respect to said C, M, Y, K respectively into first linear spatial data and second linear spatial data which are linear with respect to a physical quantity based on a reflected luminance for thereby determining a linear spatial vector with respect to the same device data C, M, Y from said first linear spatial data to said second linear spatial data; determining a regression coefficient in a multiple regression equation capable of determining said linear spatial vector with respect to said device data C, M, Y, K from said part of the device data C, M, Y; determining a linear spatial vector with respect to arbitrary device data C, M, Y, K using said regression coefficient; converting said linear spatial vector with respect to said arbitrary device data C, M, Y, K into third calorimetric data; and establishing the relationship between said first, second, and third calorimetric data with respect to said arbitrary device data C, M, Y, K as a color-predicting conversion relationship.

Claim 8

A method of establishing a color-predicting conversion relationship, comprising the steps of: determining a reference color-predicting conversion relationship for converting device data into reference colorimetric data under reference output conditions; modifying a particular output condition among said reference output conditions to determine a node of the device data where colorimetric data vary characteristically; determining target calorimetric data from a color chart outputted based on the device data at said node under target output conditions in which said particular output condition is set to a desired output condition; determining target differences between said reference colorimetric data and said target colorimetric data; determining a corrective relationship for correcting said reference colorimetric data, from said target differences; and determining a target color-predicting conversion relationship for converting the device data into calorimetric data under the target output conditions, from said corrective relationship.

Claim 9

A method of establishing a color-predicting conversion relationship, comprising the steps of: determining a reference color-predicting conversion relationship for converting device data into reference colorimetric data under reference output conditions; modifying a particular output condition among said reference output conditions to determine a node of the device data where colorimetric data vary characteristically; determining target calorimetric data from a color chart outputted based on the device data at said node under target output conditions in which said particular output condition is set to a desired output condition; determining target differences between said reference colorimetric data and said target colorimetric data; determining a corrective relationship for correcting said reference colorimetric data, from said target differences; and determining a target color-predicting conversion relationship for converting the device data into calorimetric data under the target output conditions, from said corrective relationship.

Claim 17

A method of establishing a color-predicting conversion relationship, comprising the steps of: determining a reference color-predicting conversion relationship for converting device data into reference colorimetric data under reference output conditions; modifying a particular output condition among said reference output conditions to determine a node of the device data where colorimetric data vary characteristically; further modifying said particular output condition to determine a change in the colorimetric data at said node as a node function; determining target calorimetric data at said node from said node function under target output conditions in which said particular output condition is set to a desired output condition; determining target differences between said reference calorimetric data and said target calorimetric data; determining a corrective relationship for correcting said reference colorimetric data, from said target differences; and determining a target color-predicting conversion relationship for converting the device data into colorimetric data under the target output conditions, from said corrective relationship.

Claim 18

A method of establishing a color-predicting conversion relationship, comprising the steps of: determining a reference color-predicting conversion relationship for converting device data into reference colorimetric data under reference output conditions; modifying a particular output condition among said reference output conditions to determine a node of the device data where colorimetric data vary characteristically; further modifying said particular output condition to determine a change in the colorimetric data at said node as a node function; determining target calorimetric data at said node from said node function under target output conditions in which said particular output condition is set to a desired output condition; determining target differences between said reference calorimetric data and said target calorimetric data; determining a corrective relationship for correcting said reference colorimetric data, from said target differences; and determining a target color-predicting conversion relationship for converting the device data into colorimetric data under the target output conditions, from said corrective relationship.