# US 10,375,276 B2 · Color correction table creation method, color correction table creation apparatus, and non-transitory computer readable medium for storing program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,375,276 B2 - Document ID: US10375276B2 - Status: Granted - Kind: B2 - Application number: 16/085,047 - Filed: 2017-03-07 - Published: 2019-04-11 - Granted: 2019-08-06 - Earliest claimed: 2016-03-17 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Takashi Ito - Web page: https://patentgrep.com/patent/US10375276B2 ## CPC - H04N 1/60: Colour correction or control {(H04N1/54 takes precedence)} - B41J 2/525: Arrangement for multi-colour printing, not covered by group B41J2/21, e.g. applicable to two or more kinds of printing or marking process - G06T 1/00: General purpose image data processing - H04N 1/46: Colour picture communication systems - H04N 1/6008: {with primary colour signals, e.g. RGB or CMY(K)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract A color correction table creation method for creating a color correction table for correcting a device-dependent value used as printing data to be input to a printing apparatus, including an output value acquisition step of acquiring, as an output value, a colorimetric result for a printed matter created by inputting a specific device-dependent value to the printing apparatus, an input value acquisition step of acquiring, as an input value for the color correction, a device-dependent value for a printed matter created by a reference printing apparatus to achieve the output value acquired, a correction value acquisition step of acquiring the specific device-dependent value as a correction value corresponding to the input value, and a creation step of creating the color correction table utilizing a relationship between the input value and the correction value. ## Claims ### Claim 1 A color correction table creation method for creating a color correction table for correcting a device-dependent value used as printing data to be input to a printing apparatus, the color correction table creation method comprising: an output value acquisition step of acquiring, as an output value, a colorimetric result for a printed matter created by inputting a specific device-dependent value to the printing apparatus; an input value acquisition step of acquiring, as an input value for the color correction, a device-dependent value for a printed matter created by a reference printing apparatus to achieve the output value acquired; a correction value acquisition step of acquiring the specific device-dependent value as a correction value corresponding to the input value; a creation step of creating the color correction table utilizing a relationship between the input value and the correction value; and a supplementation step of supplementing the relationship between the input value and the correction value, wherein in the creation step, the correction value is determined by utilizing a result of the supplementation for at least some of a plurality of the input values to be stored in the color correction table, and in the supplementation step, a spline function is used. ### Claim 2 (depends on 1) The color correction table creation method according to claim 1, wherein the input value is determined to minimize a sum of squares of second differential parameters at lattice points of a cubic spline function used in the supplementation step. ### Claim 3 (depends on 1) The color correction table creation method according to claim 1, wherein the cubic spline function used in the supplementation step includes first to n-th spline functions, n being an integer of 2 or greater, respectively defined by first to n-th directions orthogonal to one another, and the input value is determined to minimize a value of a sum acquired by calculating and summing, for combinations for the first to n-th directions and for all the lattice points, a square of a difference between a second differential parameter at a certain lattice point of the spline function for an m-th, m being any one of integers of 1 to n, direction and a second differential spline parameter at an adjacent lattice point of another spline function for the m-th direction, the another spline function for the m-th direction passing through the adjacent lattice point that is adjacent to the certain lattice point in a direction orthogonal to the m-th direction. ### Claim 4 (depends on 1) The color correction table creation method according to claim 1, wherein the device-dependent value used as the printing data is defined to be n-dimensional, n being an integer of 2 or greater, and in the input value acquisition step, among candidates for the input value, a value with a shortest distance to the specific device-dependent value in the n-dimensional space is acquired as the input value. ### Claim 5 (depends on 1) The color correction table creation method according to claim 1, further comprising: a colorimetric apparatus correction step of correcting a deviation between a characteristic of the reference colorimetric apparatus and a characteristic of a colorimetric apparatus used for colorimetric processing on the printed matter in the input value acquisition step, wherein in the input value acquisition step, the input value is acquired using a correspondence relationship between the device-dependent value and the output value acquired in the colorimetric apparatus correction step. ### Claim 6 A color correction table creation apparatus for creating a color correction table for correcting a device-dependent value used as printing data to be input to a printing apparatus, wherein the color correction table creation apparatus is configured to execute, an output value acquisition step of acquiring, as an output value, a colorimetric result for a printed matter created by inputting a specific device-dependent value to the printing apparatus; an input value acquisition step of acquiring, as an input value for the color correction, a device-dependent value for a printed matter created by a reference printing apparatus to achieve the output value acquired; a correction value acquisition step of acquiring the specific device-dependent value as a correction value corresponding to the input value; a creation step of creating the color correction table utilizing a relationship between the input value and the correction value; and a supplementation step of supplementing the relationship between the input value and the correction value, wherein in the creation step, the correction value is determined by utilizing a result of the supplementation for at least some of a plurality of the input values to be stored in the color correction table, and in the supplementation step, a spline function is used. ### Claim 7 A non-transitory computer readable medium for storing program for creating a color correction table for correcting a device-dependent value used as printing data to be input to a printing apparatus, wherein the program causes a computer to execute, an output value acquisition step of acquiring, as an output value, a colorimetric result for a printed matter created by inputting a specific device-dependent value to the printing apparatus; an input value acquisition step of acquiring, as an input value for the color correction, a device-dependent value for a printed matter created by a reference printing apparatus to achieve the output value acquired; a correction value acquisition step of acquiring the specific device-dependent value as a correction value corresponding to the input value; a creation step of creating the color correction table utilizing a relationship between the input value and the correction value; and a supplementation step of supplementing the relationship between the input value and the correction value, wherein in the creation step, the correction value is determined by utilizing a result of the supplementation for at least some of a plurality of the input values to be stored in the color correction table, and in the supplementation step, a spline function is used.