CN107395919A - A kind of method for realizing digital printing color correction by changing characteristic file - Google Patents
A kind of method for realizing digital printing color correction by changing characteristic file Download PDFInfo
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- CN107395919A CN107395919A CN201710546392.5A CN201710546392A CN107395919A CN 107395919 A CN107395919 A CN 107395919A CN 201710546392 A CN201710546392 A CN 201710546392A CN 107395919 A CN107395919 A CN 107395919A
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- color
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6075—Corrections to the hue
Abstract
The invention discloses a kind of method for realizing digital printing color correction by changing characteristic file.The method of the present invention is the source characteristic file according to digital document to be printed, prints the corresponding L for characterizing color chart picture, measuring each color lump*a*b*Value, for the target L of each color lump*a*b*Value, the L with the less part color lump of target color lump aberration is found out from printing color lump*a*b*Value, then find out the L that color lump is corresponded in the characteristic file of source*a*b*Value, mapping relations are established using the method for multinomial least square regression, then with target L*a*b*It is worth for independent variable, the correction value that color lump is corresponded in the characteristic file of source is calculated, recycles revised characteristic file to substitute initial source characteristic file, be assigned to digital document to be printed and printed.The present invention realizes a kind of high-precision, easily digital printing color calibration method.
Description
Technical field
The present invention relates to printing process Quality Control Technology field, more particularly to the color correction side of digital printing
Method.
Background technology
Digital printing refers to reads digital document using computer, under conditions of it need not make printing plate, is done directly figure
The duplication of picture, mode common at present have xerography and ink-jet etc..Digital printer reads the source of RGB patterns or CMYK patterns
, it is necessary to which operating personnel specify a kind of characteristic file for the colouring information in source file during file.Operating personnel can select source document
The characteristic file of part insertion is source characteristic file, can also specify the source characteristic file that other characteristic files are source file.Numeral
Printing machine is converted to device-dependent colouring information in source file and device-independent face according to the source characteristic file specified
Color information, further according to the device characteristics file of digital printer, the colouring information of digital printer is converted to, is then printed out
Hard copy.
According to the different needs, the color of original copy may be simulated by exporting the color of object of hard copy, it is also possible to which simulation passes
The color of system press printing.However, due to the performance change of digital printer, source digital document or simulation conventional presses
The reason such as targeted colorspace and output equipment color space colour gamut difference, target face may be deviateed by actually printing obtained color
Color is beyond the scope allowed.The control software of some digital printers can provide correction interface, and operating personnel are according to current printing
Effect and target call, the methods of by adjusting tone curve, make printing effect as far as possible close to target call；Some digital printings
Machine control software does not have calibration function, then needs operator in professional color management software, such as ProfileEditer softwares
In source characteristic file or digital printer characteristic file are entered edlin adjustment.But this two kinds correct the subjectivity for being all based on human eye
Experience the adjustment carried out, poor accuracy, the experience and technical requirements to operating personnel are high, and effect is unstable.
The content of the invention
The technical problems to be solved by the invention are：A kind of subjective feeling independent of operating personnel is proposed, can be whole
Digital printing color is set to approach the color calibration method of target call in the color gamut space of individual digital printer.
In order to solve the above technical problems, the method for the present invention is digital printer and digital document and its source for specifying
Characteristic file, first print and color chart picture is characterized corresponding to the characteristic file of source, according to the actual printing for characterizing color chart picture
The chromatic value of chromatic value and source characteristic file, mapping relations are established in local color gamut space, then using aim colour angle value as independent variable,
The correction value of source characteristic file chromatic value is obtained according to mapping relations, then numeral to be printed is used as using revised characteristic file
The source characteristic file of file is printed, and realizes the correction of print color.Specifically include following steps：
Step (1) is directed to the digital printer specified, and the characteristic file A according to specified by digital document to be printed, obtains
Color chart picture is characterized corresponding to taking and characterization data file, characterization data file record the L of each color lump*a*b*Value,
It is designated as respectively in orderIt is characterization color in specified characteristic file A
Under conditions of the source characteristic file of logo image, print characteristic color chart picture, the L of each color lump is measured*a*b*Value, divides in order
It is not designated as And the target L of each color lump*a*b*Value,
It is designated as in order Wherein L*a*b*What Zhi Zhi International Commission on Illumination was recommended
CIE 1976L*a*b*The color coordinate values in space, n are the color lump number for characterizing color chart picture；
Step (2) calculates respectively for the 1st color lump of characterization color chart pictureWith WithWithBetween value of chromatism, according to the small preferential principle of aberration,
The measured value of 30 color lumps is taken out from whole color lumps, is designated as
Again fromFind out the L of 30 color lumps of correspondence position*a*b*Value, is designated as
WithFor independent variable, with For dependent variable, mapping is established using the method for multinomial least square regression
Relation M；
To characterize the target of the 1st of color chart picture the color lumpFor independent variable, using mapping relations M, calculate
To the correction value of the 1st color lump of characteristic file, it is designated as
Other color lumps for characterizing color chart picture, respectively basisValue, using same
Method, the 2nd color lump of characteristic file is calculated to the correction value of n-th of color lump, is designated as
Step (3) withValue, the characteristic described in replacement step (1)
Change described in data fileValue, recycles amended characterization
Data file makes the characterization file B of amendment.Utilization level data file makes characteristic file using ripe technology；
(4) under conditions of specified characteristic file B is to characterize the source characteristic file of color chart picture, print characteristic again
Color chart picture, measure the L of each color lump*a*b*Value, is designated as respectively in order
Calculate respectivelyWith WithWithBetween value of chromatism, then average color difference and maximum aberration are calculated, if average color difference and maximum aberration are less than setting
Desired value, perform step (6), although or average color difference or maximum aberration be unsatisfactory for the desired value of setting, operating personnel
Abandon correcting, also perform step (6), otherwise perform step (5).Aberration is calculated using ripe technology；
Step (5) withFor the chromatic value of source characteristic file, withFor print result chromatic value, aim colour angle value
It is constant, using the same method of step (2) and (3), characteristic file is corrected again, and until meeting to require, or operating personnel stop
Only amendment directly performs step (6)；
Revised characterization file is appointed as number to be printed by step (6) using the digital printer described in step (1)
The source file of word file, complete printing.
Preferably, the color mode of digital document to be printed includes RGB patterns and CMYK patterns, corresponding specified
Characteristic file is RGB-L*a*b*Characteristic file and CMYK-L*a*b*Characteristic file.
Preferably, withFor independent variable,
WithFor dependent variable, multinomial least square regression is utilized
Method when establishing mapping relations M, using 11 multinomials.
Preferably, the target L of color chart picture is characterized*a*b*Value is specified as needed by operating personnel, can be traditional print
The L that brush machine printing characteristic color chart picture obtains*a*b*Source characteristic file specified by value or digital document to be printed
L*a*b*Value or other desired values.
Beneficial effects of the present invention：The color correction of the present invention is realized based on objective detection data, compared to base
In the correction of subjective feeling progress, color correction precision is high, breaks away from the dependence to experience；The present invention is according to neighbouring part
Source characteristic file chromatic value and actual printing effect chromatic value in color gamut space, are included each to source characteristic file one by one
Kind color is corrected, high compared to correction of overall importance, color correction precision；The present invention is realized by correcting source characteristic file
Color correction, suitable for the various digital printing systems equipped with basic color management functionality, wide adaptability.
Brief description of the drawings
Fig. 1 is a kind of color management flow of common digital printer
Fig. 2 is the implementation process figure of the color calibration method of the present invention
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Printing technology, which can be divided into, traditional has the printing technology of printing plate and the digital printing technologies without printing plate.Digital printing
Machine includes control computer and printing equipment etc., and a kind of color management flow of common digital printer is as shown in figure 1, control
Computer processed reads digital document, according to specified source characteristic file, be converted to device-independent color value, further according to current
The characteristic file of printing device, is converted to device-dependent color value, and printing mechanism controls ink amount according to the color value.It is theoretical
Upper to pass through color management, the color of printing is with regard to that can simulate the color of original copy, but in actual production, due to various equipment and material
Reason, the color of printing may deviate original copy color beyond the scope allowed, it is necessary to correct；Also one kind is probably Yong Huyao
The color for asking equipment to print simulates the effect of traditional printing as far as possible, it is also desirable to correction of color.The present invention proposes one kind by repairing
Change the method that source characteristic file realizes color correction, specific implementation method is as shown in Figure 2.
Step (1) is directed to the digital printer specified and digital document to be printed, it is necessary to be specified for digital document to be printed
Source characteristic file.The color mode of digital document to be printed includes RGB patterns and CMYK patterns, the corresponding characteristic file specified
For RGB-L*a*b*Characteristic file and CMYK-L*a*b*Characteristic file.Source characteristic file can be the spy of Contemporary Digital file insertion
Property file, can also specify certain characteristic file, the setting depending on operating personnel by the operation interface of control computer.
Source characteristic file A according to specified by digital document to be printed, obtained at the producer of characteristic file corresponding
Characterization color chart picture and characterization data file, general characteristic file typically can be from producer or the official of international organization
Square website, such as www.fogra.org, www.icc.org etc., download characteristic file and corresponding characterization color chart picture and characteristic
Change data file, the L of each color lump is recorded in characterization data file*a*b*Value, is designated as respectively in orderWherein L*a*b*The CIE that Zhi Zhi International Commission on Illumination is recommended
1976L*a*b*The color coordinate values in space, n is the color lump number for characterizing color chart picture, such as ANSI IT8.7/3 standard color cards
Color lump number is 928.
Specified characteristic file A is the source spy for characterizing color chart picture in the control computer operation interface of digital printer
Property file, print characteristic color chart picture, the L of each color lump is measured after drying*a*b*Value, is designated as respectively in orderThe target L of each color lump*a*b*Value, depending on behaviour
Make the expectation of personnel, if operating personnel wish that the color of printing reduces the color of original copy as far as possible, desired value is that original copy is embedding
The L of each color lump described in the characteristic file entered*a*b*Value, if operating personnel wish that the color of printing simulates biography as far as possible
The color of system printing machine, then after desired value is the same characterization color chart picture of conventional presses printing, what is obtained after testing is each
The L of color lump*a*b*Value, the target L of each color lump*a*b*Value is designated as in order
Step (2) calculates desired value respectively for the 1st color lump of characterization color chart pictureAfter printing
Measured valueWithWithBetween aberration
Value, according to the small preferential principle of aberration, the measured value of 30 color lump adjacent with the 1st color lump is chosen from whole color lumps, is designated as Basis respectively again
Position, from characterization data file recordFind out correspondence position
30 color lumps L*a*b*Value, is designated as
During in view of establishing mapping relations using the method for polynomial regression, item number is on the low side, and mapping relations precision is low；Item number
On the high side, the mapping relations of foundation are easily in concussion state, and it is using 11 multinomials that the present invention, which provides a kind of preferred scheme,.Profit
WithL*、a*、b*Value, 30 are built by formula (1)
The input matrix R that row 11 arranges：
UtilizeL*、a*、b*Value, built by formula (2)
The output matrix H of 30 rows 3 row：
Using least square method, mapping relations matrix M is solved by formula (3)：
M=(RTR)-1(RTH) (formula 3)
R in formula (3)TRepresenting matrix R transposition.
The target of 1st color lump of utilization level color chart pictureAccording to formula (4), characteristic text is calculated
The correction value of 1st color lump of part, is designated as
In formula (4)ForL*、a*、b*Value.Its allochromatic colour for characterizing color chart picture
Block, respectively basisValue, using same method, the 2nd color of characteristic file is calculated
The correction value for n-th of color lump that block arrives, is designated as
Step (3) withValue, the characteristic described in replacement step (1)
Change described in data fileRecycle amended characterization number
According to the characterization file B of documenting amendment.Utilization level data file makes characteristic file using ripe technology and work
Has software, such as the ProfileMaker of X. Rite Inc..
(4) specified characteristic file B is the source characteristic file for characterizing color chart picture in the operation interface of control computer, is beaten again
Print characterizes color chart picture, measures the L of each color lump*a*b*Value, is designated as in order
Calculate respectivelyWith With
WithBetween value of chromatism, then average color difference and maximum aberration are calculated, if average color difference and maximum aberration are less than setting
Desired value, perform step (6), although or average color difference or maximum aberration be unsatisfactory for the desired value of setting, operating personnel
Abandon correcting, also perform step (6), otherwise perform step (5).The aberration between two colors is calculated, then calculates average color difference
Belong to the ordinary technical knowledge of this area with maximum aberration.
Step (5) withFor the chromatic value of source characteristic file, withFor print result chromatic value, aim colour angle valueConstant, using the same method of step (2) and (3), amendment is special again
Property file, until meet require, or operating personnel stop amendment directly execution step (6).
Revised characterization file is appointed as by step (6) in the control computer operation interface of digital printer
The source characteristic file of digital document to be printed, complete printing.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.It is if these modifications and variations belong within the scope of the claims in the present invention and its equivalent technologies, then of the invention
It is also intended to comprising including these changes and modification.
Claims (4)
- A kind of 1. method for realizing digital printing color correction by changing characteristic file, it is characterised in that comprise the following steps：Step (1) is directed to the digital printer specified, the characteristic file A according to specified by digital document to be printed, acquisition pair The characterization color chart picture and characterization data file answered, characterization data file record the L of each color lump*a*b*Value, by suitable Sequence is designated as respectivelyIt is characterization color chart in specified characteristic file A Under conditions of the source characteristic file of picture, print characteristic color chart picture, the L of each color lump is measured*a*b*Value, remembers respectively in order For And the target L of each color lump*a*b*Value, is pressed Order is designated asWherein L*a*b*Zhi Zhi International Commission on Illumination is recommended The L of CIE 1976*a*b*The color coordinate values in space, n are the color lump number for characterizing color chart picture；Step (2) calculates respectively for the 1st color lump of characterization color chart pictureWith WithWithBetween value of chromatism, according to the small preferential principle of aberration, from whole The measured value of 30 color lumps is taken out in color lump, is designated asAgain From Find out the L of 30 color lumps of correspondence position*a*b*Value, is designated asWithFor independent variable, with For dependent variable, mapping is established using the method for multinomial least square regression Relation M；Mapping relations are established using ripe technology using multinomial least square regression；To characterize the target of the 1st of color chart picture the color lumpFor independent variable, using mapping relations M, spy is calculated The correction value of 1st color lump of property file, is designated asOther color lumps for characterizing color chart picture, respectively basisValue, using same side Method, the 2nd color lump of characteristic file is calculated to the correction value of n-th of color lump, is designated asStep (3) withValue, the characterization number described in replacement step (1) According to described in fileValue, recycles amended characterization data The characterization file B of documenting amendment；Utilization level data file makes characteristic file using ripe technology；(4) under conditions of specified characteristic file B is to characterize the source characteristic file of color chart picture, print characteristic color chart again Picture, measure the L of each color lump*a*b*Value, is designated as respectively in order Calculate respectivelyWith WithWithBetween value of chromatism, then average color difference and maximum aberration are calculated, if average color difference and maximum aberration are less than setting Desired value, perform step (6), although or average color difference or maximum aberration be unsatisfactory for the desired value of setting, operating personnel are put Amendment is abandoned, also performs step (6), otherwise performs step (5)；Aberration is calculated using ripe technology；Step (5) withFor the chromatic value of source characteristic file, withFor print result chromatic value, aim colour angle value It is constant, using the same method of step (2) and (3), characteristic file B is corrected again, and until meeting to require, or operating personnel stop Only amendment directly performs step (6)；Revised characterization file is appointed as numeral text to be printed by step (6) using the digital printer described in step (1) The source file of part, complete printing.
- 2. a kind of method for realizing digital printing color correction by changing characteristic file according to claim 1, its feature It is：The color mode of described digital document to be printed includes RGB patterns and CMYK patterns, corresponding specified characteristic File is RGB-L*a*b*Characteristic file and CMYK-L*a*b*Characteristic file.
- 3. a kind of method for realizing digital printing color correction by changing characteristic file according to claim 1, it is special Sign is：WithFor independent variable, withFor dependent variable, multinomial least square regression is utilized When method establishes mapping relations M, using 11 multinomials.
- 4. a kind of method for realizing digital printing color correction by changing characteristic file according to claim 1, it is special Sign is：Characterize the target L of color chart picture*a*b*Value is specified as needed by operating personnel, is conventional presses printing characteristic Change the L that color chart picture obtains*a*b*The L of source characteristic file specified by value or digital document to be printed*a*b*Value.
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| CN109741377A (en) * | 2018-11-30 | 2019-05-10 | 四川译讯信息科技有限公司 | A kind of image difference detection method |
| CN109978761A (en) * | 2017-12-28 | 2019-07-05 | 杭州海康威视系统技术有限公司 | A kind of method, apparatus and electronic equipment generating panoramic pictures |
| CN110021048A (en) * | 2019-03-22 | 2019-07-16 | 杭州电子科技大学上虞科学与工程研究院有限公司 | A kind of mass colour evaluation method of newspaper printing |
| CN111327787A (en) * | 2020-02-28 | 2020-06-23 | 杭州电子科技大学 | Correction method for soft proofing display color |
| CN112383673A (en) * | 2020-05-14 | 2021-02-19 | 佛山市阿瑞斯陶瓷科技有限公司 | Ceramic ink-jet color processing method and device, computer equipment and storage medium |
| CN112511717A (en) * | 2020-11-24 | 2021-03-16 | 深圳职业技术学院 | Mapping method and device of RGB image data, storage medium and electronic equipment |
| CN113411466A (en) * | 2021-05-08 | 2021-09-17 | 华南理工大学 | Multicolor chromatic aberration intelligent correction method and system based on color printing production system |
| CN115412641A (en) * | 2021-05-26 | 2022-11-29 | 深圳市汉森软件有限公司 | Color printing method and device based on color matching and color printing equipment |
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| CN109978761A (en) * | 2017-12-28 | 2019-07-05 | 杭州海康威视系统技术有限公司 | A kind of method, apparatus and electronic equipment generating panoramic pictures |
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| CN112383673A (en) * | 2020-05-14 | 2021-02-19 | 佛山市阿瑞斯陶瓷科技有限公司 | Ceramic ink-jet color processing method and device, computer equipment and storage medium |
| CN112511717A (en) * | 2020-11-24 | 2021-03-16 | 深圳职业技术学院 | Mapping method and device of RGB image data, storage medium and electronic equipment |
| CN112511717B (en) * | 2020-11-24 | 2023-03-28 | 深圳职业技术学院 | Mapping method and device of RGB image data, storage medium and electronic equipment |
| CN113411466A (en) * | 2021-05-08 | 2021-09-17 | 华南理工大学 | Multicolor chromatic aberration intelligent correction method and system based on color printing production system |
| CN113411466B (en) * | 2021-05-08 | 2022-09-20 | 华南理工大学 | Multicolor chromatic aberration intelligent correction method and system based on color printing production system |
| CN115412641A (en) * | 2021-05-26 | 2022-11-29 | 深圳市汉森软件有限公司 | Color printing method and device based on color matching and color printing equipment |
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Effective date of registration: 20191112 Address after: 510530 room 1923, building 3, Ruifeng center, Kaichuang Avenue, Huangpu District, Guangzhou City, Guangdong Province Patentee after: Guangzhou bud rice Intellectual Property Service Co., Ltd. Address before: Hangzhou City, Zhejiang province 310018 Xiasha Higher Education Park No. 2 street Patentee before: Hangzhou Electronic Science and Technology Univ |
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| TR01 | Transfer of patent right |
Effective date of registration: 20191203 Address after: 226600 Group 8, Baidian village, Baidian Town, Hai'an City, Nantong City, Jiangsu Province Patentee after: Jiangsu Zhenghong Color Printing Co., Ltd Address before: 510530 room 1923, building 3, Ruifeng center, Kaichuang Avenue, Huangpu District, Guangzhou City, Guangdong Province Patentee before: Guangzhou bud rice Intellectual Property Service Co., Ltd. |