CN110099193A - Spot color bearing calibration and device - Google Patents
Spot color bearing calibration and device Download PDFInfo
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- CN110099193A CN110099193A CN201810085183.XA CN201810085183A CN110099193A CN 110099193 A CN110099193 A CN 110099193A CN 201810085183 A CN201810085183 A CN 201810085183A CN 110099193 A CN110099193 A CN 110099193A
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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
- H04N1/6016—Conversion to subtractive colour signals
- H04N1/6019—Conversion to subtractive colour signals using look-up tables
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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
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Abstract
The present invention provides a kind of spot color bearing calibration and device, passes through the contrast parameter for obtaining spot color contrast to be corrected；The spot color one-dimensional look-up table obtained further according to the contrast parameter and in advance obtains color parameter of the spot color contrast to be corrected on printing equipment color space；The spot color contrast to be corrected is corrected according to the color parameter on the printing equipment color space.Method of the invention passes through the spot color one-dimensional look-up table obtained in advance, can fast implement the correction of spot color contrast to be corrected, so that the spot color and color of object after correction more match, improves printing device to the reproduction of spot color contrast.
Description
Technical field
The present invention relates to printing technology more particularly to a kind of spot color bearing calibration and devices.
Background technique
With the raising of the requirement of people's printing product quality, the application of spot color is especially more and more extensive in packaging field.
In output, the realization mechanism of spot color and four colors are essentially different for digital printing and digital proofing facility.Firstly, its color
Matching process is different, and what the output of four colors was focused on is overall output effect, and the target of spot color output is the standard of individual specific colors
Really simulation and reproduction.Since the value volume and range of product of spot color is various, accurate simulation and output spot color are current digital printing and number
Proofing system one of critical issue urgently to be resolved；In addition, many spot colors have exceeded digital printer and digital-code printer institute energy
The Color Range of realization, this also to digital printing and draws a design and brings very big difficulty, therefore spot color simulation at present mostly uses biography
System is drawn a design mode, such mode the problems such as there are time-consuming effort, inefficiency and inaccurate simulations, so the accurate reproduction of spot color begins
It is a technological difficulties eventually.
Spot color calibration method based on digital printing and digital printing type is several ink colors carried using equipment
It goes simulation spot color rather than uses spot ink, since be whether simulation there is simulation accurately.It is adopted in simulation process
The levels of precision of simulation is measured with the color difference Δ E of CIE1976L*a*b* color space, wherein the bigger expression spot color mould of value of chromatism
It is quasi- more unlike.Solving the problems, such as that color difference is bigger than normal can be there are many method, for example, increasing the colour gamut of equipment, replacement paper, increasing
Ink colors number etc., but these improvement need to improve cost, application limitation is larger, and if none good spot color school
Quasi- mechanism is also difficult effectively to play these performances.
Summary of the invention
The present invention provides a kind of spot color bearing calibration and device, to effectively improve printing device to the reproduction energy of spot color contrast
Power, spot color contrast and color of object after guaranteeing correction more match, and guarantee the accuracy of the entire tone reproduction of spot color.
It is an aspect of the invention to provide a kind of spot color bearing calibrations, comprising:
Obtain the contrast parameter of spot color contrast to be corrected；
The spot color one-dimensional look-up table obtained according to the contrast parameter and in advance obtains the spot color contrast to be corrected and exists
Color parameter on printing equipment color space, wherein the spot color one-dimensional look-up table is special belonging to the spot color contrast to be corrected
The table of comparisons of color parameter in the contrast parameter of each contrast of color and the printing equipment color space；
The spot color contrast to be corrected is corrected according to the color parameter on the printing equipment color space.
Another aspect of the present invention is to provide a kind of spot color means for correcting, comprising:
Module is obtained, for obtaining the contrast parameter of spot color contrast to be corrected；
Processing module, the spot color one-dimensional look-up table for obtaining according to the contrast parameter and in advance, obtain it is described to
Color parameter of the spot color contrast on printing equipment color space is corrected, wherein the spot color one-dimensional look-up table is described to be corrected
The table of comparisons of color parameter in the contrast parameter of each contrast of the affiliated spot color of spot color contrast and the printing equipment color space；
Correction module, for according to the color parameter on the printing equipment color space to the spot color contrast to be corrected
It is corrected.
Spot color bearing calibration provided by the invention and device, by the contrast parameter for obtaining spot color contrast to be corrected；Root again
The spot color one-dimensional look-up table obtained according to the contrast parameter and in advance obtains the spot color contrast to be corrected in printing equipment face
Color parameter in the colour space；According to the color parameter on the printing equipment color space to the spot color contrast to be corrected into
Row correction.Method of the invention passes through the spot color one-dimensional look-up table obtained in advance, can fast implement the school of spot color contrast to be corrected
Just, so that spot color and color of object after correction more match, printing device is improved to the reproduction of spot color contrast.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is spot color bearing calibration flow chart provided in an embodiment of the present invention；
Fig. 2 be another embodiment of the present invention provides spot color bearing calibration flow chart；
Fig. 3 be another embodiment of the present invention provides spot color bearing calibration flow chart；
Fig. 4 is the structure chart of spot color means for correcting provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is spot color bearing calibration flow chart provided in an embodiment of the present invention.As shown in Figure 1, present embodiments providing one
Kind spot color bearing calibration, specific step is as follows for this method:
S101, the contrast parameter for obtaining spot color contrast to be corrected.
In the present embodiment, the contrast parameter of spot color contrast to be corrected is used to distinguish different contrasts, can be 0~255
Any number in range, be to the dot percentage of each contrast from 0~100% be normalized after be mapped to 0~255 model
It encloses.The present embodiment can then directly acquire the contrast parameter of spot color contrast to be corrected, can also first obtain spot color contrast to be corrected
Dot percentage, dot percentage is then mapped to 0~255 range, obtains the contrast parameter of spot color contrast to be corrected, have
Body can inversely apply the aftermentioned contrast parameter X for obtaining any spot color contrasttCorresponding dot percentage parameter STtPublic affairs
Formula.
S102, the spot color one-dimensional look-up table obtained according to the contrast parameter and in advance, obtain the spot color to be corrected
Color parameter of the contrast on printing equipment color space, wherein the spot color one-dimensional look-up table is the spot color contrast to be corrected
The table of comparisons of color parameter in the contrast parameter of each contrast of affiliated spot color and the printing equipment color space.
In the present embodiment, by searching the spot color one-dimensional look-up table obtained in advance according to contrast parameter, the contrast is obtained
Color parameter on the corresponding printing equipment color space of parameter.Wherein spot color one-dimensional look-up table is the spot color contrast to be corrected
The table of comparisons of color parameter in the contrast parameter of each contrast of affiliated spot color and the printing equipment color space, and this is right
It is corrected according to table and obtains.More specifically, spot color color space generallys use L*a*b* color space, and printing equipment
Color space is generally CMYK color space.That is, spot color one-dimensional look-up table is spot color contrast parameter 0~255 in the present embodiment
With the table of comparisons of CMYK color parameter, the CMYK color of spot color contrast to be corrected is got by input spot color contrast parameter
Parameter.
S103, school is carried out to the spot color contrast to be corrected according to the color parameter on the printing equipment color space
Just.
In the present embodiment, it is carried out according to the color parameter on the corresponding printing equipment color space of spot color contrast to be corrected
Printing, so that the spot color contrast and color of object that print more match, closer to the true face of spot color contrast to be corrected
Color improves printing device to the reproduction of spot color contrast.
Spot color bearing calibration provided in this embodiment, by the contrast parameter for obtaining spot color contrast to be corrected；Further according to institute
It is empty in printing equipment color to obtain the spot color contrast to be corrected for the spot color one-dimensional look-up table stating contrast parameter and obtaining in advance
Between on color parameter；School is carried out to the spot color contrast to be corrected according to the color parameter on the printing equipment color space
Just.By the spot color one-dimensional look-up table obtained in advance, the correction of spot color contrast to be corrected can be fast implemented, so that special after correction
Color and color of object more match, and improve printing device to the reproduction of spot color contrast.
It on the basis of the above embodiments, further include obtaining before the contrast parameter of acquisition spot color contrast to be corrected described in S101
The step of taking spot color one-dimensional look-up table, as shown in Figure 2, the specific steps are as follows:
The color parameter of the spot color that S201, the correction printing equipment export on the spot.
In the present embodiment, by correcting the color parameter of the spot color of printing equipment output on the spot, export printing equipment
Color approaches spot color color of object, only in the spot color of the printing equipment output more accurate situation of color parameter on the spot, after
Continuing spot color one-dimensional look-up table obtained could be more acurrate, and then can accurately just treat correction spot color contrast and be corrected.Tool
Body, it is can be used in the present embodiment such as the spot color calibration method in patent CN201110390678.1: 1) spot color target value is set
For spot color standard value；2) multiple spot color values, the spot color standard value and the multiple spot color are set centered on spot color standard value
Value constitutes one group of spot color enumerated value；3) printing equipment is printed with spot color enumerated value, and output obtains color target figure；4) color target is measured
Each color lump on figure obtains the spot color measured value of each color lump；5) color of each spot color measured value and spot color target value is determined
Difference；6) determine that the smallest spot color measured value of color difference corresponds to the spot color enumerated value of color lump；7) it is determined described in the amplitude correction with setting
Spot color enumerated value as new spot color standard value；8) circulation executes above-mentioned steps 2-7, until minimum color difference rebounds, then
End loop, and the spot color enumerated value that the smallest spot color measured value of color difference corresponds to color lump is determined as final print value.Certainly
Other methods can also be used in the present embodiment to the color parameter of the spot color of printing equipment output on the spot is corrected, no longer go to live in the household of one's in-laws on getting married herein
It states.
Spot color reproduction, i.e. the heterochromia degree of the spot color of reality output and target data are evaluated in the present embodiment,
International Commission on Illumination's regulation indicates that the present embodiment is issued for 1976 using International Commission on Illumination with color difference (symbol is Δ E)
Colour difference formula, colour difference formula is as follows:
Wherein:It can indicate the color parameter of the color of object of spot color on the spot,Indicate print
The color parameter of the spot color of brush equipment output on the spot, namely the color parameter obtained after being exported in equipment through measurement.Pass through school
The color parameter of the spot color of positive printing equipment output on the spot, so that its Δ E between the color parameter of color of object be made to the greatest extent may be used
Can it is small, to guarantee the accurate reproduction of the color parameter of spot color on the spot.
S202, the white color parameter of paper is obtained.
In the present embodiment, since the printing of contrast among the Color influences spot color of paper white (paper white) is drawn a design effect
Fruit, therefore by obtaining the white color parameter of paper in the present embodiment, to combine the color parameter of the spot color after correction on the spot to special
Each contrast of color is corrected.Paper white colour parameter also can use ideal value, i.e. SC in certain the present embodimentw={ 100,0,0 }.
S203, according to the white color parameter of color parameter, the paper on the spot of the spot color after the correction and the print
The device characteristics look-up table of brush equipment obtains the spot color one-dimensional look-up table, wherein the device characteristics look-up table is spot color color
The table of comparisons of the color space of space and the printing equipment.
In the present embodiment, set by spot color color parameter, the paper on the spot after correction white color parameter, printing equipment
Standby characteristic look-up table obtains reflecting for each spot color contrast contrast parameter and the color parameter on corresponding printing equipment color space
Relationship is penetrated, to obtain the spot color one-dimensional look-up table.
Specifically, as shown in figure 3, color parameter, the paper described in S203 according to the spot color after the correction on the spot
The device characteristics look-up table of white color parameter and the printing equipment obtains the spot color one-dimensional look-up table, specifically includes:
S2031, by the white color parameter of the color parameter on the spot of the spot color after the correction and the paper, obtain any special
Color parameter of the color range tune on the spot color color space.
S2032, the device characteristics are searched according to color parameter of any spot color contrast on the spot color color space
Look-up table obtains the contrast parameter of each spot color contrast and the mapping of the color parameter on the corresponding printing equipment color space
Relationship, to obtain the spot color one-dimensional look-up table.
More specifically, by color that the color parameter on the spot of the spot color after the correction and the paper are white described in S2031
Parameter obtains color parameter of any spot color contrast on the spot color color space, specifically can include:
S301, the spot color contrast of any dot percentage parameter is obtained according to the following formula on the spot color color space
Color parameter, establish the color parameter look-up table on spot color color space:
Wherein, STiFor the dot percentage parameter of i-th of contrast of spot color, ∈ [1, p] is n × m, and m is spot color contrast
The quantity of contrast parameter, n are positive integer；Respectively the lightness component value of i-th of contrast of spot color, a* component value
With b* component value；pFor the dot percentage parameter of the spot color after correction on the spot；Spot color after respectively correcting
Lightness component value, a* component value and b* component value on the spot；ST1For the white dot percentage parameter of paper；Respectively
For the white lightness component value of paper, a* component value and b* component value.
In the present embodiment, the contrast of p different dot percentage parameters is obtained first on the spot color color space
Color parameter, establish the color parameter look-up table on spot color color space, then by the spot color contrast of required contrast parameter
Contrast parameter conversion at dot percentage parameter, by searching for the color parameter look-up table on spot color color space, to obtain
Obtain the color parameter on the corresponding spot color color space of contrast parameter.In the present embodiment, m is the number of the contrast parameter of spot color contrast
Amount, for 0~255 contrast parameter, m=256, n are positive integer, such as n=256 namely p=65536, pass through refinement
Dot percentage parameter, namely color parameter look-up table on spot color color space is specifically changed convenient for contrast parameter
It is counted as finding the color parameter on corresponding spot color color space after dot percentage parameter.
S302, the contrast parameter X for obtaining any spot color contrast according to the following formulatCorresponding dot percentage parameter STt:
Wherein, Xm、X1Spot color after the respectively described correction contrast parameter white with the paper on the spot.
S303, the contrast parameter X according to any spot color contrasttCorresponding dot percentage parameter STt, from the spot color face
Corresponding color parameter is obtained in color parameter look-up table in the colour space.
In the present embodiment, each contrast parameter X is obtainedtCorresponding dot percentage parameter STtAfterwards, from spot color color space
On color parameter look-up table in obtain corresponding color parameter, then search device characteristics look-up table, obtain each contrast color ginseng
The color space parameter of the color space of the corresponding printing equipment of number, to obtain the spot color one-dimensional look-up table.
In addition, may also include that between S302 and S303
S304, according to the following formula to the contrast parameter X of each spot color contrasttCorresponding dot percentage parameter STtIt carries out
Jitter Calculation, the ST after obtaining correctiont', and with the ST after the correctiont' as newt:
Wherein, STrmFor random number, q is the hierachy number of shake, and is odd number, STrm% indicates STrmTo q remainder.
In the present embodiment, in order to avoid contrast generates jump among spot color, random number ST is introduced herermTo STtIt is trembled
It is dynamic to calculate, by the hierachy number of setting shake in above-mentioned formula, and by random number STrmTo q remainder, thus according to the difference of remainder
Using different STt' value can effectively solve scala media tuningout color, jump and other issues.
The spot color bearing calibration of above-described embodiment is described in detail below with reference to a specific example.
In the present embodiment, output equipment used is Epson7910 printer, and ink is original-pack 10 color ink of Epson, paper
For Fantac Inkjet Proofing Paper (190g), measuring device is the EyeOne-iSis of X. Rite Inc..Printing is set
Standby color space CMYK color space.Spot color color space be and device-independent L*a*b*Color space, the present embodiment is to correct
Pan is led to for the spot color PANTONE 330C in the PANTONE solidcoated of spot color library.
1) firstly, correcting the color parameter of the spot color of the printing equipment output on the spot.
Spot color PANTONE 330C color parameter value before correction, i.e. color of object parameter value are SCst=31.89 ,-
26.32, -4.71 }, after exporting in equipment, the color of color (measured value) and color of object of its output is calculated with colour difference formula
Poor Δ E=1.75.By in such a way that the spot color calibration method in such as patent CN201110390678.1 is based on Closed-cycle correction
Correct spot color on the spot, spot color after correction color parameter value SC on the spots={ 31.82, -25.87, -5.85 }, the color of output
The color difference Δ E=0.59 of (measured value) and color of object.It can be seen that the spot color and color of object after correction are closer, realize accurate
Correction.It should be noted that " equal sign " means " being expressed as " here, behind related to color parameter value and data with
This method indicates.
2) the white color parameter of paper is obtained.
In the present embodiment, paper white colour parameter value takes ideal data, i.e. SCw={ 100,0,0 }.
3) the color parameter look-up table on spot color color space is established.
In order to improve the subsequent precision tabled look-up, dot percentage parameter takes 65536 grades, i.e. p=65536 in the present embodiment,
In order to calculate and convenient storage, 0~65535 range namely ST are mapped to after taking normalization1=0, STp=65535,i∈[0,
65535.SCstAnd SCsNumerical value substitute into formula respectively:
According to formula as above, face of the spot color contrast of any dot percentage parameter on the spot color color space is obtained
Color parameter establishes the color parameter look-up table on spot color color space, as shown in table 1.
Table 1
4) the contrast parameter X of any spot color contrast is obtainedtCorresponding dot percentage parameter STt。
In the present embodiment, the contrast parameter of spot color contrast just uses 0~255 namely m=256, and the white contrast parameter of paper is X1=
0, the contrast parameter of spot color on the spot is Xm=255, formula is substituted into respectively:
By the contrast parameter X of the available any spot color contrast of above-mentioned formulatCorresponding dot percentage parameter STt。
5) to each spot color contrast contrast parameter XtCorresponding dot percentage parameter STtCarry out Jitter Calculation.
According to the following formula to the contrast parameter X of each spot color contrasttCorresponding dot percentage parameter STtIt is shaken
It calculates, the ST after obtaining correctiont', and with the ST after the correctiont' as newt:
Wherein, the hierachy number of shake takes q=3, random number(wherein STr'm∈'s [0,255] is random
Number).Namely:
By by random number STrmTo 3 remainders, to use different ST according to the difference of remaindert' value, can effectively solve
Scala media tuningout color, jump and other issues.
6) with STt' contrast parameter the X as spot color contrasttCorresponding dot percentage parameter, from spot color color space
Color parameter look-up table in obtain corresponding color parameter.
The present embodiment searches every ST by the color parameter look-up table on spot color color spacet' corresponding color ginseng
Number, to obtain the contrast parameter X of each spot color contrasttCorresponding color parameter, as shown in table 2.
Table 2
7) spot color one-dimensional look-up table is established.
In the present embodiment, device characteristics are searched according to color parameter of any spot color contrast on spot color color space and are searched
Spot color color space is mapped to CMYK color spatially by table, and the contrast parameter for obtaining each spot color contrast is set with corresponding printing
The mapping relations of color parameter on standby color space, to obtain spot color one-dimensional look-up table, as shown in table 3.
Table 3
By step 1-7 in the present embodiment, the foundation of spot color one-dimensional look-up table is completed.
And the application for spot color one-dimensional look-up table, then it is realized using step 8-10.
8) the contrast parameter of spot color contrast to be corrected is obtained.
In the present embodiment, such as to contrast parameter the spot color contrast for being 251 is corrected, then known contrast parameter is
251。
9) the spot color one-dimensional look-up table obtained according to the contrast parameter and in advance obtains the spot color contrast to be corrected
Color parameter on printing equipment color space.
In the present embodiment, by searching for spot color one-dimensional look-up table as shown in table 3, the CMYK face of the spot color contrast can be obtained
Color parameter is { 91,55,67,34 }.
10) the spot color contrast to be corrected is corrected according to the color parameter on the printing equipment color space.
In the present embodiment, when the spot color contrast for being if desired 251 to contrast parameter is drawn a design, printing equipment is with CMYK
Color parameter is exported for { 91,55,67,34 }, so that the spot color contrast color is pure, spot color tone reproduction effect
It is good.
In addition, spot color one-dimensional look-up table provided in this embodiment can also be used in it is counter look into, namely first obtain CMYK color ginseng
Number, then determines corresponding contrast parameter by spot color one-dimensional look-up table, so which spot color contrast is learnt is.
Fig. 4 is the structure chart of spot color means for correcting provided in an embodiment of the present invention.The present embodiment provides a kind of corrections of spot color
Device can execute the process flow of spot color bearing calibration embodiment offer, as shown in figure 4, the spot color of the present embodiment corrects dress
It sets including obtaining module 401, processing module 402 and correction module 403.
Wherein, module 401 is obtained, for obtaining the contrast parameter of spot color contrast to be corrected；
Processing module 402, the spot color one-dimensional look-up table for obtaining according to the contrast parameter and in advance, described in acquisition
Color parameter of the spot color contrast to be corrected on printing equipment color space, wherein the spot color one-dimensional look-up table is described to school
The contrast parameter of each contrast of the positive affiliated spot color of spot color contrast and compareing for the color parameter on the printing equipment color space
Table；
Correction module 403, for according to the color parameter on the printing equipment color space to the spot color to be corrected
Contrast is corrected.
Further, the spot color means for correcting of the present embodiment further include:
Correction module 404 on the spot, for correcting the color parameter of the spot color of the printing equipment output on the spot；
The white acquisition module 405 of paper, for obtaining the white color parameter of paper；
The processing module 402 is also used to, according to the white face of color parameter, the paper of the spot color after the correction on the spot
The device characteristics look-up table of color parameter and the printing equipment obtains the spot color one-dimensional look-up table, wherein the equipment is special
Property look-up table be spot color color space and the printing equipment color space the table of comparisons.
Further, the processing module 402 is specifically used for:
By the white color parameter of the color parameter on the spot of the spot color after the correction and the paper, any spot color contrast is obtained
Color parameter on the spot color color space；
The device characteristics look-up table is searched according to color parameter of any spot color contrast on the spot color color space,
The contrast parameter of each spot color contrast and the mapping relations of the color parameter on the corresponding printing equipment color space are obtained, from
And obtain the spot color one-dimensional look-up table.
Further, the processing module 402 is specifically used for:
Face of the spot color contrast of any dot percentage parameter on the spot color color space is obtained according to the following formula
Color parameter establishes the color parameter look-up table on spot color color space:
Wherein, STiFor the dot percentage parameter of i-th of contrast of spot color, ∈ [1, p] is n × m, and m is spot color contrast
The quantity of contrast parameter, n are positive integer；Respectively the lightness component value of i-th of contrast of spot color, a* component value
With b* component value；pFor the dot percentage parameter of the spot color after correction on the spot；Spot color after respectively correcting
Lightness component value, a* component value and b* component value on the spot；ST1For the white dot percentage parameter of paper；Respectively
For the white lightness component value of paper, a* component value and b* component value；
The contrast parameter X of any spot color contrast is obtained according to the following formulatCorresponding dot percentage parameter STt:
Wherein, Xm、X1Spot color after the respectively described correction contrast parameter white with the paper on the spot；
According to the contrast parameter X of any spot color contrasttCorresponding dot percentage parameter STt, from the spot color color space
On color parameter look-up table in obtain corresponding color parameter.
Further, the processing module 402 is also used to:
According to the following formula to the contrast parameter X of each spot color contrasttCorresponding dot percentage parameter STtIt is shaken
It calculates, the ST after obtaining correctiont', and with the ST after the correctiont' as newt:
Wherein, STrmFor random number, q is the hierachy number of shake, and is odd number, STrm% indicates STrmTo q remainder.
Spot color means for correcting provided in an embodiment of the present invention can be specifically used for executing the reality of method provided by above-mentioned Fig. 1-3
Example is applied, details are not described herein again for concrete function.
Spot color means for correcting provided in this embodiment, by the contrast parameter for obtaining spot color contrast to be corrected；Further according to institute
It is empty in printing equipment color to obtain the spot color contrast to be corrected for the spot color one-dimensional look-up table stating contrast parameter and obtaining in advance
Between on color parameter；School is carried out to the spot color contrast to be corrected according to the color parameter on the printing equipment color space
Just.By the spot color one-dimensional look-up table obtained in advance, the correction of spot color contrast to be corrected can be fast implemented, so that special after correction
Color and color of object more match, and improve printing device to the reproduction of spot color contrast.
In several embodiments provided by the present invention, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can be tied
Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or logical of device or unit
Letter connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit being realized in the form of SFU software functional unit can store and computer-readable deposit at one
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer
It is each that equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute the present invention
The part steps of embodiment the method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read-
Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic or disk etc. it is various
It can store the medium of program code.
Those skilled in the art can be understood that, for convenience and simplicity of description, only with above-mentioned each functional module
Division progress for example, in practical application, can according to need and above-mentioned function distribution is complete by different functional modules
At the internal structure of device being divided into different functional modules, to complete all or part of the functions described above.On
The specific work process for stating the device of description, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of spot color bearing calibration characterized by comprising
Obtain the contrast parameter of spot color contrast to be corrected；
The spot color one-dimensional look-up table obtained according to the contrast parameter and in advance obtains the spot color contrast to be corrected and is printing
Color parameter in device color spaces, wherein the spot color one-dimensional look-up table is the affiliated spot color of spot color contrast to be corrected
The table of comparisons of color parameter in the contrast parameter of each contrast and the printing equipment color space；
The spot color contrast to be corrected is corrected according to the color parameter on the printing equipment color space.
2. the method according to claim 1, wherein before the contrast parameter for obtaining spot color contrast to be corrected,
Further include:
Correct the color parameter of the spot color of the printing equipment output on the spot；
Obtain the white color parameter of paper；
According to the equipment of color parameter, the paper of the spot color after correction on the spot white color parameter and the printing equipment
Characteristic look-up table obtains the spot color one-dimensional look-up table, wherein the device characteristics look-up table is spot color color space and the print
The table of comparisons of the color space of brush equipment.
3. according to the method described in claim 2, it is characterized in that, the color ginseng of the spot color according to after the correction on the spot
The device characteristics look-up table of the white color parameter of several, the described paper and the printing equipment obtains the spot color one-dimensional look-up table,
It specifically includes:
By the white color parameter of the color parameter on the spot of the spot color after the correction and the paper, any spot color contrast is obtained in institute
State the color parameter on spot color color space；
The device characteristics look-up table is searched according to color parameter of any spot color contrast on the spot color color space, is obtained
The mapping relations of the contrast parameter of each spot color contrast and the color parameter on the corresponding printing equipment color space, to obtain
Obtain the spot color one-dimensional look-up table.
4. according to the method described in claim 3, it is characterized in that, the color parameter of the spot color by after the correction on the spot
And the color parameter that the paper is white, color parameter of any spot color contrast on the spot color color space is obtained, is specifically included:
Color ginseng of the spot color contrast of any dot percentage parameter on the spot color color space is obtained according to the following formula
Number, establishes the color parameter look-up table on spot color color space:
Wherein, STiFor the dot percentage parameter of i-th of contrast of spot color, i ∈ [1, p], p are n × m, and m is the contrast of spot color contrast
The quantity of parameter, n are positive integer；Respectively the lightness component value of i-th of contrast of spot color, a*Component value and b*
Component value；STpFor the dot percentage parameter of the spot color after correction on the spot；Spot color after respectively correcting is real
The lightness component value on ground, a*Component value and b*Component value；ST1For the white dot percentage parameter of paper；Respectively
The white bright component value of paper, a*Component value and b*Component value；
The contrast parameter X of any spot color contrast is obtained according to the following formulatCorresponding dot percentage parameter STt:
Wherein, Xm、X1Spot color after the respectively described correction contrast parameter white with the paper on the spot；
According to the contrast parameter X of any spot color contrasttCorresponding dot percentage parameter STt, from the spot color color space
Corresponding color parameter is obtained in color parameter look-up table.
5. according to the method described in claim 4, it is characterized in that, the contrast parameter X for obtaining any spot color contrasttIt is corresponding
Dot percentage parameter STtAfterwards, further includes:
According to the following formula to the contrast parameter X of each spot color contrasttCorresponding dot percentage parameter STtJitter Calculation is carried out,
ST ' after obtaining correctiont, and with the ST ' after the correctiontAs new STt:
Wherein, STrmFor random number, q is the hierachy number of shake, and q is odd number, STrm%q indicates STrmTo q remainder.
6. a kind of spot color means for correcting characterized by comprising
Module is obtained, for obtaining the contrast parameter of spot color contrast to be corrected；
Processing module, the spot color one-dimensional look-up table for obtaining according to the contrast parameter and in advance, obtains described to be corrected
Color parameter of the spot color contrast on printing equipment color space, wherein the spot color one-dimensional look-up table is the spot color to be corrected
The table of comparisons of color parameter in the contrast parameter of each contrast of the affiliated spot color of contrast and the printing equipment color space；
Correction module, for being carried out according to the color parameter on the printing equipment color space to the spot color contrast to be corrected
Correction.
7. device according to claim 6, which is characterized in that further include:
Correction module on the spot, for correcting the color parameter of the spot color of the printing equipment output on the spot；
The white acquisition module of paper, for obtaining the white color parameter of paper；
The processing module is also used to, according to the white color parameter of color parameter, the paper of the spot color after correction on the spot and
The device characteristics look-up table of the printing equipment obtains the spot color one-dimensional look-up table, wherein the device characteristics look-up table is special
The table of comparisons of the color space of color color space and the printing equipment.
8. device according to claim 7, which is characterized in that the processing module is specifically used for:
By the white color parameter of the color parameter on the spot of the spot color after the correction and the paper, any spot color contrast is obtained in institute
State the color parameter on spot color color space；
The device characteristics look-up table is searched according to color parameter of any spot color contrast on the spot color color space, is obtained
The mapping relations of the contrast parameter of each spot color contrast and the color parameter on the corresponding printing equipment color space, to obtain
Obtain the spot color one-dimensional look-up table.
9. device according to claim 8, which is characterized in that the processing module is specifically used for:
Color ginseng of the spot color contrast of any dot percentage parameter on the spot color color space is obtained according to the following formula
Number, establishes the color parameter look-up table on spot color color space:
Wherein, STiFor the dot percentage parameter of i-th of contrast of spot color, i ∈ [1, p], p are n × m, and m is the contrast of spot color contrast
The quantity of parameter, n are positive integer；Respectively the lightness component value of i-th of contrast of spot color, a*Component value and b*
Component value；STpFor the dot percentage parameter of the spot color after correction on the spot；Spot color after respectively correcting is real
The lightness component value on ground, a*Component value and b*Component value；ST1For the white dot percentage parameter of paper；Respectively
The white lightness component value of paper, a*Component value and b*Component value；
The contrast parameter X of any spot color contrast is obtained according to the following formulatCorresponding dot percentage parameter STt:
Wherein, Xm、X1Spot color after the respectively described correction contrast parameter white with the paper on the spot；
According to the contrast parameter X of any spot color contrasttCorresponding dot percentage parameter STt, from the spot color color space
Corresponding color parameter is obtained in color parameter look-up table.
10. device according to claim 9, which is characterized in that the processing module is also used to:
According to the following formula to the contrast parameter X of each spot color contrasttCorresponding dot percentage parameter STtJitter Calculation is carried out,
ST ' after obtaining correctiont, and with the ST ' after the correctiontAs new STt:
Wherein, STrmFor random number, q is the hierachy number of shake, and q is odd number, STrm%q indicates SmrmTo q remainder.
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| CN111640161A (en) * | 2020-07-09 | 2020-09-08 | 上海紫恩数码科技有限公司 | Method for manufacturing true material color card |
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