CN106985512A - A kind of ink control method and device of printed matter - Google Patents
A kind of ink control method and device of printed matter Download PDFInfo
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- CN106985512A CN106985512A CN201710213803.9A CN201710213803A CN106985512A CN 106985512 A CN106985512 A CN 106985512A CN 201710213803 A CN201710213803 A CN 201710213803A CN 106985512 A CN106985512 A CN 106985512A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/02—Ducts, containers, supply or metering devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
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- Inking, Control Or Cleaning Of Printing Machines (AREA)
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Abstract
The application is related to a kind of ink control method and device of printed matter, wherein, methods described includes：Obtain the print sample of predetermined number；Wherein, the print sample is determined according to squeegee pressure, printing-ink type, paper from amount and inking amount；Measure and record the chromatic value and density value of the print sample；The opening relationships model between the chromatic value and density value that measurement is obtained, and calculate the optimum density value based on minimum aberration；According to the optimum density value, at least one candidate's density value is determined in density value critical field, and calculate the derivative value of the corresponding color difference function of each described candidate's density value；The derivative value of the color difference function obtained according to calculating, is increased or is reduced to current quantity of ink.The technical scheme that the application is provided, can judge it is currently to need to increase or reduce quantity of ink exactly, so that the cost for improving the printing quality of printed matter and saving in printing process.
Description
Technical field
The application is related to printing quality control technical field, the ink control method and dress of more particularly to a kind of printed matter
Put.
Background technology
During actual print production, control inking amount is the primary hand of machine operations personnel control printed matter aberration
Section.
At present, operating personnel are mostly by virtue of experience to come to be controlled the inking amount of printed matter.However, once running into print
Refreshing product, or when running into new operating instrument, operating personnel can not generally judge that the increase inking amount still subtracts exactly
Few inking amount, so as to be unable to reach good printing effect.Like this, it will usually cause the waste of paper, ink, so as to cause
Printing cost is improved, production efficiency reduction.
The content of the invention
The purpose of the application is the ink control method and device for providing a kind of printed matter, can judge current exactly
It is to need to increase or reduce quantity of ink, so that the cost for improving the printing quality of printed matter and saving in printing process.
To achieve the above object, on the one hand the application provides a kind of ink control method of printed matter, methods described bag
Include：Obtain the print sample of predetermined number；Wherein, the print sample is selected according to squeegee pressure, printing-ink type, paper
Amount and inking amount are determined；Measure and record the chromatic value and density value of the print sample；In the obtained chromatic value of measurement and
Opening relationships model between density value, and calculate the optimum density value based on minimum aberration；According to the optimum density value, close
Determine at least one candidate's density value in angle value critical field, and calculate the corresponding color difference function of each described candidate's density value
Derivative value；The derivative value of the color difference function obtained according to calculating, is increased or is reduced to current quantity of ink.
Further, the parameters of the print sample are as described below：Squeegee pressure is between 200~350N；Printing
Ink type is four coloring agent painting plate ink Y, M, C, BK；Paper is 157~250g/m from amount2Art paper；Inking amount scope
For 0.005~0.025g；The predetermined number is 10~30.
Further, the chromatic value and density value for measuring and recording the print sample include：By the print sample of printing
Place more than two days, to ensure that the print sample is dried；The survey of 10~30 is chosen on the print sample with colorimeter
Point is measured, between 5~10cm, measure Lab chromatic values, and obtain the average value of chromatic value, will at the distance between adjacent 2 points
The average value of the chromatic value as the print sample chromatic value；10~30 are chosen on the print sample with densitometer
Individual measurement point, the distance between adjacent 2 points between 5~10cm, measure the density value of primary colors on the print sample.
Further, opening relationships model according to the following equation：
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) represents the chromatic value of L * channel, and y (a) represents the chromatic value of a passages, and y (b) represents the colourity of b passages
Value；ki, mi, PiIt is fitting coefficient, wherein, i is 1 to n integer；X represents density value.
Further, calculating the optimum density value based on minimum aberration includes：
The relation between density value and aberration is determined according to the following equation：
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E represent color difference function, y (L1) and y (L2) respectively represent L * channel two chromatic values, y (a1) and y
(a2) respectively represent a passages two chromatic values, y (b1) and y (b2) respectively represent b passages two chromatic values；
Above-mentioned color difference function is differentiated, and calculates corresponding density value when the derivative value of color difference function is 0, and will be calculated
Obtained density value is used as the optimum density value.
Further, calculating the derivative value of the corresponding color difference function of each described candidate's density value includes：
Each described candidate's density value is substituted into the derivative of the color difference function, and using result of calculation as described in each
The derivative value of the corresponding color difference function of candidate's density value.
Further, the derivative value of the color difference function obtained according to calculating, is increased or is subtracted to current quantity of ink
Include less：
When the derivative value for calculating obtained color difference function is more than 0, current quantity of ink is reduced；
When the derivative value for calculating obtained color difference function is less than 0, by current quantity of ink increase.
The application also provides a kind of ink control apparatus of printed matter, and described device includes：Print sample acquiring unit, is used
In the print sample for obtaining predetermined number；Wherein, the print sample is selected according to squeegee pressure, printing-ink type, paper
Amount and inking amount are determined；Colorimetric density information measurement unit, for measuring and recording the chromatic value of the print sample and close
Angle value；Optimum density value computing unit, for the opening relationships model between the chromatic value and density value that measurement is obtained, and is calculated
Optimum density value based on minimum aberration；Derivative value computing unit, for according to the optimum density value, in density value standard model
Interior at least one candidate's density value of determination is enclosed, and calculates the derivative value of the corresponding color difference function of each described candidate's density value；Oil
Ink amount operating unit, for according to the derivative value for calculating obtained color difference function, current quantity of ink being increased or being subtracted
It is few.
Further, optimum density value computing unit opening relationships model according to the following equation：
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) represents the chromatic value of L * channel, and y (a) represents the chromatic value of a passages, and y (b) represents the colourity of b passages
Value；ki, mi, PiIt is fitting coefficient, wherein, i is 1 to n integer；X represents density value.
Further, the optimum density value computing unit includes：
Color difference function determining module, for determining the relation between density value and aberration according to the following equation：
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E represent color difference function, y (L1) and y (L2) respectively represent L * channel two chromatic values, y (a1) and y
(a2) respectively represent a passages two chromatic values, y (b1) and y (b2) respectively represent b passages two chromatic values；
Extreme value determining module, for being differentiated to above-mentioned color difference function, and calculates correspondence when the derivative value of color difference function is 0
Density value, and be used as the optimum density value using obtained density value is calculated.
Therefore, the application determines the density of printed matter based on minimum aberration, sets up the matching relationship of colourity and density,
By analysing method scientifically, the corresponding optimum density value of the minimum aberration of printed matter is obtained, and equation model is applied into actual life
In production, print quality can be improved, printing process is reduced, so as to reach cost-effective, raising profit, improves the effect of quality
Really.
Brief description of the drawings
Fig. 1 is the flow chart of the ink control method of printed matter in the application；
Fig. 2 is the structural representation of the ink control apparatus of printed matter in the application.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the application, it is real below in conjunction with the application
The accompanying drawing in mode is applied, the technical scheme in the application embodiment is clearly and completely described, it is clear that described
Embodiment is only a part of embodiment of the application, rather than whole embodiments.Based on the embodiment party in the application
Formula, all other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made all should
When the scope for belonging to the application protection.
Referring to Fig. 1, the application embodiment provides a kind of ink control method of printed matter, methods described includes：
S1：Obtain the print sample of predetermined number；Wherein, the print sample according to squeegee pressure, printing-ink type,
Paper is determined from amount and inking amount；
S2：Measure and record the chromatic value and density value of the print sample；
S3：The opening relationships model between the chromatic value and density value that measurement is obtained, and calculate based on minimum aberration most
Good density value；
S4：According to the optimum density value, at least one candidate's density value is determined in density value critical field, and calculate
The derivative value of the corresponding color difference function of each described candidate's density value；
S5：The derivative value of the color difference function obtained according to calculating, is increased or is reduced to current quantity of ink.
In the present embodiment, the parameters of the print sample are as described below：
Squeegee pressure is between 200~350N；Printing-ink type is four coloring agent painting plate ink Y, M, C, BK；Paper is selected
Consumption is 157~250g/m2Art paper；Inking amount scope is 0.005~0.025g；The predetermined number is 10~30.
In the present embodiment, the chromatic value and density value for measuring and recording the print sample include：
The print sample of printing is placed more than two days, to ensure that the print sample is dried；
Choose on the print sample measurement point of 10~30 with colorimeter, the distance between adjacent 2 points 5~
Between 10cm, Lab chromatic values are measured, and obtain the average value of chromatic value, the average value of the chromatic value are regard as the print
The chromatic value of brush specimen page；
Choose on the print sample measurement point of 10~30 with densitometer, the distance between adjacent 2 points 5~
Between 10cm, the density value of primary colors on the print sample is measured.
In the present embodiment, opening relationships model according to the following equation：
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) represents the chromatic value of L * channel, and y (a) represents the chromatic value of a passages, and y (b) represents the colourity of b passages
Value；ki, mi, PiIt is fitting coefficient, wherein, i is 1 to n integer；X represents density value.
In the present embodiment, calculating the optimum density value based on minimum aberration includes：
The relation between density value and aberration is determined according to the following equation：
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E represent color difference function, y (L1) and y (L2) respectively represent L * channel two chromatic values, y (a1) and y
(a2) respectively represent a passages two chromatic values, y (b1) and y (b2) respectively represent b passages two chromatic values；
Above-mentioned color difference function is differentiated, and calculates corresponding density value when the derivative value of color difference function is 0, and will be calculated
Obtained density value is used as the optimum density value.
In the present embodiment, calculating the derivative value of the corresponding color difference function of each described candidate's density value includes：
Each described candidate's density value is substituted into the derivative of the color difference function, and using result of calculation as described in each
The derivative value of the corresponding color difference function of candidate's density value.
In the present embodiment, the derivative value of the color difference function obtained according to calculating, increases current quantity of ink
Or reduction includes：
When the derivative value for calculating obtained color difference function is more than 0, current quantity of ink is reduced；
When the derivative value for calculating obtained color difference function is less than 0, by current quantity of ink increase.
For example it is bright below：
(1) choose printability instrument squeegee pressure in 250N, selection hectographic printing C ink, use quantification of 157g/m2Copperplate
Paper, is cut into 20cm*19cm sizes；Inking amount is in 0.0065g~0.0214g；Print specimen page 10.
(2) placing the specimen page of printing ensures that specimen page is dried for 3 days.10 measurement points, point are chosen on specimen page with colorimeter
The distance between 7cm, measure chromatic value Lab, and obtain the average value of chromatic value.Again 10 are chosen with densitometer
Measurement point.The distance of measurement point measures the color density value of primary colors in 7cm.Finally data record is got off as shown in table 1.
Table 1 tests the chromatic value and density value of specimen page
Based on data in table 1, the relation function between matlab fit Densities value and chromatic value can be used.Density value is plan
Argument of function x is closed, chromatic value L, a, b are respectively dependent variable y (L), y (a), y (b), and fitting function is set up using matlab
Relation carries out the fitting of polynomial function n powers, obtains quadratic fit function and meets printing engineering needs,
Y (L)=0.3458x2-14.742x+75.135
Y (a)=8.2874x2-19.111x-14.638
Y (b)=6.5514x2-31.956x-13.697
Three chromatic value equations for simulating are brought into CIE1976lab colour difference formulas, i.e.,：
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
The functional relation for calculating aberration and density value is：
△E2=111.72x4-745.67x3+2463.98x2-3768.59x+2223.59
Equation is obtained to function derivation：2 △ E=446.88x3-2237.01x2+4927.96x-3768.59.△ E=0 are made,
Extreme value is obtained, when obtaining C colors minimum aberration, optimal field density is 1.42.Meet national standard cyan C field density critical field
Between 1.4~1.5, then three groups of candidate's density values, respectively 1.40,1.42,1.43 can be selected.
Above three candidate's density value can be brought into the equation after derivation, each candidate's density is obtained so as to calculate
It is worth the derivative value of corresponding color difference function.Specifically, calculating obtained derivative value can be as shown in table 2：
The candidate's density value of table 2 and derivative value corresponding relation
According to table 2, when density value is 1.40 and 1.42, in order to reach minimum aberration, machine operations are now needed
Increase ink amount；If density value is 1.43, now in order to reach minimum aberration, now machine operations need to reduce ink amount.
Referring to Fig. 2, the application also provides a kind of ink control apparatus of printed matter, described device includes：
Print sample acquiring unit 100, the print sample for obtaining predetermined number；Wherein, the print sample according to
Squeegee pressure, printing-ink type, paper are determined from amount and inking amount；
Colorimetric density information measurement unit 200, chromatic value and density value for measuring and recording the print sample；
Optimum density value computing unit 300, for the opening relationships model between the chromatic value and density value that measurement is obtained,
And calculate the optimum density value based on minimum aberration；
Derivative value computing unit 400, for according to the optimum density value, at least one to be determined in density value critical field
Individual candidate's density value, and calculate the derivative value of the corresponding color difference function of each described candidate's density value；
Quantity of ink operating unit 500, for according to the derivative value for calculating obtained color difference function, entering to current quantity of ink
Row increase is reduced.
In the present embodiment, optimum density value computing unit opening relationships model according to the following equation：
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) represents the chromatic value of L * channel, and y (a) represents the chromatic value of a passages, and y (b) represents the colourity of b passages
Value；ki, mi, PiIt is fitting coefficient, wherein, i is 1 to n integer；X represents density value.
In the present embodiment, the optimum density value computing unit includes：
Color difference function determining module, for determining the relation between density value and aberration according to the following equation：
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E represent color difference function, y (L1) and y (L2) respectively represent L * channel two chromatic values, y (a1) and y
(a2) respectively represent a passages two chromatic values, y (b1) and y (b2) respectively represent b passages two chromatic values；
Extreme value determining module, for being differentiated to above-mentioned color difference function, and calculates correspondence when the derivative value of color difference function is 0
Density value, and be used as the optimum density value using obtained density value is calculated.
Therefore, the application determines the density of printed matter based on minimum aberration, sets up the matching relationship of colourity and density,
By analysing method scientifically, the corresponding optimum density value of the minimum aberration of printed matter is obtained, and equation model is applied into actual life
In production, print quality can be improved, printing process is reduced, so as to reach cost-effective, raising profit, improves the effect of quality
Really.
Those skilled in the art are supplied to the purpose described to the descriptions of the various embodiments of the application above.It is not
Be intended to exhaustion or it is not intended to and limits the invention to single disclosed embodiment.As described above, the application's is various
Substitute and change will be apparent for above-mentioned technology one of ordinary skill in the art.Therefore, although specifically beg for
Some alternative embodiments have been discussed, but other embodiment will be apparent, or those skilled in the art are relative
Easily draw.The application is intended to be included in this all replacement of the invention discussed, modification and change, and falls
Other embodiment in the spirit and scope of above-mentioned application.
Claims (10)
1. the ink control method of a kind of printed matter, it is characterised in that methods described includes：
Obtain the print sample of predetermined number；Wherein, the print sample is selected according to squeegee pressure, printing-ink type, paper
Consumption and inking amount are determined；
Measure and record the chromatic value and density value of the print sample；
The opening relationships model between the chromatic value and density value that measurement is obtained, and calculate the optimum density based on minimum aberration
Value；
According to the optimum density value, at least one candidate's density value is determined in density value critical field, and calculate each institute
State the derivative value of the corresponding color difference function of candidate's density value；
The derivative value of the color difference function obtained according to calculating, is increased or is reduced to current quantity of ink.
2. the ink control method of printed matter according to claim 1, it is characterised in that every ginseng of the print sample
Number is as described below：
Squeegee pressure is between 200~350N；Printing-ink type is four coloring agent painting plate ink Y, M, C, BK；Paper is from amount
For 157~250g/m2Art paper；Inking amount scope is 0.005~0.025g；The predetermined number is 10~30.
3. the ink control method of printed matter according to claim 1, it is characterised in that measure and record the printing sample
The chromatic value and density value opened include：
The print sample of printing is placed more than two days, to ensure that the print sample is dried；
The measurement point of 10~30 is chosen on the print sample with colorimeter, in 5~10cm at the distance between adjacent 2 points
Between, Lab chromatic values are measured, and the average value of chromatic value is obtained, it regard the average value of the chromatic value as the printing sample
The chromatic value opened；
The measurement point of 10~30 is chosen on the print sample with densitometer, in 5~10cm at the distance between adjacent 2 points
Between, measure the density value of primary colors on the print sample.
4. the ink control method of printed matter according to claim 1, it is characterised in that opening relationships according to the following equation
Model：
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) represents the chromatic value of L * channel, and y (a) represents the chromatic value of a passages, and y (b) represents the chromatic value of b passages；ki,
mi, PiIt is fitting coefficient, wherein, i is 1 to n integer；X represents density value.
5. the ink control method of printed matter according to claim 4, it is characterised in that calculate based on minimum aberration most
Good density value includes：
The relation between density value and aberration is determined according to the following equation：
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E represent color difference function, y (L1) and y (L2) respectively represent L * channel two chromatic values, y (a1) and y (a2) respectively
Represent two chromatic values of a passages, y (b1) and y (b2) respectively represent b passages two chromatic values；
Above-mentioned color difference function is differentiated, and calculates corresponding density value when the derivative value of color difference function is 0, and calculating is obtained
Density value be used as the optimum density value.
6. the ink control method of printed matter according to claim 1 or 5, it is characterised in that calculate each candidate
The derivative value of the corresponding color difference function of density value includes：
Each described candidate's density value is substituted into the derivative of the color difference function, and regard result of calculation as candidate each described
The derivative value of the corresponding color difference function of density value.
7. the ink control method of printed matter according to claim 1, it is characterised in that the aberration letter obtained according to calculating
Several derivative values, current quantity of ink is increased or reduce including：
When the derivative value for calculating obtained color difference function is more than 0, current quantity of ink is reduced；
When the derivative value for calculating obtained color difference function is less than 0, by current quantity of ink increase.
8. a kind of ink control apparatus of printed matter, it is characterised in that described device includes：
Print sample acquiring unit, the print sample for obtaining predetermined number；Wherein, the print sample is pressed according to printing
Power, printing-ink type, paper are determined from amount and inking amount；
Colorimetric density information measurement unit, chromatic value and density value for measuring and recording the print sample；
Optimum density value computing unit, for the opening relationships model between the chromatic value and density value that measurement is obtained, and is calculated
Optimum density value based on minimum aberration；
Derivative value computing unit, for according to the optimum density value, at least one candidate to be determined in density value critical field
Density value, and calculate the derivative value of the corresponding color difference function of each described candidate's density value；
Quantity of ink operating unit, for according to the derivative value for calculating obtained color difference function, increasing current quantity of ink
Or reduce.
9. the ink control apparatus of printed matter according to claim 8, it is characterised in that the optimum density value calculates single
First opening relationships model according to the following equation：
Y (L)=k1xn+k2xn-1+k3xn-2+k4xn-3+…….+kn,
Y (a)=m1xn+m2xn-1+m3xn-2+m4xn-3+…….+mn,
Y (b)=P1xn+P2xn-1+P3xn-2+P4xn-3+…….+Pn
Wherein, y (L) represents the chromatic value of L * channel, and y (a) represents the chromatic value of a passages, and y (b) represents the chromatic value of b passages；ki,
mi, PiIt is fitting coefficient, wherein, i is 1 to n integer；X represents density value.
10. the ink control apparatus of printed matter according to claim 9, it is characterised in that the optimum density value is calculated
Unit includes：
Color difference function determining module, for determining the relation between density value and aberration according to the following equation：
△ E={ [y (L1)-y(L2)]2+[y(a1)-y(a2)]2+[y(b1)-y(b2)]2}1/2
Wherein, △ E represent color difference function, y (L1) and y (L2) respectively represent L * channel two chromatic values, y (a1) and y (a2) respectively
Represent two chromatic values of a passages, y (b1) and y (b2) respectively represent b passages two chromatic values；
Extreme value determining module, for being differentiated to above-mentioned color difference function, and calculates corresponding close when the derivative value of color difference function is 0
Angle value, and the density value that calculating is obtained is used as the optimum density value.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108804055A (en) * | 2018-05-18 | 2018-11-13 | 禧图纸品印刷（深圳）有限公司 | Economical printing process, device, terminal and computer readable storage medium based on GRACOL2013 standards |
| CN109706759A (en) * | 2018-12-29 | 2019-05-03 | 杭州智数创联科技有限公司 | A kind of digit printing single channel ink amount method for limiting based on gamut area |
| CN111845098A (en) * | 2019-04-26 | 2020-10-30 | 森大（深圳）技术有限公司 | Method, device, equipment and medium for adjusting ink amount of printer |
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