CN108357225A - A kind of determination method of the best field density of printed matter - Google Patents
A kind of determination method of the best field density of printed matter Download PDFInfo
- Publication number
- CN108357225A CN108357225A CN201810078876.6A CN201810078876A CN108357225A CN 108357225 A CN108357225 A CN 108357225A CN 201810078876 A CN201810078876 A CN 201810078876A CN 108357225 A CN108357225 A CN 108357225A
- Authority
- CN
- China
- Prior art keywords
- field density
- dot gain
- relative contrast
- value
- dot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/14—Multicolour printing
Landscapes
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Color Image Communication Systems (AREA)
Abstract
The invention discloses a kind of determination methods of the best field density of printed matter, design four color step-wedges, obtain transferring specimen page；The field density of every specimen page, density at 75% dot area, the practical dot area at 50% are measured, relative contrast and dot gain are calculated；Establish relative contrast, dot gain and field density relationship mathematical model；The functional relation of dot gain and field density when finding relative contrast maximum later；Dot gain in 15% 20% range of national standard, using with the field density corresponding to the immediate one group of data of this function as best field density.The method of the present invention can ensure that relative contrast is good in the best field density of determination, and dot gain is suitable, realize that printed matter level is fine and smooth, bright-colored.
Description
Technical field
The invention belongs to the fields of print quality control, and in particular to a kind of determination side of the best field density of printed matter
Method.
Background technology
Field density is quality control index important in printing technology, and field density control error will result directly in other
Abnormal parameters, printing quality go wrong, it is thus determined that best field density has vital work to print quality
With.For a kind of given paper, ink combination, sixty-four dollar question is to determine that great printing ink quantity is most rational, passes
The method of system is to obtain the different printed sheet of the mass colour depth by adjusting output ink quantity size when printing, detect on different printed sheets
Relative contrast, with the density of the maximum printed sheet of relative contrast for best field density.But in the best field density of determination, I
The problem of considering only relative contrast be insufficient, in actual production process, determined on the spot using relative contrast
Also to ensure dot gain in a certain range while density.Therefore need to consider printing when evaluation print quality instead
Difference and contrast restore the two aspects so that printing can ensure that relative contrast is good simultaneously, and dot gain is suitable, improve printing
Clarity, tint hierarchy and the bright-coloured degree of product have prodigious directive significance to the quality control of printing.
Invention content
The purpose of the present invention is to propose to a kind of determination method of the best field density of printed matter, this method can consider
To factor of both print contrast and contrast reduction.
The technical solution adopted in the present invention is a kind of determination method of the best field density of printed matter, including following step
Suddenly：
Step 1：Design color step-wedge specimen page, dot area design at certain intervals from 0% to 100%；
Step 2：During the entire process of starting to be printed onto and being finally reached ink-water balance, it is spaced decimated pressing, and survey
Measure the field density X of the transferring specimen page extractedj, density at 75% dot area, the practical dot area at 50% dot area,
Relative contrast value and dot gain value are calculated according to measured value；
Step 3：According to the field density measured value X of transferring specimen pagej, relative contrast value and dot gain value, establish opposite
The mathematical model of contrast, dot gain and field density：
Z=Z0+aX+bY+cX2+dY2+fXY
Wherein Z, X, Y are relative contrast value, solid density and dot gain value respectively；Z0, a, b, c, d and f be function
The coefficient of relationship；
Step 4：Relative contrast maximum dot gain and the functional relation of field density are determined by the mathematical model：
Step 5：Dot gain is each when using functional relation calculating relative contrast maximum within the scope of 15%-20%
Field density calculated value X corresponding to dot gain valuei, calculate field density measured value and field density calculated value XiDifference
Absolute value delta X；In the result of calculation of each site, corresponding field density measured value is as best when selecting Δ X closest to 0
Field density.
Further, the step-wedge specimen page described in step 1, dot area are set from 0% to 100% by interval of 3%-10%
Meter.
Further, the decimated pressing in interval described in step 2 is at interval of one transferring specimen page of 30-50 extractions.
Further, the method that the mathematical model of relative contrast, dot gain and field density is established described in step 3 is：
The field density measured value X for the transferring specimen page that step 2 is determinedj, relative contrast value and dot gain value, be depicted as three-dimensional coordinate
Figure, wherein field density are X-axis, and dot gain is Y-axis, and relative contrast is Z axis；It is true using least square method, fitting of a polynomial
The functional relation for determining field density, relative contrast and dot gain establishes the mathematics of relative contrast, dot gain and field density
Model.
Further, the color is any color in Huang Y, product M, blueness C, black BK.
The advantageous effect of the determination method of the best field density of printed matter of the present invention is, in the best field density of determination
It can ensure that relative contrast is good simultaneously, dot gain is suitable, realizes that printed matter level is fine and smooth, bright-colored, to the matter of printing
Amount control has prodigious directive significance.
Description of the drawings
Fig. 1 is the K-Ds relation curves simulated in conventional method；Wherein K is printed matter relative contrast；Ds be close on the spot
Degree.
Fig. 2 is K-Ds, the Δ dot three-dimensional coordinate figures for the magenta ink M that the present invention is drawn；Wherein Δ dot is dot gain
Value；
Fig. 3 is K-Ds, the Δ dot three-dimensional coordinate figures for the green ink C that the present invention is drawn；Wherein Δ dot is dot gain value.
Specific implementation mode
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The determination method of the best field density of printed matter of the present invention, suitable for determining any face Huang Y, product M, blueness C, black BK
The best field density of color, is specifically implemented according to the following steps：
Step 1：Design color step-wedge specimen page：
Huang Y, product M, blueness C, black BK color lumps are made from 0% to 100% according to the step-wedge specimen page that 3%-10% is interval.Later
In temperature it is 20 ± 2 DEG C with offset press, relative humidity is printed in the environment of 35%-60%, and printing color-sequential is BK,
C, M, Y；Screen frequency is 133-200 lines/inch；The pressure of printing is 8-18；Print speed printing speed 5000-8000/per hour；
Printable fabric selects quantification of 70g/m2~200g/m2Paper.
Step 2：Decimated pressing and measurement data：
During the entire process of starting to be printed onto and being finally reached ink-water balance, a transferring specimen page is extracted every 30-50,
The field density of the specimen page of the extraction of spectrophotometer measurement every, density at 75% dot area is used in combination, at 50% dot area
Practical dot area, relative contrast value and dot gain value are calculated according to measured value.
Relative contrast K：Weigh the important indicator of printing image shadow reserving degree.Reflection printing field density and site increase
Inner link between big, and weigh an important parameter of printed matter level.Relative contrast is described with following formula：
Wherein, DtFor the density in 75% region；DsFor field density (i.e. field density measured value Xj).K-Ds relationships such as Fig. 1
It is shown.
Dot gain value refers to the real area coverage rate of site on stock and the site real area of printing plate corresponding position
The difference of coverage rate, it influences the contrast reduction of printing.In printing process, dot gain deformation is inevitable, and site increases
Density is set at image shadow to rise overally slight level loss greater than conference, and bloom is partly because site very little, inking amount are few
Tone variations are less apparent, to make image entirety contrast be widened, affect the reproduction of image entirety contrast.So printing
During brush, by dot gain control in the range of allowing increase.
Step 3：Establish the mathematical model of relative contrast, dot gain and field density：
The field density, relative contrast and the dot gain value that are determined in step 2 are depicted as in Origin mathematical softwares
Three-dimensional coordinate figure, wherein field density are X-axis, and dot gain is Y-axis, and relative contrast is Z axis.Utilize least square method multinomial
Fitting determine field density, relative contrast and dot gain functional relation, establish relative contrast K, dot gain with it is close on the spot
The mathematical model of degree relationship：
Z=Z0+aX+bY+cX2+dY2+fXY
Wherein Z, X, Y are relative contrast, field density and dot gain respectively；Z0, a, b, c, d and f be functional relation
Coefficient.
Four kinds of colors respectively correspond to mathematical model, and form is consistent, but coefficient is different.
Step 4：The functional relation of dot gain and field density when determining relative contrast maximum：
Using the mathematical model obtained in step 3, the function of dot gain and field density when finding relative contrast K maximums
Relationship.The specific steps are：
Derivation is carried out to Z, X：
Z '=a+2cX+fY
Z '=0 is enabled, Z axis slope is that 0, Z values are maximum at this time, is obtained：
A+2cX+fY=0
It is hereby achieved that when relative contrast maximum field density and dot gain functional relation：
Similarly, four kinds of colors respectively correspond to functional relation as above, and form is consistent, but coefficient is different.
Step 5：Determine best field density：
For any color, dot gain is closed in national standard range 15%-20% using the function of above-mentioned corresponding color
System calculates the field density calculated value X corresponding to each dot gain valuei, it is X to define former field density measured valuej, calculate close on the spot
Spend measured value XjWith field density calculated value XiAbsolute value of the difference：
Δ X=| Xj-Xi|
When Δ X is close to 0, corresponding measurement field density is determined as the best field density of the color.
Embodiment 1
Example is now determined as with the best field density of pinkish red M ink, blueness C ink, specifically the method for the bright present invention
With operating process.
Step 1：Magenta M, blueness C color lumps are made from 0% to 100% with 5% for interval 21 grades of step-wedge specimen pages.Use Heidelberg
Offset press is 20 DEG C in temperature, and relative humidity is printed in the environment of 38%, and printing color-sequential is BK, C, M, Y；Screening
Line number is 175 lines/inch；The pressure of printing is 13；Print speed printing speed 6000 opens/per hour；Printable fabric is 157g/m2Copper
Millboard.
Step 2：During the entire process of starting to be printed onto and being finally reached ink-water balance, extracts one every 40 and opened pressing
, 27 transferring specimen pages are extracted altogether, and the field density of every specimen page of spectrophotometer measurement, close at 75% dot area is used in combination
Practical dot area at degree, 50% dot area calculates relative contrast K and dot gain according to measured value.
Step 3：Step 2 data are depicted as three-dimensional coordinate figure, as shown in Figure 2 and Figure 3, X-axis is field density in figure；Y-axis
For dot gain；Z axis is relative contrast (1/100).Establish relative contrast K, dot gain and field density relationship mathematical modulo
Type：
M ink:Z=14.45418+46.4364X-0.42964Y-22.39096X2-0.08155Y2+1.87907XY
C ink:Z=44.8186-58.348X+5.78055Y+59.6199X2+0.18698Y2-7.6987XY
Step 4：Obtain the functional relation of dot gain and field density when relative contrast K maximums：
M ink：X=0.04196046Y+1.0369408
C ink：X=0.06456485Y+0.48933326
Step 5：In the transferring specimen page of extraction, transferring specimen page of the dot gain in national standard range 15%-20% is selected,
M, C is respectively 5 groups of data, and calculating the field density corresponding to each dot gain value using functional relation obtained above calculates
Value：
M ink：Xi=(1.709,1.752,1.855,1.878,1.927)
C ink：Xi=(1.361,1.513,1.547,1.556,1.598)
Former field density measured value is：
M ink：Xj=(1.523,1.612,1.694,1.784,1.823)
C ink：Xj=(1.444,1.551,1.649,1.701,1.787)
Calculate the absolute value of the difference of field density calculated value and measured value：
M ink：Δ X=| Xj-Xi|=(0.186,0.140,0.161,0.094,0.104)
C ink：Δ X=| Xj-Xi|=(0.083,0.038,0.102,0.145,0.189)
It follows that magenta M, blueness C ink solids density absolute value of the difference minimums are respectively 0.094,0.038, institute is right
The measurement field density answered is respectively 1.784,1.551, and therefore, the best field density of pinkish red M ink is determined as 1.784, green C
The best field density of ink is determined as 1.551.
Claims (5)
1. a kind of determination method of the best field density of printed matter, which is characterized in that include the following steps：
Step 1：Design color step-wedge specimen page, dot area design at certain intervals from 0% to 100%；
Step 2：During the entire process of starting to be printed onto and being finally reached ink-water balance, it is spaced decimated pressing, and measure pumping
The field density X of the transferring specimen page takenj, density at 75% dot area, the practical dot area at 50% dot area, according to
Measured value calculates relative contrast value and dot gain value；
Step 3：According to the field density measured value X of transferring specimen pagej, relative contrast value and dot gain value, establish relative contrast,
The mathematical model of dot gain and field density：
Z=Z0+aX+bY+cX2+dY2+fXY
Wherein Z, X, Y are relative contrast value, solid density and dot gain value respectively；Z0, a, b, c, d and f be functional relation
Coefficient；
Step 4：Relative contrast maximum dot gain and the functional relation of field density are determined by the mathematical model：
Step 5：Dot gain is within the scope of 15%-20%, each site when using functional relation calculating relative contrast maximum
Field density calculated value X corresponding to expansion valuei, calculate field density measured value and field density calculated value XiDifference it is absolute
It is worth Δ X；In the result of calculation of each site, corresponding field density measured value is as best reality when selecting Δ X closest to 0
Ground density.
2. the determination method of the best field density of printed matter according to claim 1, which is characterized in that described in step 1
Step-wedge specimen page, dot area is from 0% to 100% using 3%-10% as spaced design.
3. the determination method of the best field density of printed matter according to claim 1, which is characterized in that between described in step 2
Every decimated pressing at interval of one transferring specimen page of 30-50 extractions.
4. the determination method of the best field density of printed matter according to claim 1, which is characterized in that built described in step 3
The method of the mathematical model of vertical relative contrast, dot gain and field density is：The transferring specimen page that step 2 is determined it is close on the spot
Spend measured value Xj, relative contrast value and dot gain value, be depicted as three-dimensional coordinate figure, wherein field density is X-axis, dot gain
For Y-axis, relative contrast is Z axis；Field density, relative contrast and dot gain are determined using least square method, fitting of a polynomial
Functional relation, establish the mathematical model of relative contrast, dot gain and field density.
5. the determination method of the best field density of printed matter according to claim 1, which is characterized in that the color is Huang
Y, any color in product M, blueness C, black BK.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810078876.6A CN108357225B (en) | 2018-01-26 | 2018-01-26 | A kind of determination method of the best field density of printed matter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810078876.6A CN108357225B (en) | 2018-01-26 | 2018-01-26 | A kind of determination method of the best field density of printed matter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108357225A true CN108357225A (en) | 2018-08-03 |
| CN108357225B CN108357225B (en) | 2019-11-26 |
Family
ID=63007078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810078876.6A Active CN108357225B (en) | 2018-01-26 | 2018-01-26 | A kind of determination method of the best field density of printed matter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108357225B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110722889A (en) * | 2019-11-19 | 2020-01-24 | 东莞市美盈森环保科技有限公司 | Color control method for ultrahigh fine printing of image |
| CN114987076A (en) * | 2021-05-11 | 2022-09-02 | 广东新宏泽包装股份有限公司 | Method for determining optimal solid density of four colors in printing |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001353851A (en) * | 2000-06-14 | 2001-12-25 | Toppan Printing Co Ltd | Method for calculating dot percent, control strip, printing method, and printed matter |
| CN101518980A (en) * | 2008-12-30 | 2009-09-02 | 武汉大学 | Printing color quality detecting method of integrating visual measurement, density measurement and color measurement |
| US8094869B2 (en) * | 2001-07-02 | 2012-01-10 | Digimarc Corporation | Fragile and emerging digital watermarks |
| CN103057289A (en) * | 2013-01-12 | 2013-04-24 | 云南省印刷技术研究所 | High-precision offset printing method |
| CN103714245A (en) * | 2013-12-19 | 2014-04-09 | 杭州电子科技大学 | Method for obtaining optimal solid density for coated paper printing |
| CN104339838A (en) * | 2014-10-08 | 2015-02-11 | 中山火炬职业技术学院 | Printing quality evaluation and process control method |
| CN104949626A (en) * | 2015-06-09 | 2015-09-30 | 河南省新斗彩印刷有限公司 | Offset printing plate dot reduction density measuring method |
-
2018
- 2018-01-26 CN CN201810078876.6A patent/CN108357225B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001353851A (en) * | 2000-06-14 | 2001-12-25 | Toppan Printing Co Ltd | Method for calculating dot percent, control strip, printing method, and printed matter |
| US8094869B2 (en) * | 2001-07-02 | 2012-01-10 | Digimarc Corporation | Fragile and emerging digital watermarks |
| CN101518980A (en) * | 2008-12-30 | 2009-09-02 | 武汉大学 | Printing color quality detecting method of integrating visual measurement, density measurement and color measurement |
| CN103057289A (en) * | 2013-01-12 | 2013-04-24 | 云南省印刷技术研究所 | High-precision offset printing method |
| CN103714245A (en) * | 2013-12-19 | 2014-04-09 | 杭州电子科技大学 | Method for obtaining optimal solid density for coated paper printing |
| CN104339838A (en) * | 2014-10-08 | 2015-02-11 | 中山火炬职业技术学院 | Printing quality evaluation and process control method |
| CN104949626A (en) * | 2015-06-09 | 2015-09-30 | 河南省新斗彩印刷有限公司 | Offset printing plate dot reduction density measuring method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110722889A (en) * | 2019-11-19 | 2020-01-24 | 东莞市美盈森环保科技有限公司 | Color control method for ultrahigh fine printing of image |
| CN114987076A (en) * | 2021-05-11 | 2022-09-02 | 广东新宏泽包装股份有限公司 | Method for determining optimal solid density of four colors in printing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108357225B (en) | 2019-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104660863B (en) | A kind of digital sample printing device color bearing calibration | |
| CA1216943A (en) | Process and apparatus for evaluating printing quality and for regulating the ink feed controls in an offset printing machine | |
| CN100589521C (en) | Method for printing and outputting L*a*b* image with high fidelity | |
| CN106585090B (en) | A kind of detection and bearing calibration of Dot Area increment value | |
| CN111267467B (en) | Offset printing standard test plate and production and application method thereof | |
| CN108357225B (en) | A kind of determination method of the best field density of printed matter | |
| CN102029783B (en) | Method and device for determining register deviations through recursion analysis | |
| JPS60176765A (en) | Method and device for evaluating quality of printing and controlling supply of ink | |
| CN104034424A (en) | Method for detecting and analyzing printing quality of decorative paper | |
| CN103057289B (en) | A kind of fine offset printing method | |
| CN106541702A (en) | A kind of printing quality corrects system and method | |
| CN105716995B (en) | A method of determining best printing density | |
| CN107796773A (en) | A kind of control method of intaglio printing spot color half tone image quality | |
| CN104742516A (en) | High-power image dot coverage rate digital measuring method suitable for whole printing process | |
| CN102238297B (en) | Method and system for generating international color consortium profile file | |
| CN112537148A (en) | Method for matching colors of digital printing and flexography | |
| CN107650508B (en) | A kind of machine vision method of offset printing process control | |
| CN104339840B (en) | Test the automatic predetermined of color value | |
| CN103079027B (en) | Color simulation method for digital proofing | |
| CN109992928A (en) | A method of establishing china picture-character paper output quality prediction model | |
| Durnyak et al. | Determination of the Optical Density of Two-Parameter Tone Transfer for a Short Printing System of the Sixth Dimension. | |
| CN111806088A (en) | Method for manufacturing flexible preprinting measurement and control strip of wide-width color corrugated carton and measurement and control strip | |
| CN102161258B (en) | Method for analysis of color separations | |
| Varepo et al. | Method of calculation volume of the color gamut body | |
| CN103978783A (en) | Control method for static digital printing dot halftone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |