CN103963453A - Printing grey balance presetting method - Google Patents
Printing grey balance presetting method Download PDFInfo
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- CN103963453A CN103963453A CN201410161600.6A CN201410161600A CN103963453A CN 103963453 A CN103963453 A CN 103963453A CN 201410161600 A CN201410161600 A CN 201410161600A CN 103963453 A CN103963453 A CN 103963453A
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Abstract
The invention provides a printing grey balance presetting method. A standardized printing test method is used for acquiring website expansion data, grey balance data and the like under different material combinations, then, a specific algorithm is used for presetting grey balance through website expansion, and accordingly the grey balance effect of a printing specimen page can better meet the visual characteristic requirement. By means of the printing grey balance presetting method, printing grey balance presetting is high in efficiency, high in precision and short in cycle; the advantages of being simple in structure, low in cost, high in precision and convenient to implement in printing production management are achieved; the printing grey balance presetting method can be applied to printing grey balance presetting in the spray painting field, the printing and dyeing textile field and other fields in an expandable mode.
Description
Technical field
The invention belongs to printing technology, be specially a kind of printing grey balance pre-setting method.
Background technology
Grey balance is the CCP in printing color reproduction process, is to weigh the important indicator that printed matter has or not colour cast.Whether accurately the degree of accuracy that printing grey balance is reproduced will directly affect dot reproduction and the quality of color reproduction image.But because printing environment, plate-making condition, printing machine are unstable and the difference of stock and ink, usually cause grey balance bad and produce colour cast.Therefore,, to different stocks, ink and dot gain, determine that correct gray balance curve is key factor and the printing enterprise bottleneck problem urgently to be resolved hurrily that determines printing quality level in print production.
At present, print preset dot gain control method and the coupling ginseng seal thing chromatmetry of mainly containing of grey balance both at home and abroad.Wherein, dot gain control method realizes grey balance control by CMY dot gain, although can accurately realize the reproduction of CMYK tetra-look sites, can not ensure grey balance accurate reproduction.Coupling ginseng prints thing chromatmetry by the colourity of coupling stock, and using this as grey desired value, exists grey balance to reach requirement, and have the not good problem of institute's copying and printing product stereovision.This method proposes to print grey balance pre-setting method, system control by plate-making with print system stability, solve the deficiency of above-mentioned two kinds of methods, reach all good targets of printing grey balance and gradation reproduction, during actual print is produced, printed high-quality and realize significant and good using value.
Summary of the invention
The present invention is directed to the bottleneck problem existing in the grey balance control of current printing industry, provide a kind of high-quality, print grey balance pre-setting method efficiently, accurately.
The technical solution adopted for the present invention to solve the technical problems comprises the following steps:
Step 1. is set up printing stock database
The stock brand, stock type and the stock colourity that use according to printing enterprise, set up and be called unique retrieval foundation with stock name, the printing stock database taking stock brand, stock type and stock colourity as feature.
Step 2. is set up printing grey balance test mark version
According to the type of the direct platemaking equipment CTP of printing enterprise's all-purpose computer, printing machine type, design and printing grey balance test mark version.This printing test mark version comprises following element: correct gray balance module, IT8.7/4 look target, CMYKGRB site step-wedge, grey balance gradual change step-wedge, alignment cross hairs, printing control strip, subjective testing figure.
Step 3. is set presswork benchmark
According to selected printing stock, printing-ink and printing machine, set presswork benchmark by printing control strip and IT8.7/4 look target, comprising:
3-1. carries out the adjusting of water circuit system, ink system and pressure system according to printing machine maintenance handbook specification, and printing machine is proofreaied and correct;
3-2., according to the General Requirement of CTP process control, calibrates CTP linearisation;
3-3. is not loading under the prerequisite of any printing compensated curve, output printing grey balance test forme;
3-4., according to the General Requirement of printing machine process control, monitors electrical conductivity, pH value and the temperature of printing machine fountain solution.
Printing and the sampling of step 4. grey balance test specimen page
4-1. is according to the requirement of ISO12647-2, printing grey balance test specimen page, test specimen page parameter index reaches following requirement: subjective testing figure tone reproduction is good, normal without dirty point, ink-water balance state, with magnifying glass observation site edge clear, alignment cross hairs registration error be less than 0.02mm, the each ink-covered area of control strip density error in ± 0.05 scope, the chromatic value of CMYKRGB meets the colourity requirement of ISO12647-2;
4-2., when reaching after step 4-1 requirement, republishes 1000 printed sheets and samples 1 at interval of 100;
4-3. again carries out DATA REASONING and the specimen page that meets step 4-1 is defined as to the standard testing specimen page line label of going forward side by side sampling specimen page.
The DATA REASONING of step 5. specimen page and grey balance are calculated
5-1. utilizes general color measuring apparatus, and correct gray balance module in measurement standard test specimen page, carries out the correction of grey balance target according to stock colourity a, b value, and calculates acquisition grey balance curve;
5-2. utilizes general color measuring apparatus, and CMY dot gain step-wedge in measurement standard test specimen page, and dot gain value to define in ISO12647-2, utilize general dot gain curve correcting method to calculate and obtain CMY dot gain calibration curve;
Grey balance curve and CMY dot gain calibration curve that 5-3. obtains according to step 5-1 and 5-2, revise grey balance curve, the final printing grey balance curve that obtains.
Step 6. is set up printing grey balance diagram database
For the different stocks in step 1, repeating step 2 is to step 5, taking stock title and printing condition as feature, sets up the printing grey balance diagram database of different stocks.
Described one printing grey balance pre-setting method, is characterized in that the stock database described in step 1 classifies taking stock brand, stock type, stock colourity as feature.
Described one printing grey balance pre-setting method, is characterized in that the printing grey balance test mark version described in step 2 is a kind of figure that comprises correct gray balance module, IT8.7/4 look target, CMYKGRB site step-wedge, grey balance gradual change step-wedge, alignment cross hairs, printing control strip, subjective testing figure.
Described one printing grey balance pre-setting method, is characterized in that the correction formula of the correct gray balance described in step 5-1 is as follows:
Wherein, the dot percentage of C representative printing cyan.
Described one printing grey balance pre-setting method, is characterized in that the printing grey balance curve described in step 5-3, not only will meet the grey balance standard relevant to stock, also will meet the dot gain requirement defining in ISO12647-2.
Benefit of the present invention and effect are as follows:
(1) the present invention is directed to the problem that current budget grey balance exists, the grey balance Optimization Compensation curve proposing, has improved grey balance playback accuracy greatly, has not only realized the high accuracy control of printing grey balance, meet the requirement that printing net-point expands standard, also effectively promoted the quality of printed matter.
(2) the present invention is directed to the printing grey balance initialized data base that different stocks are set up, solve the key issue in restriction printing quality and the efficiency of management, greatly improve the ability that printing enterprise adapts to different printing environment and prints stock, improve print production efficiency, be conducive to the sustainable development of printing enterprise.
Brief description of the drawings
Fig. 1 is flow chart of the present invention
The ink color standard defining in the ISO12647-2 printing international standard that Fig. 2 is institute of the present invention reference
The dot gain standard defining in the ISO12647-2 printing international standard that Fig. 3 is institute of the present invention reference.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention will be further described:
As shown in Figure 1, Figure 2 and Figure 3, a kind of printing grey balance pre-setting method, comprises the following steps:
Step 1. is set up printing stock database
The stock brand, stock type and the stock colourity that use according to printing enterprise, set up and be called unique retrieval foundation with stock name, the printing stock database taking stock brand, stock type and stock colourity as feature.
Step 2. is set up printing grey balance test mark version
According to the type of the direct platemaking equipment CTP of printing enterprise's all-purpose computer, printing machine type, design and printing grey balance test mark version.This printing test mark version comprises following element: correct gray balance module, IT8.7/4 look target, CMYKGRB site step-wedge, grey balance gradual change step-wedge, alignment cross hairs, printing control strip, subjective testing figure.
Step 3. is set presswork benchmark
According to selected printing stock, printing-ink and printing machine, set presswork benchmark by printing control strip and IT8.7/4 look target, comprising:
3-1. carries out the adjusting of water circuit system, ink system and pressure system according to printing machine maintenance handbook specification, and printing machine is proofreaied and correct;
3-2., according to the General Requirement of CTP process control, calibrates CTP linearisation;
3-3. is not loading under the prerequisite of any printing compensated curve, output printing grey balance test forme;
3-4., according to the General Requirement of printing machine process control, monitors electrical conductivity, pH value and the temperature of printing machine fountain solution.
Printing and the sampling of step 4. grey balance test specimen page
4-1. is according to the requirement of ISO12647-2, printing grey balance test specimen page, test specimen page parameter index reaches following requirement: subjective testing figure tone reproduction is good, normal without dirty point, ink-water balance state, with magnifying glass observation site edge clear, alignment cross hairs registration error be less than 0.02mm, the each ink-covered area of control strip density error in ± 0.05 scope, the chromatic value of CMYKRGB meets the colourity requirement of ISO12647-2;
4-2., when reaching after step 4-1 requirement, republishes 1000 printed sheets and samples 1 at interval of 100;
4-3. again carries out DATA REASONING and the specimen page that meets step 4-1 is defined as to the standard testing specimen page line label of going forward side by side sampling specimen page.
The DATA REASONING of step 5. specimen page and grey balance are calculated
5-1. utilizes general color measuring apparatus, and correct gray balance module in measurement standard test specimen page, carries out the correction of grey balance target according to stock colourity a, b value, and calculates acquisition grey balance curve;
5-2. utilizes general color measuring apparatus, and CMY dot gain step-wedge in measurement standard test specimen page, and dot gain value to define in ISO12647-2, utilize general dot gain curve correcting method to calculate and obtain CMY dot gain calibration curve;
Grey balance curve and CMY dot gain calibration curve that 5-3. obtains according to step 5-1 and 5-2, revise grey balance curve, the final printing grey balance curve that obtains.
Step 6. is set up printing grey balance diagram database
For the different stocks in step 1, repeating step 2 is to step 5, taking stock title and printing condition as feature, sets up the printing grey balance diagram database of different stocks.
Described one printing grey balance pre-setting method, is characterized in that the stock database described in step 1 classifies taking stock brand, stock type, stock colourity as feature.
Described one printing grey balance pre-setting method, is characterized in that the printing grey balance test mark version described in step 2 is a kind of figure that comprises correct gray balance module, IT8.7/4 look target, CMYKGRB site step-wedge, grey balance gradual change step-wedge, alignment cross hairs, printing control strip, subjective testing figure.
Described one printing grey balance pre-setting method, is characterized in that the correction formula of the correct gray balance described in step 5-1 is as follows:
Wherein, the dot percentage of C representative printing cyan.
Described one printing grey balance pre-setting method, is characterized in that the printing grey balance curve described in step 5-3, not only will meet the grey balance standard relevant to stock, also will meet the dot gain requirement defining in ISO12647-2.
The present invention has overcome that the preset technology cycle of traditional grey balance is long, cost is high and a difficult problem for repeatable difference, on the basis of CTP forme-producing system and the printer system process process of establishing hierarchy of control and correction, by adopting standardization mode of printing to obtain standard testing specimen page, measurement data is also calculated the grey balance compensated curve generating, realize one-step print and can obtain grey balance data accurately, greatly improved the production efficiency of printing enterprise.
The present invention carries out correct gray balance by stock colourity, can effectively mate the visual characteristic of human eye, makes different stocks can print out the printed matter that visual effect is suitable, and printing quality control is had to positive meaning.Meanwhile, the method can promote the use of the field such as spray-drawing, dyeing textile, and applicability and social value are high.
Claims (5)
1. a printing grey balance pre-setting method, is characterized in that, the method specifically comprises the following steps:
Step 1: set up printing stock database
The stock brand, stock type and the stock colourity that use according to printing enterprise, set up and be called unique retrieval foundation with stock name, the printing stock database taking stock brand, stock type and stock colourity as feature;
Step 2: set up printing grey balance test mark version
According to the type of the direct platemaking equipment CTP of printing enterprise's all-purpose computer, printing machine type, design and printing grey balance test mark version;
This printing test mark version comprises following element: correct gray balance module, IT8.7/4 look target, CMYKGRB site step-wedge, grey balance gradual change step-wedge, alignment cross hairs, printing control strip, subjective testing figure;
Step 3. is set presswork benchmark
According to selected printing stock, printing-ink and printing machine, set presswork benchmark by printing control strip and IT8.7/4 look target, comprising:
3-1. carries out the adjusting of water circuit system, ink system and pressure system according to printing machine maintenance handbook specification, and printing machine is proofreaied and correct;
3-2., according to the General Requirement of CTP process control, calibrates CTP linearisation;
3-3. is not loading under the prerequisite of any printing compensated curve, output printing grey balance test forme;
3-4., according to the General Requirement of printing machine process control, monitors electrical conductivity, pH value and the temperature of printing machine fountain solution;
Printing and the sampling of step 4. grey balance test specimen page
4-1. is according to the requirement of ISO12647-2, printing grey balance test specimen page, test specimen page parameter index reaches following requirement: subjective testing figure is normal without dirty point, ink-water balance state, with magnifying glass observe site edge clear, alignment cross hairs registration error be less than 0.02mm, the each ink-covered area of control strip density error in ± 0.05 scope, the chromatic value of CMYKRGB meets the colourity requirement of ISO12647-2;
4-2., when reaching after step 4-1 requirement, republishes 1000 printed sheets and samples 1 at interval of 100;
4-3. again carries out DATA REASONING and the specimen page that meets step 4-1 is defined as to the standard testing specimen page line label of going forward side by side sampling specimen page;
The DATA REASONING of step 5. specimen page and grey balance are calculated
5-1. utilizes general color measuring apparatus, and correct gray balance module in measurement standard test specimen page, carries out the correction of grey balance target according to stock colourity a, b value, and calculates acquisition grey balance curve;
5-2. utilizes general color measuring apparatus, and CMY dot gain step-wedge in measurement standard test specimen page, and dot gain value to define in ISO12647-2, utilize general dot gain curve correcting method to calculate and obtain CMY dot gain calibration curve;
Grey balance curve and CMY dot gain calibration curve that 5-3. obtains according to step 5-1 and 5-2, revise grey balance curve, the final printing grey balance curve that obtains;
Step 6. is set up printing grey balance diagram database
For the different stocks in step 1, repeating step 2 is to step 5, taking stock title and printing condition as feature, sets up the printing grey balance diagram database of different stocks.
2. a kind of printing grey balance pre-setting method as claimed in claim 1, is characterized in that: the stock database described in step 1 is classified taking stock brand, stock type, stock colourity as feature.
3. a kind of printing grey balance pre-setting method as claimed in claim 1, is characterized in that the printing grey balance test mark version described in step 2 is a kind of figure that comprises correct gray balance module, IT8.7/4 look target, CMYKGRB site step-wedge, grey balance gradual change step-wedge, alignment cross hairs, printing control strip, subjective testing figure.
4. a kind of printing grey balance pre-setting method as claimed in claim 1, is characterized in that the correction formula of the correct gray balance described in step 5-1 is as follows:
Wherein, the dot percentage of C representative printing cyan.
5. a kind of printing grey balance pre-setting method as claimed in claim 1, is characterized in that the printing grey balance curve described in step 5-3, not only will meet the grey balance standard relevant to stock, also will meet the dot gain requirement defining in ISO12647-2.
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| CN201410161600.6A CN103963453B (en) | 2014-04-21 | 2014-04-21 | A kind of printing grey balance pre-setting method |
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| CN109270089A (en) * | 2018-10-31 | 2019-01-25 | 杭州智数创联科技有限公司 | A kind of method of quick obtaining halftone paper printing dot gain |
| CN113553012A (en) * | 2021-07-01 | 2021-10-26 | 杭州宏华数码科技股份有限公司 | System and method for adjusting consistency of output effect of multi-channel printing equipment |
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| CN103963453B (en) | 2016-07-06 |
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