CN100572063C - Ink pre-setting method based on JDF digitlization flow process - Google Patents
Ink pre-setting method based on JDF digitlization flow process Download PDFInfo
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Abstract
A kind of ink pre-setting method disclosed by the invention based on JDF digitlization flow process, at first according to 1-bit tiff image layout file and printer characteristics file after the RIP rasterization process through generating after the layout, extract the dot area percentage of each ink-covered area, by the right processing of experiment sample data to collecting, obtain the mass colour transfer curve, generate the ink pre-setting data of corresponding each ink-covered area then, each the ink-covered area ink pre-setting data that generates are saved as the JDF file, supply has the printing machine of CIP4 ink information interface, perhaps save as the Txt file, supply does not have the printing machine of CIP4 ink information interface, be used for the pre-adjustment of ink key of printer, realize ink pre-setting.Adopt the inventive method, not only can realize presetting of each ink-covered area printing ink of printing machine fast, the accuracy of ink pre-setting is good, and shortens the available machine time, reduces the wastage that start is preprinted, and improves the quality of printed matter.
Description
Technical field
The invention belongs to printing technology, relate to a kind of method of ink key of printer pre-adjustment, be specifically related to a kind of ink pre-setting method based on JDF digitlization flow process.
Background technology
In order to guarantee the quality of printed matter, formal start is in batches before the printing, needs according to drawing a design specimen page, and the black key folding degree of each ink knife of printing machine is carried out pre-adjustment, promptly carries out ink pre-setting.
Traditional printing normally relies on experienced leader, and specimen page is analyzed the color of layout characteristics according to drawing a design, regulate and control the black key of printing machine in advance, then, by the difference of the actual specimen page of observing relatively examination printing and the specimen page of drawing a design, the black key of printing machine is repeatedly adjusted and revised.This mode, the subjective sensation and the experience that rely on the board operating personnel are fully adjusted ink key of printer, cause printing machine to start to print collating time longer, waste time and energy, it is inaccurate not only to print mass colour, cause the waste of materials such as paper, printing ink, and, because the factors such as difference of peopleware and printer hardware cause printing accent machine cost to rise, the printing quality instability is difficult to guarantee the quality of print product.
The forme scan method is to shine good forme, to produce ink information through overscanning, and this information is sent to the printing machine console, and then adjusts and finish presetting of Mo Jian.But this method complicated operation, lose time, invest big, especially use the forme scanner to generate the process of black key information, the working time is long, is unsuitable for the production model of modern printing heavy duty detergent.
Along with the development of printing technology, printing machine develops to high speed, automation, digitized direction, and printing process is also progressively being realized totally digitilized flow process.
At present, more domestic large-sized print enterprises have successively introduced external various ink pre-setting system, for example, and the QuickMaker ink pre-setting system that Shanghai Wen Hui new people journalism group uses at seal affair center based on the CIP4 technology; When Printing Factory, The People's Daily introduces graceful rowland UNISET75 printing machine, the autonomous CIP3 ink pre-setting system that is equipped with etc.Obtained good effect after these ink pre-setting systems come into operation, but also existed the printing machine data-interface not general, the data derivation ability of system is restricted before the seal, does not still have the defective that the printing machine of CIP ink pre-setting interface capability can't use.
Summary of the invention
The purpose of this invention is to provide a kind of ink pre-setting method based on JDF digitlization flow process, the ink pre-setting information that obtains is not subjected to the influence of data-interface, this ink pre-setting information can be the Txt file, mode with figure intuitively shows, offering the printing machine with CIP ink pre-setting interface capability uses, also can be the JDF file, directly be transferred to printing machine and use with CIP ink pre-setting interface capability.
The technical solution adopted in the present invention is, a kind of ink pre-setting method based on JDF digitlization flow process carries out according to the following steps:
Step 1: the tag file that generates printing machine
Printing machine equipment information is generated the tag file of this printing machine, this tag file comprises printing machine model, print speed printing speed, ink roller radius, ink-covered area integral width, ink-covered area number and transfer curve rectification parameter, and with of the form preservation of above-mentioned tag file with XML document
Step 2: the experimental data of the standard specimen page of the normal printing of acquisition step 1 described printing machine, this experimental data is made up of the dot area percentage and the ink knife opening value of different printing look;
Step 3:, set up the mass colour transfer curve of this printing machine according to the experimental data that step 2 is gathered
All data edits that step 2 is collected then, to the data processing of classifying, are set up the mass colour transfer curve of this printing machine;
Step 4: the dot area percentage that obtains each ink-covered area correspondence of product to be printed
By seal front port or software, obtain after the product layout to be printed through the 1-bit of RIPization tiff image file, the printer characteristics file that obtains according to this 1-bit tiff image file layout information and step 1 obtains the pairing dot area percentage in each ink-covered area of product to be printed then;
Step 5: the ink knife opening value of determining each ink-covered area dot area percentage correspondence
Each ink-covered area dot area percentage of the product to be printed that generate according to step 4, on the mass colour transfer curve that step 3 is set up, search and definite ink knife opening value corresponding with each ink-covered area dot area percentage, this ink knife opening value is the ink pre-setting value of printing machine, and this ink pre-setting value is saved as JDF file or Txt file;
Step 6: printing machine is carried out ink pre-setting
The JDF file that comprises the ink pre-setting data that step 5 is obtained is sent to the console of the printing machine with CIP ink pre-setting interface function through network or other storage mediums, automatically preset the black key of this printing machine, the printing machine that does not possess CIP ink pre-setting interface function, by the demonstration of printing machine operating personnel, manually preset the black key of printing board according to the Txt file that comprises the ink pre-setting data;
Step 7: the black key that presets is adjusted
According to the ink in printing press information that step 6 presets, try printing, according to the quality of print sample, black key to printing machine carries out trickle adjustment, until printing out the satisfactory specimen page of quality, record black key assignments at this moment, the printing ink OK value that this China ink key assignments is a printing machine;
Step 8: correct the mass colour transfer curve
The printing ink preset value that obtains according to step 5 and the printing ink OK value of step 7 compare, and correct the mass colour transfer curve, make it consistent with the actual preset value of printing machine ink fountain;
Step 9: use the foundation that the mass colour transfer curve after the step corrects presets as next mass colour.
Beneficial effect of the present invention:
1. provide a kind of quicker ink pre-setting method for the middle-size and small-size printing enterprise that uses conventional method.
2. be the large enterprise of the external ink pre-setting of introduction system, solve the preceding data message interface problem of seal, improve the sharing and the reusability of digital information, make the printing machine that does not possess the CIP4 information interface enjoy the digitlization advantage of time-saving and efficiency equally.
3. shorten and print time, reduce supplies consumption, reduce printing cost, improve printing efficiency and printing quality.
Description of drawings
Fig. 1 is the flow chart of the inventive method;
Fig. 2 is the flow chart of a kind of embodiment of the inventive method;
Fig. 3 is the printing machine black ink mass colour curve foundation figure of a kind of embodiment of the inventive method; Wherein, a is the black curve map of putting of original experimental data generation, and b is the black curve map of putting that quadratic polynomial fits the method generation;
Fig. 4 is space of a whole page picture traverse and printing machine ink sector width corresponding relation figure.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
The flow process of the inventive method as shown in Figure 1.At first, generate the tag file of printing machine, and preserve with the form of XML document with printing machine equipment information input computer; To printing machine repeatedly the information of the standard specimen page of high quality printing gather, handle by data, set up the mass colour transfer curve (be also referred to as and put black curve) of this printing machine; According to piecing together 1-bit tiff image file layout information and the printer characteristics file that big version back generates, extract the pairing dot area percentage in each ink-covered area then; According to each ink-covered area dot area percentage and mass colour transfer curve, generate each ink-covered area initialize data, save as the JDF file, offer printing machine, or save as the TXT file with CIP4 ink information interface, offer the printing machine that does not have CIP4 ink information interface; Be used for the pre-adjustment of ink key of printer; Through the examination printing,
The flow process of a kind of embodiment of the inventive method as shown in Figure 2, specifically may further comprise the steps:
Step 1: the tag file that generates printing machine
With printing machine equipment information input computer, form the tag file of this printing machine, this tag file comprises printing machine model, print speed printing speed, ink roller radius, ink-covered area integral width, ink-covered area number and transfer curve rectification parameter, and preserves with the form of XML document;
For example, the printing machine model is KBA Comet75, print speed printing speed 7500rad/s, and ink roller radius 70mm, ink-covered area integral width 890mm, the ink-covered area number is 21, it is 0.78 that transfer curve is corrected parameter.
Step 2: the experimental data of the standard specimen page of the normal printing of acquisition step 1 described printing machine;
A large amount of experimental datas of collecting the described printing machine of step 1, this experimental data is made up of the dot area percentage and the ink knife opening value of the different printing look of printing machine.
As for top example, below be the dot area percentage and the corresponding ink knife opening value of a space of a whole page of a print product of this printing machine of gathering,
20070321_01_2
0，0，11.1，19.3，21.3，13.0，18.3，14.6，14.8，11.8，0，15.0，18.4，21.5，28.8，26.7，27.6，23.7，12.1，0，00?0?21?28?29?28?27?25?25?22?0?24?26?27?30?30?30?28?22?0?0
0，0，12.0，11.2，12.9，12.3，21.6，21.2，14.0，20.3，0，9.5，10.4，16.1，21.4，28.1，31.5，32.5，20.7，0，00?0?23?22?25?24?31?31?26?31?0?19?20?27?30?32?35?36?29?0?0
0，0，4.3，5.9，5.3，6.5，12.5，9.7，4.5，0.4，0，19.4，21.8，27.0，24.4，19.4，19.5，20.1，12.9，0，00?0?14?16?15?16?22?19?14?18?0?30?31?34?32?30?30?30?24?0?0
0，0，5.5，8.8，13.5，15.4，19.2，14.3，8.8，10.1，0，19.3，22.7，27.8，28.3，22.9，26.1，29.0，15.6，0，00?0?23?24?26?27?29?26?24?25?0?33?35?39?39?36?38?39?31?0?0
Wherein, on the working day of " 20070321 " expression printing, promptly the date of printing of this printed matter is on March 21st, 2007, and " 01_2 " then represents concrete galley this shop; Forms version of the same colour by staggered data of two row up and down, previous column is " an ink-covered area dot area percentage ", and adjacent next classified " the ink knife opening value " of correspondence as, shows 4 look versions altogether.
Step 3:, set up the mass colour transfer curve according to the experimental data that step 2 is gathered;
All experimental data edits that step 2 is collected, then, to these data carry out matrix vectorization, data sort ascending, reject identical data, quadratic polynomial curve fit, interpolation, data smoothing and preserve comprehensive, obtain the mass colour transfer curve of this printing machine, be also referred to as and put black curve, this mass colour transfer curve can be used for later printing.
The concrete processing method of data is:
1) dot area percentage and the ink knife opening value of the resulting process color of step 2 are formed matrix data, carry out vector quantization, promptly form a matrix vector that contains 2 row.The dot area percentage of the 1st each ink-covered area of line display wherein, the corresponding ink knife opening value of the 2nd line display,
2) will go up the step 1) middle 2 matrix vectors of going that form, be foundation with the 1st dot area percentage of going, adopt the method for bubble sort to carry out the ascending order arrangement, the data of the 2nd row are adjusted accordingly with the 1st data of going,
3) will go up the step 2) middle 2 matrix vectors of going that form, be foundation with the 1st dot area percentage of going, for identical data, only keep wherein one group, weed out other identical data rows,
4) the mass colour transfer curve can be approximated to be a quadratic polynomial curve, the step 3 in the utilization) the middle 2 row matrix vectors that form, adopt least square method to ask for the coefficient of this quadratic polynomial,
The coefficient and the corresponding quadratic polynomial of the quadratic polynomial of trying to achieve the 5) step 4 in the utilization) are unit with dot area percentage from 0 to 100 every interval 1, ask for corresponding ink knife opening value,
6) to the last step 5) in the pairing ink knife opening value of each dot area percentage of trying to achieve, carry out at 3 and ask average smoothing processing,, be saved in the form as final ink knife opening value, promptly the mass colour transfer curve of Xing Chenging is that form with data is stored in the form, is provided with using when the back is set.
As shown in Figure 3, be the black mass colour transfer curve of printing machine described in the previous example, the mass colour transfer curve of other look version is identical with the method for building up of black mass colour transfer curve.The mass colour transfer curve is to be that abscissa, " ink knife aperture " are the quadratic polynomial curve of ordinate with " dot area percentage ", the relation between expression dot area percentage and the ink knife aperture.
Step 4: obtain the dot area percentage of each ink-covered area correspondence of product to be printed,
By seal front port or software, obtain after the product layout to be printed through the 1-bit of RIPization tiff image file, the printer characteristics file that obtains according to this 1-bit tiff image file layout information and step 1 then obtains the pairing dot area percentage in each ink-covered area of product to be printed:
Width according to ink-covered area in the printer characteristics file, the mode that adopts center line to aim at, earlier with image and whole ink-covered area with the alignment that is as the criterion of a printing center line, with image from the centre to the both sides subregion, the width of each row behind the subregion equates with the width of printing machine ink-covered area, as shown in Figure 4.Then,, add up pixel value in each subregion successively and be 0 point, and calculate corresponding percentage, promptly get the dot area percentage of each subregion according to the layout information in the 1-bit tiff image file.Then make its pixel value be " 1 " for unmatched areas at both sides, adopt the mode of symmetrical filler method to fill.
The ink-covered area number of printing machine is an even number, and the printing center line mediates on the boundary line of two adjacent ink-covered areas, promptly prints center line whole ink-covered area is divided into two parts; The ink-covered area number of printing machine is an odd number, and if any 21 ink-covered areas, area principle is constant, and with the bisector of printing center line as middle ink-covered area, promptly the both sides of this printing center line have 10.5 ink-covered areas respectively, but do not influence the calculating respectively of each ink-covered area dot area percentage.Calculate the dot area percentage of each ink-covered area by the following method:
Suppose: the ink-covered area number is N, and the whole width of ink-covered area is W
-im, unit is mm; The figure image width is W
-im, height is H, unit is a pixel; Image resolution ratio is Re
-im, unit is pixel/mm;
Then have: the width W of single ink-covered area
nFor: W
n=W
-in/ N (1)
The number of picture elements N that the image both sides will be added
cFor: N
c=(W
-in* Re
-im-W
-im)/2 (2)
Perhaps be: N
c=(N * W
n* Re
-im-W
-im)/2 (3)
If use N[i] number of the interior stain (pixel value is 0 point) of i subregion of expression, then the ink-covered area dot area percentage P[i of i subregion] be:
Obtain the subregion dot area percentage of corresponding each ink-covered area of each color of each space of a whole page, this subregion dot area percentage is as the basis of calculating corresponding ink-covered area opening value.
Step 5: determine the ink knife opening value (ink pre-setting information) of each ink-covered area dot area percentage correspondence,
Each ink-covered area dot area percentage of the product to be printed that obtain according to step 4, on the mass colour transfer curve that step 3 is set up, search and definite ink knife opening value corresponding with each ink-covered area dot area percentage, be ink pre-setting information, this information can save as corresponding JDF file or Txt file.
Step 6: the presetting of ink in printing press,
The JDF file that comprises the ink pre-setting data that step 5 is obtained is sent to the console of the printing machine with CIP ink pre-setting interface function through network or other storage mediums, presets the black key of this printing machine automatically; The printing machine that does not possess CIP ink pre-setting interface function by the demonstration of printing machine operating personnel according to the Txt file that comprises the ink pre-setting data, manually presets the black key of printing board.
Step 7: the black key that presets is adjusted
According to the ink in printing press information that step 6 presets, try printing, and the quality of the specimen page that obtains according to printing, black key is carried out trickle adjustment, meet the requirements until the quality of printed matter, the black key assignments of record this moment is as printing ink OK value;
Step 8: the mass colour transfer curve is corrected,
The printing ink preset value that step 5 is obtained and the printing ink OK value of step 7 compare, and the mass colour transfer curve is corrected, and make it to reach unanimity with the actual initialize data of printing machine ink fountain, carry out the rectification of mass colour transfer curve by following formula:
Error
n＝K
p(OKValue
n-PreValue
n)；0＜K
p≤1，n＝1，2，3....InkZones；
Wherein, OKValue
nAnd PreValue
nRepresent the printing ink OK value and the printing ink preset value of n ink-covered area correspondence respectively, K
pThe influence that the difference of expression printing ink OK value and printing ink preset value produces transfer curve accounts for the proportion weights of whole difference, and InkZones represents the number of printing machine ink-covered area.
Correcting the purpose of mass colour transfer curve, is to order the influence of factors such as fatigue strength, ink temperature, viscosity and paper difference to the ink pre-setting result for the linearity, the China ink of eliminating printing net-point and enlarge, put the China ink amount.
Step 9: will go up the foundation that the mass colour transfer curve after the step corrects presets as next mass colour.
Adopt the inventive method, not only can realize presetting of each ink-covered area printing ink of printing machine fast, the accuracy of ink pre-setting is good, and shortens the available machine time, reduces the waste of materials such as paper, printing ink in the printing machine pre-press process, and improves the quality of printed matter.
Claims (1)
1. the ink pre-setting method based on JDF digitlization flow process is characterized in that, carries out according to the following steps:
Step 1: the tag file that generates printing machine
Printing machine equipment information is generated the tag file of this printing machine, this tag file comprises printing machine model, print speed printing speed, ink roller radius, ink-covered area integral width, ink-covered area number and transfer curve rectification parameter, and above-mentioned tag file is preserved with the form of XML document;
Step 2: the experimental data of the standard specimen page of the normal printing of acquisition step 1 described printing machine, this experimental data is made up of the dot area percentage and the ink knife opening value of different printing look;
Step 3:, set up the mass colour transfer curve of this printing machine according to the experimental data that step 2 is gathered
All data edits that step 2 is collected then, to the data processing of classifying, are set up the mass colour transfer curve of this printing machine, set up mass colour transfer curve concrete grammar and are:
1) dot area percentage and the ink knife opening value composition matrix data to the resulting process color of step 2 carries out vector quantization, promptly forms matrix vectors that contain 2 row, wherein, the dot area percentage of the 1st each ink-covered area of line display, the corresponding ink knife opening value of the 2nd line display,
2) will go up the step 1) middle 2 matrix vectors of going that form, be foundation with the 1st dot area percentage of going, adopt the method for bubble sort to carry out the ascending order arrangement, the data of the 2nd row are adjusted accordingly with the 1st data of going,
3) will go up the step 2) middle 2 matrix vectors of going that form, be foundation with the 1st dot area percentage of going, for identical data, only keep wherein one group, weed out other identical data rows,
4) the mass colour transfer curve can be approximated to be a quadratic polynomial curve, the step 3 in the utilization) the middle 2 row matrix vectors that form, adopt least square method to ask for the coefficient of this quadratic polynomial,
The coefficient and the corresponding quadratic polynomial of the quadratic polynomial of trying to achieve the 5) step 4 in the utilization) are unit with dot area percentage from 0 to 100 every interval 1, ask for corresponding ink knife opening value;
6) to the last step 5) in the pairing ink knife opening value of each dot area percentage of trying to achieve, carry out at 3 and ask average smoothing processing,, be saved in the form as final ink knife opening value, promptly the mass colour transfer curve of Xing Chenging is that form with data is stored in the form, is provided with using when the back is set;
Step 4: the dot area percentage that obtains each ink-covered area correspondence of product to be printed
By seal front port or software, obtain after the product layout to be printed through the 1-bit of RIPization tiff image file, the printer characteristics file that obtains according to this 1-bit tiff image file layout information and step 1 then, obtain the pairing dot area percentage in each ink-covered area of product to be printed, the concrete grammar that obtains dot area percentage is:
1) mode that adopts center line to aim at, with one the printing center line is benchmark, the bisector of image and the bisector of whole ink-covered area are overlapped with this printing center line respectively, then with image by the centre to the both sides subregion, and the width of every row is identical with the width of printing machine ink-covered area behind the subregion
2) picture traverse and whole ink-covered area width are inequality, and the unmatched areas at both sides that causes is set its pixel value and is " 1 ", adopts the mode of symmetrical filler to fill, and the pixel count of filling is N
C
3) use N[i] number of the interior stain (pixel value is 0 point) of i subregion of expression, then the ink-covered area dot area percentage P[i of i subregion] be:
In the formula, W
nBe the width of single ink-covered area, unit is mm; Re
-imBe image resolution ratio, unit is pixel/mm; H is the height of image, and unit is a pixel; N is the ink-covered area number;
Wherein, W
n=W
-in/ N, W
-inBe the whole width of ink-covered area, unit is mm;
Then, the number of picture elements N of image both sides interpolation
cFor: N
c=(W
-in* Re
-im-W
-im)/2
Perhaps be: N
c=(N * W
n* Re
-im-W
-im)/2
In the formula, the figure image width is W
-im, unit is pixel/mm;
Step 5: the ink knife opening value of determining each ink-covered area dot area percentage correspondence of product to be printed
Each ink-covered area dot area percentage of the product to be printed that generate according to step 4, on the mass colour transfer curve that step 3 is set up, search and definite ink knife opening value corresponding with each ink-covered area dot area percentage, this ink knife opening value is the ink pre-setting value of printing machine, and this ink pre-setting value is saved as JDF file or Txt file;
Step 6: printing machine is carried out ink pre-setting
The JDF file that comprises the ink pre-setting data that step 5 is obtained is sent to the console of the printing machine with CIP ink pre-setting interface function through network or other storage mediums, automatically preset the black key of this printing machine, the printing machine that does not possess CIP ink pre-setting interface function, according to the demonstration of the Txt file that comprises the ink pre-setting data, manually preset the black key of printing board;
Step 7: the black key that presets is adjusted
According to the ink in printing press information that step 6 presets, try printing, according to the quality of print sample, black key to printing machine carries out trickle adjustment, until printing out the satisfactory specimen page of quality, record black key assignments at this moment, the printing ink OK value that this China ink key assignments is a printing machine;
Step 8: correct the mass colour transfer curve
The printing ink preset value that obtains according to step 5 and the printing ink OK value of step 7 compare, and correct the mass colour transfer curve, make it consistent with the actual preset value of printing machine ink fountain, by following formula the mass colour transfer curve are corrected:
Error
n＝K
p(OKValue
n-PreValue
n)；0＜K
p≤1，n＝1，2，3....InkZones；
In the formula, OKValue
nAnd PreValue
nRepresent the printing ink OK value and the printing ink preset value of n ink-covered area correspondence respectively, K
pThe influence that the difference of expression printing ink OK value and printing ink preset value produces transfer curve accounts for the proportion weights of whole difference, and InkZones represents the number of printing machine ink-covered area.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102202161B (en) * | 2010-03-22 | 2012-09-26 | 北大方正集团有限公司 | Blue paper proofing implementation method, system and blue paper proofing equipment |
| CN102582242A (en) * | 2011-12-19 | 2012-07-18 | 北京工业大学 | Ink key opening prediction method in digital printing working process |
| CN103009852B (en) * | 2012-12-26 | 2015-04-29 | 方正国际软件有限公司 | Method and system for preventing printing ghost image |
| CN104943358B (en) * | 2014-03-27 | 2017-06-06 | 北大方正集团有限公司 | The characteristic generation method of printing machine and generating means |
| CN106142832B (en) * | 2015-03-23 | 2018-12-28 | 北大方正集团有限公司 | The determination method of ink pre-setting curve and the determining device of ink pre-setting curve |
| CN106274051B (en) * | 2015-06-05 | 2018-03-27 | 靳鹏 | A kind of ink pre-setting method |
| CN106113936B (en) * | 2016-08-02 | 2018-09-28 | 昆明理工大学 | A kind of printing machine intelligence ink-feeding device and ink supply method |
| CN107042689B (en) * | 2017-04-24 | 2019-05-03 | 北京奇良海德印刷股份有限公司 | A kind of printing color quality detecting method |
| CN109849504B (en) * | 2018-10-25 | 2021-02-05 | 广州爱品互联科技有限公司 | Ink key compensation and correction data calculation method, system and device |
| CN111959120B (en) * | 2020-08-24 | 2021-06-04 | 深圳市浩立信图文技术有限公司 | Ink control system and ink control method of digital printing machine |
| CN112918074A (en) * | 2021-01-21 | 2021-06-08 | 上海出版印刷高等专科学校 | Correction method for printing equipment |
| CN113635671B (en) * | 2021-08-12 | 2023-02-03 | 深圳市凯印科技有限公司 | Intelligent ink presetting method and system |
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| 浅谈油墨预置技术. 宫燕燕.今日印刷，第2007卷第3期. 2007 * |
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