CN111497481B - Method for improving matte coating surface treatment effect of coated paper - Google Patents
Method for improving matte coating surface treatment effect of coated paper Download PDFInfo
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- CN111497481B CN111497481B CN202010355356.2A CN202010355356A CN111497481B CN 111497481 B CN111497481 B CN 111497481B CN 202010355356 A CN202010355356 A CN 202010355356A CN 111497481 B CN111497481 B CN 111497481B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
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Abstract
The invention discloses a method for improving the surface treatment effect of a coated paper matte coating, which is characterized by comprising the following steps of: the method comprises the following steps: (1) and (3) improving the saturation: the target value of each primary color of the printed sheet before surface treatment is improved; (2) the contrast is improved; (3) the definition is improved; (4) the details are improved. The improvement of the saturation is realized by changing the target values of the black, blue, red and yellow colors, the target value is enlarged by changing the screen points, the adjustment of the contrast is realized, the definition is improved by adopting higher screen line adding number, and the detail is improved by using the ink with higher concentration, so that the whole color saturation is effectively improved after the printed matter is covered with the matte film, and the visual effect is fine, smooth and bright.
Description
Technical Field
The invention relates to the technical field of printing, in particular to a method for improving the surface treatment effect of a coated paper matte coating.
Background
Needless to say, ISO12647-2, part 2 control of the process of printing, halftone, proof, and finished printed products, offset printing, is the most widely used offset printing process standard for printing enterprises. The standard is a strong foundation for performing printing standardization evaluation and correction, and with the standard, printing standardization and process control can be effectively performed. The standard was promulgated in 1996 and was revised once in each of 2004 and 2013, respectively. Currently, the ISO12647-2 standard executed by printing enterprises in offset printing production is 2004 edition mostly, and the standard has some differences from the current actual printing conditions, so that the printing enterprises need to carry out new control on prepress and printing processes of the enterprises according to the 2013 ISO12647-2 standard.
The main differences between ISO12647-2 standards, 2004 and 2013:
the main differences between ISO12647-2 standards, 2004 and 2013, are in the definition of paper type, ink color, dot gain, etc.
1. Paper type: the 2013 version of the standard defines a brand-new 8 types of paper, the paper type is changed from 5 types to 8 types, and the CIE Lab chromatic value of the paper is also changed correspondingly. The paper type defined by the 2013 standard is closer to the paper type used by most printing enterprises in China, and more accords with actual production.
2. Ink color: the 2013 version of the standard changes the ink color from 5 to 8 according to the paper type defined by the standard, and the CIE Lab chroma value of the ink color is changed correspondingly. It is also reasonable that the ink colors are updated accordingly, depending on the paper type.
3. Dot gain rate: under the current mainstream CTP plate making process, a larger increase of the tone value occurs in a bright tone part, which is opposite to the situation in the 2004 standard, and a larger increase of the tone value occurs in a middle tone part and a dark tone part in the 2004 standard.
The control process of ISO 12647-2:2013 standard is realized in the digital proofing link:
the GMG digital proofing software is taken as an example, and the control process of realizing ISO 12647-2:2013 in the digital proofing link is introduced.
1. Inputting an ICC file: in GMG digital proofing software, an ICC file (PSO Coated V3.ICC, namely Fogra51.ICC) conforming to ISO 12647-2:2013 standard is input as a target value of digital proofing.
2. Cyclic correction of digital proofing: outputting an ECI2002_ CMYK _ iO.GIF test sample by using a digital proofing machine, measuring by using a spectrophotometer, taking the measured data as the current value of the digital proofing, comparing the current value with a target value to obtain the color block number of the maximum Δ E, the average Δ E and the maximum Δ E >3, and if the proofing result does not meet the standard requirement, calculating the target value and the current value and reprinting; and ending the process control if the requirements are met.
Offset printing involves CIE Lab and CIE Lch color spaces, color gamut, hue and saturation: wherein CIE Lab is a color system of CIE, and the color system is based on the color system and is basically numerical information for determining a certain color; the CIE Lch color space uses the same color space as L a b, but it uses L to represent the lightness value; c represents a saturation value and H represents a hue angle value to obtain a cylindrical coordinate; gamut is the method of encoding a color, also referred to as the sum of colors that a technical system is capable of producing, and in computer graphics processing, gamut is some complete subset of colors, which is most commonly used to accurately represent a given situation, such as a given color space or the rendering range of an output device; the hue is the principal characteristic of color, and is the most accurate standard for distinguishing various colors, and in fact, colors other than black, white and gray have the attribute of hue, and hue is formed by primary color, secondary color and compound color, and the hue and color can present texture appearance, and various hues in nature are infinite and abundant, such as purplish red, silver gray, orange yellow and the like, and the hue is the appearance of various colors and is called; saturation can be defined as chroma divided by lightness, which is the same as chroma, which characterizes how a color deviates from a gray of the same brightness, and it is noted that chroma is not the same concept at all, but because it and chroma determine the same effect that appears in the human eye, it is the case that chroma and saturation are considered the same concept.
At present, many books and periodicals adopt offset lithography, the offset lithography is based on ISO 12647-2:2013 standard, and the covers and packages of the books and periodicals adopt a surface treatment process of covering a matte film to protect the surfaces of the products from being scratched and improve the surface texture of the products. The printed matter has the characteristic of light color due to the surface treatment of the matte film; after the matte film is covered, the whole color saturation of the printed matter is low and gray; the contrast is low and details are lost. As shown in fig. 1, the effect of the ISO 12647-22013 standard printed sheets is shown in fig. 2, the effect of the IOS 12647-22013 standard printed sheets after the completion of the coating of the matte film is shown in fig. 1 and fig. 2, which are very obvious, particularly because, as shown in fig. 3, the blue line represents the color gamut of the ISO 12647-22013 standard; the red line represents the color gamut of the ISO 12647-22013 standard sample after the matt film is covered; obviously, the color gamut is much smaller after the matt film is coated, and is most obvious in terms of yellow, green, blue and purple; in the aspect of visual effect, the coated matte sample is lighter than a standard sample in color and not bright enough. Therefore, there is a need to develop a solution to the above problems.
Disclosure of Invention
In view of the above, the present invention is directed to the defects existing in the prior art, and the main object of the present invention is to provide a method for improving the surface treatment effect of a coated paper matte film, which can effectively solve the problems of low overall color saturation, gray color, low contrast and detail loss of the existing printed product after the coated paper matte film is coated.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving the surface treatment effect of a coated paper matte coating comprises the following steps:
(1) and (3) improving the saturation: the target value of each primary color of the printed sheet before surface treatment is improved; the color target data is as follows: black L7.0 a 0.0 b 0.0 blue L48.0 a-31.0 b-60.0 red L45.0 a 85.0 b 4.0 yellow L89.5 a-3.0 b 120; ISO 12647-: black L16.0 a 0.1 b-0.3 blue L56.0 a-34.9 b-52.5 red L48.1 a 75.3 b-5.2 yellow L88.9 a-4.0 b 92.4;
(2) and (3) improving contrast: adjusting the target value of the enlargement of the network points under a Multicolor method: 25% + 850% + 1075% + 14.5; the target value is expanded under the ISO 12647-22013 standard: 25% + 1250% + 1675% + 12.5;
(3) and (3) improving the definition: using 250lpi to add the number of the screen lines under a Multicolor method to ensure that the screen points are fine and the visual effect of a printed product is fine;
(4) and (3) improving details: the ink with higher concentration than ISO 12647-22013 standard is used under the Multicolor method to reduce the thickness of the ink layer and effectively control the ink to diffuse to the edges of the dots, so that the printed dots are clear and bright, and the visual effect of the printed product is bright and clear.
Preferably, the number of 250lpi screening lines in the step (2) is the number of screening lines of the zinc plate output.
Preferably, the concentration of the ink in the step (4) is measured by density: 0.06CC of Conch Pink and Magenta was extracted for sampling, and the density of the Conch Pink was 1.56g/cm3(ii) a The density of Magenta is 1.45 g/cm3(ii) a Thickness of ink layer: magenta is 1.0 μm; the Conch Pink was 0.93. mu.m.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme includes that:
the improvement of the saturation is realized by changing the target values of the black, blue, red and yellow colors, the target value is enlarged by changing the screen points, the adjustment of the contrast is realized, the definition is improved by adopting higher screen line adding number, and the detail is improved by using the ink with higher concentration, so that the whole color saturation is effectively improved after the printed matter is covered with the matte film, and the visual effect is fine, smooth and bright.
Drawings
FIG. 1 is a graph of the effect of prior art ISO 12647-22013 standard sheets;
FIG. 2 is a diagram illustrating the effect of IOS 12647-22013 standard sample after the completion of the coating with a dummy film;
FIG. 3 is a prior art color gamut diagram;
FIG. 4 is a comparison of the overall effect of the preferred embodiment of the present invention;
FIG. 5 is a comparison of the preferred embodiment of the present invention after saturation has been improved;
FIG. 6 is a color gamut diagram in a preferred embodiment of the present invention;
FIG. 7 is a comparison chart of the preferred embodiment of the present invention after contrast improvement;
FIG. 8 is a comparison of the improved definition of the preferred embodiment of the present invention;
FIG. 9 is a comparison of the preferred embodiment of the present invention after the details have been improved;
FIG. 10 is a comparison of the sample sheets before and after improvement in accordance with the preferred embodiment of the present invention.
Detailed Description
The invention discloses a method for improving the surface treatment effect of a coated paper matte coating, which comprises the following steps:
(1) and (3) improving the saturation: the target value of each primary color of the printed sheet before surface treatment is improved; the color target data is as follows: black L7.0 a 0.0 b 0.0 blue L48.0 a-31.0 b-60.0 red L45.0 a 85.0 b 4.0 yellow L89.5 a-3.0 b 120; ISO 12647-: black L16.0 a 0.1 b-0.3 blue L56.0 a-34.9 b-52.5 Red L48.1 a 75.3 b-5.2 yellow L88.9 a-4.0 b 92.4. Actual sheet effect pairs as shown in FIG. 5, and as can be seen in FIG. 6, the blue line represents the ISO 12647-22013 standard color gamut; the red line represents the color gamut of ISO12647-2 (2013) standard printed sheets after being coated with a matte film; the yellow line represents the color gamut of the Multicolor printed sheet after being covered with the matte film; from the color gamut chart, the color gamut of a printed piece of multi-color paper covered with a matte film is basically close to the color gamut of the ISO 12647-22013 standard, and is slightly smaller in orange, green and purple regions, which is much larger than the color gamut of the printed piece of ISO 12647-22013 standard covered with the matte film; in visual effect, the color of a printed multi-color finished matte film is close to that of an ISO12647-2 (2103) standard printed sheet, and the color saturation of the printed multi-color finished matte film is much higher than that of the printed multi-color finished matte film in ISO 12647-22103 standard.
(2) And (3) improving contrast: adjusting the target value of the enlargement of the network points under a Multicolor method: 25% + 850% + 1075% + 14.5; the target value is expanded under the ISO 12647-22013 standard: the adjustment effect is shown in FIG. 7 for 25% + 1250% + 1675% + 12.5.
(3) And (3) improving the definition: 250lpi of screen lines are used under the Multicolor method, so that the screen points are fine, the visual effect of the printed matter is fine, the 250lpi of screen lines is the number of screen lines output by the zinc plate, and the effect comparison is shown in fig. 8.
(4) And (3) improving details: using ink with higher concentration than ISO12647-2 (2013) standard under a Multicolor method to reduce the thickness of an ink layer, effectively controlling the ink to diffuse to the edges of dots, so that the printed dots are clear and bright, and the visual effect of a printed product is bright and clear; the ink concentration in this step is measured as density: 0.06CC of Conch Pink and Magenta was extracted for sampling, and the density of the Conch Pink was 1.56g/cm3(ii) a The density of Magenta is 1.45 g/cm3(ii) a Thickness of ink layer: magenta is 1.0 μm; the Conch Pink was 0.93 μm, and the effect was compared as shown in FIG. 9.
The design of the invention is characterized in that: the improvement of the saturation is realized by changing the target values of the black, blue, red and yellow colors, the target value is enlarged by changing the screen points, the adjustment of the contrast is realized, the definition is improved by adopting higher screen line adding number, and the detail is improved by using the ink with higher concentration, so that the whole color saturation is effectively improved after the printed matter is covered with the matte film, and the visual effect is fine, smooth and bright.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (3)
1. A method for improving the surface treatment effect of a coated paper matte coating is characterized by comprising the following steps: the method comprises the following steps:
(1) and (3) improving the saturation: the target value of each primary color of the printed sheet before surface treatment is improved; the color target data is as follows: black L7.0 a 0.0 b 0.0 blue L48.0 a-31.0 b-60.0 red L45.0 a 85.0 b 4.0 yellow L89.5 a-3.0 b 120; ISO 12647-: black L16.0 a 0.1 b-0.3 blue L56.0 a-34.9 b-52.5 red L48.1 a 75.3 b-5.2 yellow L88.9 a-4.0 b 92.4;
(2) and (3) improving contrast: adjusting the target value of the enlargement of the network points under a Multicolor method: 25% + 850% + 1075% + 14.5; the target value is expanded under the ISO 12647-22013 standard: 25% + 1250% + 1675% + 12.5;
(3) and (3) improving the definition: using 250lpi to add the number of the screen lines under a Multicolor method to ensure that the screen points are fine and the visual effect of a printed product is fine;
(4) and (3) improving details: the ink with higher concentration than ISO 12647-22013 standard is used under the Multicolor method to reduce the thickness of the ink layer and effectively control the ink to diffuse to the edges of the dots, so that the printed dots are clear and bright, and the visual effect of the printed product is bright and clear.
2. The method for improving the surface treatment effect of the coated paper matte coating film according to claim 1, wherein the method comprises the following steps: and (4) the number of 250lpi screening lines in the step (3) is the number of screening lines output by the zinc plate.
3. The method for improving the surface treatment effect of the coated paper matte coating film according to claim 1, wherein the method comprises the following steps: the ink concentration in the step (4) is measured in a density: respectively extracting 0.06CC of Conch Pink and Magenta for sample spreading, wherein the density of the Conch Pink is 1.56g/cm 3; magenta has a density of 1.45 g/cm 3; thickness of ink layer: magenta is 1.0 μm; the Conch Pink was 0.93. mu.m.
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|---|---|---|---|---|
| JPH01294038A (en) * | 1988-05-23 | 1989-11-28 | Mitsubishi Heavy Ind Ltd | Color printing of newspaper |
| EP0763928B1 (en) * | 1995-09-15 | 2001-10-10 | Agfa-Gevaert N.V. | Colour separation method and apparatus for same |
| CN102307273A (en) * | 2011-05-31 | 2012-01-04 | 武汉大学 | Digital proofing quality evaluation method based on visual inspection, International color consortium (ICC) standard and custom standard |
| CN104943354A (en) * | 2015-07-13 | 2015-09-30 | 东莞当纳利印刷有限公司 | Color management method and device for laminated printed products |
| CN106569753A (en) * | 2016-10-31 | 2017-04-19 | 敬业（东莞）印刷包装厂有限公司 | Wide-gamut color management method, system and apparatus |
| CN109605969A (en) * | 2018-12-29 | 2019-04-12 | 星光印刷（苏州）有限公司 | A kind of fine Dot Color control method |
| CN110481154A (en) * | 2019-08-15 | 2019-11-22 | 北京雅昌艺术印刷有限公司 | A kind of control method and control system of the misalignment of overlay film printed matter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008083617A (en) * | 2006-09-29 | 2008-04-10 | Kyocera Mita Corp | Developer and image forming method |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01294038A (en) * | 1988-05-23 | 1989-11-28 | Mitsubishi Heavy Ind Ltd | Color printing of newspaper |
| EP0763928B1 (en) * | 1995-09-15 | 2001-10-10 | Agfa-Gevaert N.V. | Colour separation method and apparatus for same |
| CN102307273A (en) * | 2011-05-31 | 2012-01-04 | 武汉大学 | Digital proofing quality evaluation method based on visual inspection, International color consortium (ICC) standard and custom standard |
| CN104943354A (en) * | 2015-07-13 | 2015-09-30 | 东莞当纳利印刷有限公司 | Color management method and device for laminated printed products |
| CN106569753A (en) * | 2016-10-31 | 2017-04-19 | 敬业（东莞）印刷包装厂有限公司 | Wide-gamut color management method, system and apparatus |
| CN109605969A (en) * | 2018-12-29 | 2019-04-12 | 星光印刷（苏州）有限公司 | A kind of fine Dot Color control method |
| CN110481154A (en) * | 2019-08-15 | 2019-11-22 | 北京雅昌艺术印刷有限公司 | A kind of control method and control system of the misalignment of overlay film printed matter |
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Effective date of registration: 20220818 Address after: No. 2, Daning Minzhu Road, Humen Town, Dongguan City, Guangdong Province, 523930 Patentee after: Dangnali (Guangdong) Printing Co.,Ltd. Address before: 523000 Daning village, Humen Town, Dongguan City, Guangdong Province Patentee before: JINGYE (DONGGUAN) PRINTING PACKAGING FACTORY CO.,LTD. |