CN115122757A - Digital printing quality evaluation method - Google Patents
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- CN115122757A CN115122757A CN202210876788.7A CN202210876788A CN115122757A CN 115122757 A CN115122757 A CN 115122757A CN 202210876788 A CN202210876788 A CN 202210876788A CN 115122757 A CN115122757 A CN 115122757A
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- 238000013441 quality evaluation Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 239000003086 colorant Substances 0.000 claims description 18
- 230000004075 alteration Effects 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 abstract description 4
- 238000011002 quantification Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
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- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
The invention discloses a method for evaluating the quality of digital printing, which comprises the following steps: presetting quality parameters, establishing a printing quality evaluation comparison table and printing a test standard plate according to the set quality parameters; measuring the test standard plate, and calculating parameter tolerance by using the obtained measurement data; printing the test control strip and measuring the test control strip data, and calling a printing quality evaluation comparison table to evaluate the measured test control strip data. The digital printing quality evaluation method fully considers each quality parameter and the influence thereof in the printing process, establishes a score system for representing the quality of the printing, thereby realizing the quantification of the printing quality evaluation, and the established standard printing quality evaluation method also enables the evaluation of the printing quality to be more objective and more efficient.
Description
Technical Field
The invention belongs to the technical field of printing, and particularly relates to a digital printing quality evaluation method.
Background
At present, the printing industry enters a development opportunity and develops towards automation, flow and standardization, although documents such as international standards, national standards or industrial standards of the printing industry and the like specify relevant parameters of printing quality, no specific operation method is provided, quantitative detection methods for the quality of printed matters are lacked, and the method mainly depends on the experience of workers to compare the pattern color of a standard sample sheet and the pattern color of the current printed sheet according to visual observation, so that the evaluation of the printing quality is not uniform, and the method becomes a core problem influencing the development of the printing industry.
Accordingly, further developments and improvements are still needed in the art.
Disclosure of Invention
In order to solve the above problems, a digital printing quality evaluation method is proposed. The technical scheme of the invention is as follows:
a digital printing quality evaluation method comprises the following steps:
presetting quality parameters, establishing a printing quality evaluation comparison table and printing a test standard plate according to the set quality parameters;
measuring the test standard plate, and calculating parameter tolerance by using the obtained measurement data;
printing the test control strip and measuring the test control strip data, and calling a printing quality evaluation comparison table to evaluate the measured test control strip data.
The quality evaluation method of the digital printed matter comprises the following steps of quality parameter including density uniformity, chroma, dot gain value, gray balance and color of a printing stock.
The digital presswork quality evaluation method comprises the steps of establishing a printing quality evaluation comparison table based on preset quality parameters, wherein the quality parameters in the printing quality evaluation comparison table have one-to-one correspondence with fractions and weights representing printing quality.
The digital presswork quality evaluating method comprises the steps that in the printing quality evaluation comparison table, the density uniformity of CMYK four colors corresponds to 6 minutes of each color, the total is 24 minutes, and the weight is 21.2%;
the chroma of CMYKRGB seven colors is 5 points corresponding to each color, and is 35 points in total, and the weight is 31.0 percent;
dot gain values of 25%, 50% and 75% of CMYK four colors correspond to 10 points of each color, the total is 40 points, and the weight is 35.4%;
25%, 50% and 75% of three-color ash are balanced, corresponding to 12 points, and the weight is 10.6%;
the chroma of the printing stock is 2 points, and the weight is 1.8 percent.
The digital presswork quality evaluating method comprises the following steps of measuring a test standard plate, and calculating parameter tolerance by using obtained measurement data:
the colorimetric tolerance is defined by the colorimetric tolerance standard defined in the printing universal standard ISO12647-2, where the color difference requirement for CMYK is Δ E <4.2 and the color difference requirement for RGB is Δ E < 3.5.
The digital presswork quality evaluating method comprises the following steps of measuring a test standard plate, and calculating parameter tolerance by using obtained measurement data:
when a test target plate is printed, test samples with different ink amounts from small to large are obtained by controlling the ink amounts of CMYK, density values and chromatic values of CMYK on the test target plate under different ink amounts are measured, a series of CMYKRGB chromaticity and chromatic difference value lists under different CMYK density conditions are obtained, then the optimal density values, the upper limit values and the lower limit values of CMYK are determined according to CMYKRGB standard chromaticity and chromatic difference requirements defined in ISO12647-2, and density uniformity tolerance is calculated.
The digital presswork quality evaluating method comprises the following steps of measuring a test standard plate, and calculating parameter tolerance by using obtained measurement data:
respectively measuring and recording dot expansion values of 25%, 50% and 75% of CMYK four colors under the three conditions of the optimal density value, the density upper limit value and the density lower limit value, and taking the smaller value of the dot expansion values of CMYK four colors and the absolute value of the dot difference value under the optimal density condition as the dot tolerance.
The digital presswork quality evaluating method comprises the following steps of measuring a test standard plate, and calculating parameter tolerance by using obtained measurement data:
the tolerance for gray balance is determined as af <3 with the gray balance standard defined in the GRACOL standard and the substrate chromaticity tolerance is determined with the substrate chromaticity standard defined in ISO 12647-2.
The digital presswork quality evaluation method comprises the following specific steps of calling a printing quality evaluation comparison table to evaluate measured measurement and control strip data:
analyzing the measured data of the measuring and controlling strip, respectively calculating the corresponding chromatic aberration, the dot gain error, the gray balance chromatic aberration and the printing stock chromatic aberration of each color block according to the color of each color block, further calculating the tolerance value, calling a printing quality evaluation comparison table to calculate the score of each color block, and calculating the integral score by utilizing the calculated value of each color block.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a digital printing quality evaluation method, which fully considers all quality parameters and the influence thereof in the printing process and establishes a score system for representing the quality of printing, thereby realizing the quantification of printing quality evaluation.
Drawings
FIG. 1 is a flow chart of a method for evaluating the quality of a digitized printed matter according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following description is given for clear and complete description of the technical solution of the present invention with reference to the embodiments of the present invention, and other similar embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
A method for evaluating the quality of a digitized print as shown in fig. 1, comprising the steps of:
s100, presetting quality parameters, establishing a printing quality evaluation comparison table, and printing a test standard plate according to the set quality parameters.
Specifically, the quality parameters include density uniformity, chromaticity, dot gain value, gray balance, and substrate chromaticity.
And establishing a printing quality evaluation comparison table based on preset quality parameters, wherein the quality parameters in the printing quality evaluation comparison table have one-to-one correspondence with the scores and the weights for representing the printing quality. Specifically, in the print quality evaluation comparison table,
density uniformity of CMYK four colors is 24 points corresponding to 6 points of each color, and weight is 21.2%;
the chroma of CMYKRGB seven colors is 5 points corresponding to each color, and is 35 points in total, and the weight is 31.0 percent;
dot gain values of 25%, 50% and 75% of CMYK four colors correspond to 10 points of each color, the total is 40 points, and the weight is 35.4%;
25%, 50% and 75% of three-color ash are balanced, corresponding to 12 points, and the weight is 10.6%;
the chroma of the printing stock is 2 points, and the weight is 1.8 percent.
And S200, measuring the test standard plate, and calculating parameter tolerance by using the obtained measurement data.
1) The color tolerance is defined by the color tolerance standard defined in the printing universal standard ISO12647-2, the color difference requirement for CMYK is Δ E <4.2, and the color difference requirement for RGB is Δ E < 3.5.
2) Calculating to obtain density uniformity tolerance by taking the chromatic value as a reference, specifically:
when a test target plate is printed, test samples with different ink amounts from small to large are obtained by controlling the ink amounts of CMYK, density values and chromatic values of CMYK on the test target plate under different ink amounts are measured, a series of CMYKRGB chromaticity and chromatic difference value lists under different CMYK density conditions are obtained, then the optimal density values, the upper limit values and the lower limit values of CMYK are determined according to CMYKRGB standard chromaticity and chromatic difference requirements defined in ISO12647-2, and density uniformity tolerance is calculated.
3) Calculating to obtain a dot tolerance by taking the density uniformity tolerance as a reference, specifically:
respectively measuring and recording dot expansion values of 25%, 50% and 75% of CMYK four colors under the three conditions of the optimal density value, the upper limit value and the lower limit value of density, taking the smaller value of the absolute value of the dot difference value of the CMYK four colors under the optimal density condition as the dot tolerance, taking C color 50% dots as an example, if the 50% dot expansion values of C under the optimal density value, the upper limit value and the lower limit value of density are respectively 13%, 17% and 10%, calculating min (abs (17% -13%), abs (10% -13%) to obtain 3% as the tolerance.
4) Determining ash balance tolerance
The tolerance for gray balance is determined as af <3 with the gray balance criteria defined in the gradol criteria.
5) The colorimetric tolerance is determined in accordance with the substrate colorimetric standards defined in ISO 12647-2.
S300, printing the measurement and control strip, measuring the data of the measurement and control strip, and calling a printing quality evaluation comparison table to evaluate the measured data of the measurement and control strip.
Analyzing the measured data of the measuring and controlling strip, respectively calculating the corresponding chromatic aberration, the dot gain error, the gray balance chromatic aberration and the printing stock chromatic aberration of each color block according to the color of each color block, further calculating the tolerance value, calling a printing quality evaluation comparison table to calculate the score of each color block, and calculating the integral score by utilizing the calculated value of each color block. In particular, the method comprises the following steps of,
1) measuring the measurement and control strips on the printing sample sheet, respectively calculating the corresponding color difference, the dot gain error, the gray balance color difference and the color difference of a printing stock of each color block according to the color of each color block, calculating the score of each color block according to the tolerance value and the value set in the printing quality evaluation comparison table, and then calculating the score according to a preset calculation rule, wherein the specific is as follows;
2) summarizing the average score of each color according to the colors, for example, if the measurement and control strip has 20 100% C colors, calculating the average score of the 20C colors, and the other color calculation methods are the same;
3) summing the average scores of all the evaluation parameters to obtain a total score;
4) the total score is divided by the full score and the final evaluation score of the final proof is obtained in percent.
The invention provides a digital printing quality evaluation method, which fully considers all quality parameters and the influence thereof in the printing process and establishes a score system for representing the quality of printing, thereby realizing the quantification of printing quality evaluation.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Claims (9)
1. A digital printing quality evaluation method is characterized by comprising the following steps:
presetting quality parameters, establishing a printing quality evaluation comparison table and printing a test standard plate according to the set quality parameters;
measuring the test standard plate, and calculating parameter tolerance by using the obtained measurement data;
and printing the test control strip, measuring the data of the test control strip, and calling a printing quality evaluation comparison table to evaluate the measured data of the test control strip.
2. The method of claim 1, wherein the quality parameters include density uniformity, chroma, dot gain value, gray balance, substrate chroma.
3. The method for evaluating the quality of the digitized presswork according to claim 1, wherein a printing quality evaluation comparison table is established based on preset quality parameters, and each quality parameter in the printing quality evaluation comparison table has a one-to-one correspondence relationship with the fraction and the weight representing the printing quality.
4. The method for evaluating the quality of a digitized printed matter according to claim 3, wherein in the print quality evaluation look-up table,
density uniformity of CMYK four colors is 24 points corresponding to 6 points of each color, and weight is 21.2%;
the chroma of CMYKRGB seven colors is corresponding to 5 points of each color, and is 35 points in total, and the weight is 31.0 percent;
dot gain values of 25%, 50% and 75% of CMYK four colors correspond to 10 points of each color, the total is 40 points, and the weight is 35.4%;
25%, 50% and 75% of three-color ash are balanced, corresponding to 12 points, and the weight is 10.6%;
the chroma of the printing stock is 2 points, and the weight is 1.8 percent.
5. The method for evaluating the quality of a digitized printed matter according to claim 1, wherein the measurement is performed on a test template, and the calculation of the parameter tolerance using the obtained measurement data is specifically:
the colorimetric tolerance is defined by the colorimetric tolerance standard defined in the printing universal standard ISO12647-2, where the color difference requirement for CMYK is Δ E <4.2 and the color difference requirement for RGB is Δ E < 3.5.
6. The method for evaluating the quality of a digitized printed matter according to claim 5, wherein the measurement is performed on a test target, and the calculation of the parameter tolerance using the obtained measurement data is specifically:
when a test target plate is printed, test samples with different ink amounts from small to large are obtained by controlling the ink amounts of CMYK, density values and chromatic values of CMYK on the test target plate under different ink amounts are measured, a series of CMYKRGB chromaticity and chromatic difference value lists under different CMYK density conditions are obtained, then the optimal density values, the upper limit values and the lower limit values of CMYK are determined according to CMYKRGB standard chromaticity and chromatic difference requirements defined in ISO12647-2, and density uniformity tolerance is calculated.
7. The method for evaluating the quality of a digitized printed matter according to claim 6, wherein the measurement is performed on a test target, and the calculation of the parameter tolerance using the obtained measurement data is specifically:
respectively measuring and recording dot expansion values of 25%, 50% and 75% of CMYK four colors under the three conditions of the optimal density value, the density upper limit value and the density lower limit value, and taking the smaller value of the dot expansion values of CMYK four colors and the absolute value of the dot difference value under the optimal density condition as the dot tolerance.
8. The method for evaluating the quality of a digitized printed matter according to claim 7, wherein the measurement is performed on a test target, and the calculation of the parameter tolerance using the obtained measurement data is specifically:
the tolerance for gray balance is determined as af <3 with the gray balance standard defined in the GRACOL standard and the substrate chromaticity tolerance is determined with the substrate chromaticity standard defined in ISO 12647-2.
9. The method for evaluating the quality of the digitized presswork according to claim 1, wherein the step of calling a printing quality evaluation comparison table to evaluate the measured measurement and control strip data specifically comprises the following steps:
analyzing the measured data of the measuring and controlling strip, respectively calculating the corresponding chromatic aberration, the dot gain error, the gray balance chromatic aberration and the printing stock chromatic aberration of each color block according to the color of each color block, further calculating the tolerance value, calling a printing quality evaluation comparison table to calculate the score of each color block, and calculating the integral score by utilizing the calculated value of each color block.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2428040A1 (en) * | 2000-12-06 | 2002-06-13 | Delaware Capital Formation, Inc. | Spectral color control method |
| US20060170996A1 (en) * | 2005-02-02 | 2006-08-03 | Steven Headley | Color control of a web printing press utilizing intra-image color measurements |
| 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 |
| 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 |
| 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 |
| CN111267467A (en) * | 2020-03-02 | 2020-06-12 | 中国印刷科学技术研究院有限公司 | Offset printing standard test plate and production and application method thereof |
-
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- 2022-07-25 CN CN202210876788.7A patent/CN115122757B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2428040A1 (en) * | 2000-12-06 | 2002-06-13 | Delaware Capital Formation, Inc. | Spectral color control method |
| US20060170996A1 (en) * | 2005-02-02 | 2006-08-03 | Steven Headley | Color control of a web printing press utilizing intra-image color measurements |
| 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 |
| 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 |
| 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 |
| CN111267467A (en) * | 2020-03-02 | 2020-06-12 | 中国印刷科学技术研究院有限公司 | Offset printing standard test plate and production and application method thereof |
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Inventor after: Dai Junping Inventor after: Zhang Dong Inventor after: Zhao Li Inventor after: Li Xinjian Inventor after: Elizati Azati Inventor before: Dai Junping Inventor before: Elizati Azati Inventor before: Zhang Dong |
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Address after: Room 514, 5th Floor, Office Building 32, Qingdao National Advertising Industry Park, No. 89 Changcheng Road, Chengyang District, Qingdao City, Shandong Province, 266000 Patentee after: Printing Industry Society (Qingdao) Digital Technology Co.,Ltd. Address before: Unit 514, Office 5, Building 32, "Qingdao National Advertising Industrial Park", No. 89, Changcheng Road, Chengyang District, Qingdao City, Shandong Province, 266000 Patentee before: Yingong Society (Qingdao) Internet Technology Co.,Ltd. |