阅读说明：本技术 一种包装印刷用纸的标准化色彩管理方法及装置 (Standardized color management method and device for packaging printing paper ) 是由 朱海远 唐俊辉 于 2020-07-02 设计创作，主要内容包括：本发明公开一种包装印刷用纸的标准化色彩管理方法及装置,该方法包括有以下步骤：(1)标准样张进行印刷；(2)对照样张进行印刷；(3)制定色域改善方案：经分析色域差异结合PressSIGN软件的评测,通过以下步骤：(3.1)通过印前设置网点形状；(3.2)通过印前出版补偿曲线设置；(3.3)使用柯达印能捷Harmony软件,将Y版在浅网阶调的出版补偿校正输出数据；(3.4)调整C M油墨的色相；(4)使用G7方法印刷措施实施后新的单粉卡色域样张；(5)新的数据用于建模。通过采用本发明方法和装置,使得印刷色域扩大了25％以上,更接近标准印刷效果,使得设计方的标准稿得以在单粉卡包装印刷中再现,满足使用的需要。(The invention discloses a standardized color management method and a standardized color management device for packaging printing paper, wherein the method comprises the following steps of: (1) printing the standard sample sheet; (2) printing the comparison sample sheet; (3) and (3) formulating a color gamut improvement scheme: the analyzed color gamut difference was combined with the evaluation of PressSIGN software by the following steps: (3.1) setting a dot shape before printing; (3.2) setting by a prepress publishing compensation curve; (3.3) using Kodak Netzeri Harmony software to compensate and correct the published output data of the Y edition in shallow network tone; (3.4) adjusting C M the hue of the ink; (4) the new single-powder card color gamut proof is implemented by using a G7 method printing measure; (5) the new data is used for modeling. By adopting the method and the device, the printing color gamut is enlarged by more than 25 percent and is closer to the standard printing effect, so that the standard draft of a design party can be reproduced in the single-powder-card packaging printing, and the use requirement is met.)

1. A standardized color management method for packaging printing paper is characterized in that: the method comprises the following steps:

(1) and (3) printing the standard sample sheet:

taking 128g of standard paper space shuttle coated paper;

following the ISO12647-2:2013 standard, the Fogra51 data object was adopted;

measurement conditions were as follows: m1, White Backing, D50/2;

printing ink: the four-color ink meets the standard of ISO 2846-1;

environment: the temperature is 22-25 ℃; humidity is 55-60%;

in the test layout IT8, a color gamut guide table and a P2P table are used for data acquisition; the color control bar, image is used to reference the main criteria and control points before printing: the reduction of the screen dots on the printing plate is 1% -99%, and the error between the screen dot reduction on the printing plate and the screen dots of the original is +/-0.5%; the position of the color control strip must be vertical to the printing direction; main control points of printing:

the pressure of various ink rollers of the equipment is taught to be in the range of 4-5mm in the factory specification;

the printing pressure of the printing machine is set to be 0.10mm on the basis of the thickness of the paper;

each mechanical part of the printing machine operates smoothly, and printed matters have no double images and overprint defects;

the technological parameters of the printing machine are set according to the standard, and the conductivity of the fountain solution is 680-1500;

the color phases of the four CMYK process colors on standard coated paper according to ISO12647-2:2013 are:

through tests, the corresponding density, namely the dry fading value, which achieves the above color phases and controls the color difference delta E to be less than 3 is as follows:

C 1.38 M 1.43 Y 0.95 K 1.78；

the dot gain standard of CMYK four primary colors on standard coated paper is 16% according to ISO12647-2:2013, namely ISO Curve C;

(2) printing by contrast of the sample sheet:

changing the paper to be the sun single-powder card, repeating the printing conditions according to the standard sample sheets to obtain the sample sheets of the single-powder card paper, measuring an IT8 color table, and obtaining the color gamut of the single-powder card paper;

(3) and (3) formulating a color gamut improvement scheme:

the analyzed color gamut difference was combined with the evaluation of PressSIGN software by the following steps:

(3.1) setting the dot shape before printing, and setting the dot shape as composite screening: setting the content below 25% as 20 mu frequency modulation net to increase spreading of ink on the paper surface at a light tone part and enlarge the ink reflection surface; the perception of color by vision is improved;

(3.2) setting by a prepress publishing compensation curve: reducing the plate output compensation of CMYK, controlling the dot gain to be 13-15% to increase the image contrast, and increasing the density value of four colors to be C1.45-1.50M 1.50-1.55Y 1.05-1.10K 1.80-1.85; the saturated ink layer helps to expand the gamut range;

(3.3) compensating and correcting the output data of the publishing compensation of the Y edition in the shallow web tone by using Kodak Netzachi software so as to effectively improve the image color of highlight parts of the file caused by the paper color problem and ensure that the gray balance in the tone is consistent with HC-cmy being 0.25;

(3.4) adjusting C M the hue of the ink, adding PANTONE Rhodamine Red 5% -8% into the primary color M ink; 5% -8% of PANTONE Process Biue is added into the primary color C ink;

(4) the new single-powder card color gamut proof after the printing measures are implemented by using the G7 method:

performing CTP curve calibration and printed sheet color adjustment by using a G7 method to ensure that CMYK meets the requirements of ISO 12647-2;

(5) the new data was used to model:

measuring a color gamut guide table IT8.7/3 on the printed sheet by using Alice-One iSIS;

ICC characteristic files are manufactured by adopting Profile Maker software according to the IT8.7/3 data of the color gamut guide table;

and circularly calibrating the GMG digital proofing system by using the ICC profile to obtain a digital proofing profile, performing digital draft of the single-powder card paper matched with the ISO color gamut on the profile, simulating the paper color of the single-powder card by using the digital draft, and accordingly, following the color by using a printer.

2. The method for standardized color management of packaging printing paper according to claim 1, characterized in that: in the step (3), ECI2002ColorChart Measre Data is used for color gamut difference analysis.

3. A standardized color management device for packaging printing paper is characterized in that: the system comprises a standard proof printing module, a comparison proof printing module, a color gamut establishing improvement scheme module, a new proof printing module and a new derivation module;

the standard sample printing module is used for printing a standard sample;

the comparison proof printing module is used for printing comparison proof;

the formulated color gamut improving scheme module is used for evaluating by analyzing color gamut difference and combining PressSIGN software, and comprises a prepress setting module, a prepress publishing compensation curve setting module, a data output module and an C M ink hue adjusting module;

the prepress setting module is used for setting the shape of the screen points into a composite screening mode: setting the content below 25% as 20 mu frequency modulation net to increase spreading of ink on the paper surface at a light tone part and enlarge the ink reflection surface; the perception of color by vision is improved;

the prepress publishing compensation curve setting module is used for reducing printing plate output compensation of CMYK, controlling the dot expansion to be 13-15% to increase image contrast, and increasing the density value of four colors to be C1.45-1.50M 1.50-1.55Y 1.05-1.10K 1.80-1.85; the saturated ink layer helps to expand the gamut range;

the data output module uses Kodak Negay Harmony software to compensate and correct the published compensation output data of Y edition in shallow tone so as to effectively improve the image color of highlight parts of a document caused by a paper color problem and ensure that the gray balance of the tone is consistent with HC-cmy being 0.25;

the C M ink hue adjusting module is used for adding PANTONE Rhodamine Red 5% -8% into primary color M ink; 5% -8% of PANTONE Process Biue is added into the primary color C ink;

the new proof printing module is used for performing CTP curve calibration and printed sheet color adjustment by using a G7 method, so that CMYK meets the requirements of ISO 12647-2;

the newly-built derivation module is used for measuring a color gamut derivation table IT8.7/3 on a printed sheet by using Alice-One iSIS; and (4) adopting Profile Maker software to make an ICC Profile according to the data of the color gamut guide table IT 8.7/3.

Technical Field

The invention relates to the technical field of printing, in particular to a standardized color management method for packaging printing paper.

Background

In modern society, the amount of package printing has increased over the printing of book-type publications. For historical reasons, standards of all designers, publishers and printers are established in book and periodical environments and processes. The listed papers cover coated papers (copperplate), uncoated offset papers and newsprint, for example with the international printing standard ISO 12647-2. However, the maximum amount of single-powder (coated white cardboard) paper is applied in the packaging printing, and no corresponding standard is established for the coated grey cardboard.

As shown in Table 1 and Table 2 below, the color (yellowish) of the paper of the single-powder cardboard does not meet the standard ISO 12647-2. Resulting in the inability of designers to print fully reduced colors on packages in coated paper based designs.

TABLE 1

TABLE 2

Trapping	Red	Green	Blue
				Space shuttle coated paper	82％	87％	86％
Sun sheet powder card paper	76％	78％	64％

Moreover, as can be seen from fig. 1, the color gamut of the single-powder cardboard in normal printing is significantly smaller than the standard color gamut.

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 a method for managing standardized colors of packaging and printing paper, which can effectively solve the problem that the color gamut of the existing single-powder cardboard during normal printing is significantly smaller than the standard color gamut.

In order to achieve the purpose, the invention adopts the following technical scheme:

a standardized color management method for packaging printing paper comprises the following steps:

(1) and (3) printing the standard sample sheet:

taking 128g of standard paper space shuttle coated paper;

following the ISO12647-2:2013 standard, the Fogra51 data object was adopted;

measurement conditions were as follows: m1, White Backing, D50/2;

printing ink: the four-color ink meets the standard of ISO 2846-1;

environment: the temperature is 22-25 ℃; humidity is 55-60%;

in the test layout IT8, a color gamut guide table and a P2P table are used for data acquisition; the color control bar, image is used to reference the main criteria and control points before printing: the reduction of the screen dots on the printing plate is 1% -99%, and the error between the screen dot reduction on the printing plate and the screen dots of the original is +/-0.5%; the position of the color control strip must be vertical to the printing direction; main control points of printing:

the pressure of various ink rollers of the equipment is taught to be in the range of 4-5mm in the factory specification;

the printing pressure of the printing machine is set to be 0.10mm on the basis of the thickness of the paper;

each mechanical part of the printing machine operates smoothly, and printed matters have no double images and overprint defects;

the technological parameters of the printing machine are set according to the standard, and the conductivity of the fountain solution is 680-1500;

the color phases of the four CMYK process colors on standard coated paper according to ISO12647-2:2013 are:

through tests, the corresponding density, namely the dry fading value, which achieves the above color phases and controls the color difference delta E to be less than 3 is as follows:

C 1.38 M 1.43 Y 0.95 K 1.78；

the dot gain standard of CMYK four primary colors on standard coated paper is 16% according to ISO12647-2:2013, namely ISO Curve C;

(2) printing by contrast of the sample sheet:

changing the paper to be the sun single-powder card, repeating the printing conditions according to the standard sample sheets to obtain the sample sheets of the single-powder card paper, measuring an IT8 color table, and obtaining the color gamut of the single-powder card paper;

(3) and (3) formulating a color gamut improvement scheme:

the analyzed color gamut difference was combined with the evaluation of PressSIGN software by the following steps:

(3.1) setting the dot shape before printing, and setting the dot shape as composite screening: setting the content below 25% as 20 mu frequency modulation net to increase spreading of ink on the paper surface at a light tone part and enlarge the ink reflection surface; the perception of color by vision is improved;

(3.2) setting by a prepress publishing compensation curve: reducing the plate output compensation of CMYK, controlling the dot gain to be 13-15% to increase the image contrast, and increasing the density value of four colors to be C1.45-1.50M 1.50-1.55Y 1.05-1.10K 1.80-1.85; the saturated ink layer helps to expand the gamut range;

(3.3) compensating and correcting the output data of the publishing compensation of the Y edition in the shallow web tone by using Kodak Netzachi software so as to effectively improve the image color of highlight parts of the file caused by the paper color problem and ensure that the gray balance in the tone is consistent with HC-cmy being 0.25;

(3.4) adjusting C M the hue of the ink, adding PANTONE Rhodamine Red 5% -8% into the primary color M ink; 5% -8% of PANTONE Process Biue is added into the primary color C ink;

(4) the new single-powder card color gamut proof after the printing measures are implemented by using the G7 method:

performing CTP curve calibration and printed sheet color adjustment by using a G7 method to ensure that CMYK meets the requirements of ISO 12647-2;

(5) the new data was used to model:

measuring a color gamut guide table IT8.7/3 on the printed sheet by using Alice-One iSIS;

ICC characteristic files are manufactured by adopting Profile Maker software according to the IT8.7/3 data of the color gamut guide table;

and circularly calibrating the GMG digital proofing system by using the ICC profile to obtain a digital proofing profile, performing digital draft of the single-powder card paper matched with the ISO color gamut on the profile, simulating the paper color of the single-powder card by using the digital draft, and accordingly, following the color by using a printer.

As a preferable scheme, in the step (3), the ECI2002ColorChart Measre Data is used for color gamut difference analysis.

A standardized color management device for packaging printing paper comprises a standard proof printing module, a comparison proof printing module, a color gamut establishing improvement scheme module, a new proof printing module and a newly-built export module;

the standard sample printing module is used for printing a standard sample;

the comparison proof printing module is used for printing comparison proof;

the formulated color gamut improving scheme module is used for evaluating by analyzing color gamut difference and combining PressSIGN software, and comprises a prepress setting module, a prepress publishing compensation curve setting module, a data output module and an C M ink hue adjusting module;

the prepress setting module is used for setting the shape of the screen points into a composite screening mode: setting the content below 25% as 20 mu frequency modulation net to increase spreading of ink on the paper surface at a light tone part and enlarge the ink reflection surface; the perception of color by vision is improved;

the prepress publishing compensation curve setting module is used for reducing printing plate output compensation of CMYK, controlling the dot expansion to be 13-15% to increase image contrast, and increasing the density value of four colors to be C1.45-1.50M 1.50-1.55Y 1.05-1.10K 1.80-1.85; the saturated ink layer helps to expand the gamut range;

the data output module uses Kodak Negay Harmony software to compensate and correct the published compensation output data of Y edition in shallow tone so as to effectively improve the image color of highlight parts of a document caused by a paper color problem and ensure that the gray balance of the tone is consistent with HC-cmy being 0.25;

the C M ink hue adjusting module is used for adding PANTONE Rhodamine Red 5% -8% into primary color M ink; 5% -8% of PANTONE Process Biue is added into the primary color C ink;

the new proof printing module is used for performing CTP curve calibration and printed sheet color adjustment by using a G7 method, so that CMYK meets the requirements of ISO 12647-2;

the newly-built derivation module is used for measuring a color gamut derivation table IT8.7/3 on a printed sheet by using Alice-One iSIS; and (4) adopting Profile Maker software to make an ICC Profile according to the data of the color gamut guide table IT 8.7/3.

Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme includes that:

by adopting the method and the device, the printing color gamut is enlarged by more than 25 percent and is closer to the standard printing effect, so that the standard draft of a design party can be reproduced in the single-powder-card packaging printing, and the use requirement is met.

Drawings

FIG. 1 is a color gamut comparison graph of coated paper and single-powder paperboard according to ISO 12647-2;

FIG. 2 is a comparison of the improved single-powder-card printing color gamut of the preferred embodiment of the present invention and the ISO target color gamut.

Detailed Description

The invention discloses a standardized color management method for packaging printing paper, which comprises the following steps:

(1) and (3) printing the standard sample sheet:

taking 128g of standard paper space shuttle coated paper;

following the ISO12647-2:2013 standard, the Fogra51 data object was adopted;

measurement conditions were as follows: m1, White Backing, D50/2;

printing ink: the four-color ink meets the standard of ISO 2846-1;

environment: the temperature is 22-25 ℃; humidity is 55-60%;

in the test layout IT8, a color gamut guide table and a P2P table are used for data acquisition; the color control bar, image is used to reference the main criteria and control points before printing: the reduction of the screen dots on the printing plate is 1% -99%, and the error between the screen dot reduction on the printing plate and the screen dots of the original is +/-0.5%; the position of the color control strip must be vertical to the printing direction; main control points of printing:

the pressure of various ink rollers of the equipment is taught to be in the range of 4-5mm in the factory specification;

the printing pressure of the printing machine is set to be 0.10mm on the basis of the thickness of the paper;

each mechanical part of the printing machine operates smoothly, and printed matters have no double images and overprint defects;

the technological parameters of the printing machine are set according to the standard, and the conductivity of the fountain solution is 680-1500;

the color phases of the four CMYK process colors on standard coated paper according to ISO12647-2:2013 are:

through tests, the corresponding density, namely the dry fading value, which achieves the above color phases and controls the color difference delta E to be less than 3 is as follows:

C 1.38 M 1.43 Y 0.95 K 1.78；

the dot gain standard on standard coated paper for the CMYK four process colors is 16% according to ISO12647-2:2013, ISO Curve C.

(2) Printing by contrast of the sample sheet:

and replacing the paper with the sun single-powder card, repeating the printing conditions according to the standard sample sheets to obtain the sample sheets of the single-powder card paper, and measuring an IT8 color table to obtain the color gamut of the single-powder card paper.

(3) And (3) formulating a color gamut improvement scheme:

analysis of color gamut differences in combination with the evaluation of PressSIGN software, in this example, color gamut difference analysis was performed using ECI2002ColorChart Measre Data, by the following steps:

(3.1) setting the dot shape before printing, and setting the dot shape as composite screening: setting the content below 25% as 20 mu frequency modulation net to increase spreading of ink on the paper surface at a light tone part and enlarge the ink reflection surface; the perception of color by vision is improved.

(3.2) setting by a prepress publishing compensation curve: reducing the plate output compensation of CMYK, controlling the dot gain to be 13-15% to increase the image contrast, and increasing the density value of four colors to be C1.45-1.50M 1.50-1.55Y 1.05-1.10K 1.80-1.85; the saturated ink layer helps to expand the gamut range.

(3.3) the published compensation of the Y version at the shallow web tones was corrected for the output data (see table 3 below) using kodak print energy Harmony software to effectively improve the image color at the highlight regions of the document due to paper color problems while ensuring that the gray balance at the tone is in accordance with HC-cmy ═ 0.25.

TABLE 3

(3.4) adding 5% -8% of PANTONE Rhodamine Red into the primary color M ink by adjusting the hue of C M ink; 5% -8% of PANTONE Process Biue is added into the primary color C ink, and the effects are as follows: decreasing the b value of ink, increasing the a value, increasing the L value, and increasing the ink trapping ratio, enriches the color gamut, as shown in table 4 below, for improved four-primary hues.

TABLE 4

(4) The new single-powder card color gamut proof after the printing measures are implemented by using the G7 method:

the G7 method performs CTP curve calibration and print sheet color adjustment to make CMYK meet the requirements of ISO12647-2, and as shown in fig. 2, in order to compare the improved single-powder card printing color gamut with the ISO target color gamut, the printing color gamut is enlarged by more than 25%, and is closer to the standard printing effect.

(5) The new data was used to model:

measuring a color gamut guide table IT8.7/3 on the printed sheet by using Alice-One iSIS;

ICC characteristic files are manufactured by adopting Profile Maker software according to the IT8.7/3 data of the color gamut guide table;

and circularly calibrating the GMG digital proofing system by using the ICC profile to obtain a digital proofing profile, performing digital draft of the single-powder card paper matched with the ISO color gamut on the profile, simulating the paper color of the single-powder card by using the digital draft, and accordingly, following the color by using a printer.

The invention also discloses a standardized color management device of the packaging printing paper, which comprises a standard proof printing module, a comparison proof printing module, a color gamut establishing improvement scheme module, a new proof printing module and a newly-built export module.

The standard proof printing module is used for printing the standard proof.

The comparison proof printing module is used for printing comparison proof.

The formulated color gamut improving scheme module is used for evaluating by combining analysis color gamut difference with PressSIGN software and comprises a prepress setting module, a prepress publishing compensation curve setting module, a data output module and an C M ink hue adjusting module.

The prepress setting module is used for setting the shape of the screen points into a composite screening mode: setting the content below 25% as 20 mu frequency modulation net to increase spreading of ink on the paper surface at a light tone part and enlarge the ink reflection surface; the perception of color by vision is improved.

The prepress publishing compensation curve setting module is used for reducing printing plate output compensation of CMYK, controlling the dot expansion to be 13-15% to increase image contrast, and increasing the density value of four colors to be C1.45-1.50M 1.50-1.55Y 1.05-1.10K 1.80-1.85; the saturated ink layer helps to expand the gamut range.

The data output module uses Kodak Negay Harmony software to compensate and correct the published output data of Y edition in shallow web tone so as to effectively improve the image color of highlight parts of a document caused by paper color problems and ensure that the gray balance in the tone is consistent with HC-cmy being 0.25.

The C M ink hue adjusting module is used for adding PANTONE Rhodamine Red 5% -8% into primary color M ink; 5% -8% of PANTONE Process Biue is added into the primary color C ink.

The new proof printing module is used for performing CTP curve calibration and printed sheet color adjustment by using a G7 method, so that CMYK meets the requirements of ISO 12647-2.

The newly-built derivation module is used for measuring a color gamut derivation table IT8.7/3 on a printed sheet by using Alice-One iSIS; and (4) adopting Profile Maker software to make an ICC Profile according to the data of the color gamut guide table IT 8.7/3.

The design of the invention is characterized in that: by adopting the method and the device, the printing color gamut is enlarged by more than 25 percent and is closer to the standard printing effect, so that the standard draft of a design party can be reproduced in the single-powder-card packaging printing, and the use requirement is met.

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.