CN114393922A - Newspaper printing color management method - Google Patents

Newspaper printing color management method Download PDF

Info

Publication number
CN114393922A
CN114393922A CN202111617491.0A CN202111617491A CN114393922A CN 114393922 A CN114393922 A CN 114393922A CN 202111617491 A CN202111617491 A CN 202111617491A CN 114393922 A CN114393922 A CN 114393922A
Authority
CN
China
Prior art keywords
color
tone
cyan
printing
black
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202111617491.0A
Other languages
Chinese (zh)
Other versions
CN114393922B (en
Inventor
余节约
田培娟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Dianzi University
Hangzhou Dianzi University Wenzhou Research Institute Co Ltd
Original Assignee
Hangzhou Dianzi University
Hangzhou Dianzi University Wenzhou Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Dianzi University, Hangzhou Dianzi University Wenzhou Research Institute Co Ltd filed Critical Hangzhou Dianzi University
Priority to CN202111617491.0A priority Critical patent/CN114393922B/en
Publication of CN114393922A publication Critical patent/CN114393922A/en
Application granted granted Critical
Publication of CN114393922B publication Critical patent/CN114393922B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing
    • B41M1/18—Printing one ink over another

Abstract

The invention discloses a color management method for newspaper printing, which comprises the steps of manufacturing a test plate for test printing, determining primary color reference density according to requirements, and selecting the closest ISO standard curve as a reference to generate a platemaking compensation curve according to the average value of the sum of the step tone increasing values of each step of four primary colors under the current condition. And (5) printing the test plate by using the printing plate after compensation and correction and keeping the reference density unchanged. Creating a characteristic file for color separation according to the color value of the printing obtained by detecting the printed sheet and the tone reproduction characteristic of the selected ISO standard curve, and converting the picture from RGB to CMYK; and according to the chromatic value obtained by detecting the IT8.7/3 test chart, making a characteristic file for soft proofing by using color management software, and simulating a preview printing effect during finishing. The invention can ensure that the printing effect gives consideration to the requirements of brightness and thickness of the header and the title, smooth transition of the gradation level of the image, correct color reproduction and accurate simulation of printing and copying colors by soft proofing.

Description

Newspaper printing color management method
Technical Field
The invention relates to the field of newspaper printing production, in particular to a newspaper printing color management implementation method.
Background
The printing color management means that the color is managed and adjusted in a production system by a method of combining software and hardware according to the color reproduction characteristics determined by paper, ink and other printing conditions, so that the color of a picture original manuscript is optimally reproduced in a printed matter. In order to match the color control of different links in the production process, the international standard ISO12647-3-2013 and the national standard GBT17934-3-2003 respectively standardize the color reproduction characteristics of newspaper printing, including the chromaticity values of primary colors and secondary colors, the tone increase values of four primary colors, and the like. The color management implementation method commonly adopted in the newspaper printing industry is as follows: when the pre-press picture is processed, a standard newsprint printing characteristic file is adopted for color separation, and a tone curve is corrected during plate making, so that the printed tone reproduction characteristics are close to the standard as much as possible; during printing, the amount of the four-color ink of the cyan yellow and the black is adjusted to ensure that the chroma of the primary color and the secondary color is as close to the standard chroma requirement as possible.
The method has the advantages of facilitating the communication between a printer and an advertiser and enabling pictures made by the advertiser to be well copied, but has obvious defects.
In recent years, newspaper pages are greatly shrunk, particularly advertisement pictures are greatly reduced, and the newspaper has more functions of thinking propaganda and current affair transmission. For the header with large red color on the layout and the red or black headline, the prominent visual impact effect is more expected to be achieved, and the CY/T197-2019 newsprint cold setting offset newspaper printing quality evaluation method requires that the density of the black headline of the newspaper is not less than 1.10. If the primary color and the secondary color are controlled according to the current international standard or national standard, the color of the big red header and the black and red headers is not bright and thick enough, which does not accord with the aesthetic habit of domestic readers, and the density of the black header is difficult to meet the quantitative evaluation requirement of not less than 1.10. If the ink amount is automatically increased during printing to make the color of the title more dense, the reproduction characteristics of the printed color are not matched with the color separation before printing, which causes the problems of color cast of picture copying, loss of gradation and the like.
Due to the improvement of the material and the process level, the printing tone increase value specified by the newspaper standard does not accord with the typical printing characteristics of domestic newspaper. The added value of 40% of order is 26.2% according to ISO standard, the added value of actual production is larger according to different production conditions, but most domestic newspapers are printed about 20%, the order copying characteristics are required to be adjusted greatly, and adverse effects are caused on printing performance.
It has also been proposed to produce newspaper print profiles for color separation and proofing directly from the typical print characteristics of the factory, but due to poor stability of newspaper printing, the self-produced profiles are often deficient in smoothness of the tones and in reasonableness of distribution, affecting the effect of image reproduction.
Disclosure of Invention
The invention aims to solve the technical problem of providing a new newspaper printing color management implementation method which is suitable for the current actual requirements and process characteristics, and solves the problem that the ink colors of a header and a title are not bright and thick enough in the existing method under the condition of correct reproduction of pictures; the problem that the prior process usually needs to artificially and greatly improve the contrast increase value and is not beneficial to hierarchical representation is solved; the invention also solves the smoothness requirement of color separation tone copying and the requirement of soft proofing on accurate simulation of printing copying colors by manufacturing two characteristic files.
A method for realizing color management of newspaper printing comprises the following steps:
step 1, manufacturing a digital test board; comprises a header, a black title word, a cyan, magenta, yellow, black, red, green, blue and cyan magenta color-superposed color ribbon, a cyan, magenta, yellow and black four-color step scale and an IT8.7/3 test chart;
step 2, making a printing plate by using the digital test plate under the condition of not carrying out contrast compensation correction;
step 3, adjusting the output ink amount of cyan, magenta, yellow and black to print a test plate, so that the black density is not less than 1.10 and meets the visual evaluation requirement of newspaper agencies on the black subject color, the header color meets the visual evaluation requirement of newspaper agencies, the chroma of the cyan and yellow three-color overprint color is close to the neutral color, and the wet densities of the cyan, magenta, yellow and black colors are recorded;
step 4, detecting the tone value of each step of the cyan, magenta, yellow and black four-color ladder ruler on the printed sheet, calculating the average value of the sum of the tone increasing values of each step of the cyan, magenta, yellow and black four colors, selecting a closest ISO standard tone increasing curve as a reference, and generating a compensation curve for plate making;
step 5, calling the generated plate making compensation curve by using the digital test plate to make the test plate again, and keeping the wet density unchanged for printing again;
step 6, detecting chromatic values of three-color overprinting colors of white paper, cyan, magenta, yellow, black, red, green, blue and cyan yellow after printed sheets are dried, detecting chromatic values of various color blocks of an IT8.7/3 test chart, and creating a printing characteristic file 1 by means of Photoshop software by utilizing the paper, primary color, secondary color, three-color overprinting color chromatic values and the tone copying characteristics of a selected ISO standard curve; creating a printing characteristic file 2 by using chromatic values of all color blocks of an IT8.7/3 test chart and by using color management software;
and 7, converting the picture from the RGB to the CMYK color mode by using the printing characteristic file 1, performing screen soft proofing by using the printing characteristic file 2, correcting the picture under the soft proofing display effect, calling the corrected plate-making compensation curve to make a plate, and controlling the ink amount according to the stored wet density value to perform printing.
Preferably, the scale of four-color tone scale of cyan, magenta, yellow and black of the digital test plate in step 1 comprises 13 gradation levels per color, and the tone values of each level are 0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% and 100%, respectively.
Preferably, the step 4 calculates an average value of the sum of the tone increase values of the steps of cyan, magenta, yellow and black, and selects a closest ISO standard tone increase curve as a reference by: calculating the average value of the sum of the tone increasing values of the cyan, magenta, yellow and black at 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95% steps, and recording as delta FsumThe calculation method comprises the following steps:
Figure RE-GDA0003555653190000021
wherein FC_5、FC_95Respectively indicating the tone values at 5% and 95% steps of a cyan step scale on a test plate printed sheet, FM_5、FM_95Respectively indicating the tone values of 5 percent and 95 percent of the steps of the magenta step ruler on the printed sheet of the test plate, FY_5、FY_95Respectively indicating the tone values of 5 percent and 95 percent of the steps of the yellow step ruler on the printed sheet of the test plate, FK_5、FK_95The tone values of 5 percent and 95 percent of the steps of the black scale on the printed sheet of the test plate are respectively indicated. According to Δ FsumThe value selects an ISO standard tone increase value curve as a reference, and the method comprises the following steps:
(1) if Δ FsumLess than or equal to 126.8 percent, and selecting an A curve of ISO 12647-2;
(2) if 126.8% < Δ FsumLess than or equal to 149.8 percent, and selecting a B curve of ISO 12647-2;
(3) if 149.8% < Δ FsumLess than or equal to 170.1 percent, and selecting a C curve of ISO 12647-2;
(4) if 170.1% < Δ Fsum187.4% or less, and selecting a D curve of ISO 12647-2;
(5) if Δ Fsum> 187.4%, E-curve for ISO12647-2 was chosen.
Preferably, the method for generating the compensation curve for platemaking in step 4 is:
for cyan, at 13 hierarchical levels [0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100% ]on the digital file]Taking the tone value obtained by measuring on the printed sheet at each stage as an independent variable, fitting the relationship between the tone value and the digital file tone value by using a least square method according to a fourth-order polynomial function to obtain a relationship function f between the current cyan printed sheet tone value and the digital file tone valueCThen, in the same way, the relation function f of the tone value of the magenta printed sheet and the tone value of the digital file is obtainedMFunction f relating tone value of yellow printed sheet to tone value of digital documentYFunction f relating tone value of black printed sheet to tone value of digital documentK。
The tone value and the increment value of a selected ISO standard tone increment curve at each step are calculatedAdding to obtain the increased tone value of each step corresponding to the curve as independent variable according to the relation function fC、fM、fY、fKAnd calculating the gradation correction value of each color at each level, inputting the gradation correction value of each level of cyan, magenta, yellow and black by using the dot area correction function of rasterization processing software, and generating the plate making compensation curve of cyan, magenta, yellow and black.
The invention has the beneficial effects that:
1. the invention can realize the requirements of more vivid and thick ink colors of the header and the title on the premise of ensuring the picture copying quality;
2. according to the current tone reproduction characteristics, the closest ISO12647-2 standard tone reproduction characteristics are selected as the reference for making color separation characteristic files and correcting the current tone reproduction characteristics, so that smoothness of tone layers and reasonability of tone distribution during color separation are guaranteed, the current tone reproduction characteristics are prevented from being adjusted greatly, and good level expression is kept;
3. the invention respectively manufactures the characteristic files for color separation to carry out color separation, manufactures the characteristic files for soft proofing to simulate the printing effect, and solves the smoothness requirement of gradation level copying and the requirement of the soft proofing on accurate simulation of printing copying colors.
Drawings
FIG. 1 is a flow chart of a method for implementing color management for newspaper printing;
FIG. 2 is a printing test plate.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings and examples.
A print test version digital file in CMYK mode is made, as shown in fig. 2, the test version layout at least includes the original large header title text, header title text of other layouts, black header text of common specification, cyan, magenta, yellow, black, red, green, blue and cyan product yellow three-color superimposed solid color bar, cyan, magenta, yellow, black four-color gradation step ruler, and IT8.7/3 test chart, etc., wherein the color bar height is 1 cm, the width is slightly less than the width of the printed sheet, each gradation step ruler includes 13 gradation levels, and the gradation values of each level are 0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100%, respectively.
And outputting the printing plate by using the digital file of the test plate under the condition of not carrying out tone compensation correction, and carrying out test printing. Because the CY/T197-2019 newspaper cold-set offset printing newspaper printing quality evaluation method requires that the density of the black title of the newspaper is not less than 1.10, the black output ink amount is adjusted in the printing process, so that the density of the black color bar is not less than 1.10, and the requirement of the newspaper society on the visual evaluation of the black title word is met; the headings of most newspapers are formed by printing magenta and yellow on the spot, the ink color is required to be bright and thick, and the headings are also important parameters for newspaper quality evaluation, and the visual evaluation requirements of newspaper companies on the headings are met by adjusting the output ink amounts of magenta and yellow; and further adjusting the cyan output ink quantity to enable the color of the cyan and yellow three-color overprint color strip to be close to the neutral color. When the header color, the black header color and the overprint color meet the requirements and the ink colors of all the color bars are uniformly distributed along the width direction as much as possible, the wet densities of the cyan, magenta, yellow and black colors are recorded and used as ink amount control reference values for subsequent production and printing, so that the header characters and the headers of newspapers can meet the requirements of newspaper companies on the brightness and the thickness of the ink colors.
Different printing conditions, including different printing ink, paper, printing plate and printing machine, different printing pressure, screening parameters and other processes, are different, the increase range of the tone value in printing is different, but the maximum value of the tone increase in domestic newspaper printing is mostly about 20%, and has a larger difference compared with the newspaper printing tone increase value specified by international standard ISO12647-3, therefore, the tone reproduction characteristic is corrected by taking one of five tone increase value standards specified by ISO12647-2 as a reference instead of taking the ISO12647-3 standard as a fixed reference. ISO12647-2 proposes five different tone increase value criteria from low to high, the closest curve being chosen for different tone increase characteristics under different printing conditions, because: on one hand, the ISO standard curve is a curve with reasonable adjusted tone distribution, which is beneficial to reproduction of each level, and on the other hand, the tone reproduction characteristic under the current printing condition is adjusted as little as possible, so that the requirement of the ISO standard on the tone distribution characteristic can be met.
Detecting the tone value of each step of the cyan, magenta, yellow and black four tones on the printed sheet, calculating the sum of the tone increasing values of the cyan, magenta, yellow and black four tones at 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95% of the steps, and recording as delta FsumThe calculation method comprises the following steps:
Figure RE-GDA0003555653190000051
wherein FC_5、FC_95Respectively indicating the tone values at 5% and 95% steps of a cyan step scale on a test plate printed sheet, FM_5、FM_95Respectively indicating the tone values of 5 percent and 95 percent of the steps of the magenta step ruler on the printed sheet of the test plate, FY_5、FY_95Respectively indicating the tone values of 5 percent and 95 percent of the steps of the yellow step ruler on the printed sheet of the test plate, FK_5、FK_95The tone values of 5 percent and 95 percent of the steps of the black scale on the printed sheet of the test plate are respectively indicated. ISO12647-2-2013 provides the tone increasing values of A, B, C, D, E and other five tone increasing curves at 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% of the steps, calculates the sum of the tone increasing values of the above curves at 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% of the steps to obtain 115.3% of A curve, 138.3% of B curve, 161.2% of C curve, 179% of D curve, 195.8% of E curve, calculates the average value of the sum of the tone increasing values of A and B curves to obtain 126.8%, calculates the average value of the sum of the tone increasing values of B and C curves to obtain 149.8%, calculates the average value of the sum of the tone increasing values of C and D curves to obtain 170.1%, calculates the average value of the sum of the tone increasing values of D and E curves to obtain 187.4%, will be delta FsumRespectively comparing with the average value of the sum of the tone increasing values of every two adjacent curves, and selectingThe closest curve is taken as the reference. The method comprises the following steps:
(1) if Δ FsumSelecting curve A less than or equal to 126.8%;
(2) if 126.8% < Δ FsumLess than or equal to 149.8 percent, and selecting a curve B;
(3) if 149.8% < Δ FsumLess than or equal to 170.1 percent, and selecting a C curve;
(4) if 170.1% < Δ Fsum187.4% or less, selecting D curve;
(5) if Δ Fsum> 187.4%, selecting the E curve;
for cyan, the tone values at 13 hierarchical levels on the digital file [0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100%]Taking the tone value obtained by each level of measurement on the printed sheet as an independent variable, fitting the relationship between the tone value and the digital file tone value by using a least square method according to a fourth-order polynomial function, and obtaining a relationship function f between the tone value of the cyan printed sheet and the digital file tone value under the current printing conditionCThen, by the same method, obtaining the relationship function f between the tone value of the magenta printed sheet and the tone value of the digital file under the current printing conditionMFunction f relating tone value of yellow printed sheet to tone value of digital documentYFunction f relating tone value of black printed sheet to tone value of digital documentK。
Adding the tone value and the added value of the selected ISO standard tone increasing curve at each step to obtain the increased tone value F of each step corresponding to the curvenAs independent variables, according to the relationship function fC、fM、fY、fKGradation correction values at each level for each color are calculated. Wherein FnThe calculation method comprises the following steps:
Fn＝Hn+ΔFn
wherein HnMeans 0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100%]Step value of a certain step, Δ FnAnd indicating the tone increasing value of the selected ISO standard tone increasing curve at the step.
And inputting the tone correction value of each level of cyan, magenta, yellow and black by using the dot area correction function of rasterization processing software to generate tone compensation curves of cyan, magenta, yellow and black versions. Theoretically, after the current printing condition is kept unchanged and the tone reproduction characteristic is corrected by calling the edition tone compensation curve, the tone increase value of the printed matter is exactly equal to the tone increase value of the standard curve selected as the reference.
And (3) utilizing rasterization processing software to re-rasterize the digital file of the test plate under the condition of calling a plate making compensation curve, then manufacturing the printing plate again, keeping the wet density unchanged, printing again, waiting for the dried printed sheet to detect the colorimetric values of a blank part, cyan, magenta, yellow, black, red, green, blue and cyan product yellow overprint colors, and detecting the colorimetric values of various color blocks of the IT8.7/3 test chart.
By utilizing the function of a self-defined CMYK characteristic file of Photoshop, the color value of the overprint colors of white paper, cyan, magenta, yellow, black, red, green, blue and cyan and yellow is increased according to the step tone of each step of an ISO standard curve selected as a referencenAnd creates a print characteristics file 1. The characteristic file takes primary colors, secondary colors and overprint colors under the reference density condition as basic colors, defines the mapping relation between CMYK and chromatic values by combining a selected ISO standard curve, is used for color separation, can ensure that colors under the reference density condition, particularly colors close to the basic colors, are reproduced more correctly, and has smooth gradation transition and reasonable gradation distribution.
The print characteristics file 2 is created from the colorimetric values of the respective color patches of the IT8.7/3 test chart by using color management software such as ProfileMaker or the like. The characteristic file is manufactured according to the actual printing effect under the current condition, is used for proofing, can simulate the actual printing effect more accurately, but is deficient in smooth gradation transition due to poor printing stability of the newspaper.
For the picture in RGB mode, the printing characteristic file 1 is used, the perception reproduction opinion is adopted, the conversion of the picture from RGB to CMYK color mode is carried out, the gradation overall gradation distribution of the picture is kept as reasonable as possible, however, the color gamut of the newspaper is far less than the color gamut of RGB, the printing characteristic file 2 is designated as a device to be simulated in the proof setting, the CMYK value is kept unchanged, the screen soft proofing is carried out according to the reproduction intention of the simulated paper color (namely absolute colorimetry), the picture is corrected under the simulated printing display effect of the soft proofing, and the picture is given up under the condition that the overall color gamut is greatly compressed, and the gradation expression of key parts is emphasized. And after the picture is corrected, the plate making compensation curve is used for plate making, and the ink amount is controlled according to the stored wet density value for printing, so that the printing effect that the header and the title are bright and thick in ink color, and meanwhile, the image is rich in layers and smooth in gradation transition can be realized.
While the preferred embodiments and principles of this invention have been described in detail, it will be apparent to those skilled in the art that variations may be made in the embodiments based on the teachings of the invention and such variations are considered to be within the scope of the invention.

Claims (4)

1. A method of color management for newspaper printing, the method comprising the steps of:
step 1, manufacturing a digital test board; comprises a header, a black title word, a cyan, magenta, yellow, black, red, green, blue and cyan magenta color-superposed color ribbon, a cyan, magenta, yellow and black four-color step scale and an IT8.7/3 test chart;
step 2, making a printing plate by using the digital test plate under the condition of not carrying out contrast compensation correction;
step 3, adjusting the output ink amount of cyan, magenta, yellow and black to print a test plate, so that the black density is not less than 1.10 and meets the visual evaluation requirement of newspaper agencies on the black subject color, the header color meets the visual evaluation requirement of newspaper agencies, the chroma of the cyan and yellow three-color overprint color is close to the neutral color, and the wet densities of the cyan, magenta, yellow and black colors are recorded;
step 4, detecting the tone value of each step of the cyan, magenta, yellow and black four-color ladder ruler on the printed sheet, calculating the average value of the sum of the tone increasing values of each step of the cyan, magenta, yellow and black four colors, selecting a closest ISO standard tone increasing curve as a reference, and generating a compensation curve for plate making;
step 5, calling the generated plate making compensation curve by using the digital test plate to make the test plate again, and keeping the wet density unchanged for printing again;
step 6, detecting chromatic values of three-color overprinting colors of white paper, cyan, magenta, yellow, black, red, green, blue and cyan yellow after printed sheets are dried, detecting chromatic values of various color blocks of an IT8.7/3 test chart, and creating a printing characteristic file 1 by means of Photoshop software by utilizing the paper, primary color, secondary color, three-color overprinting color chromatic values and the tone copying characteristics of a selected ISO standard curve; creating a printing characteristic file 2 by using chromatic values of all color blocks of an IT8.7/3 test chart and by using color management software;
and 7, converting the picture from the RGB to the CMYK color mode by using the printing characteristic file 1, performing screen soft proofing by using the printing characteristic file 2, correcting the picture under the soft proofing display effect, calling the corrected plate-making compensation curve to make a plate, and controlling the ink amount according to the stored wet density value to perform printing.
2. The method of claim 1, wherein the digital test plate has four tone scales of cyan, magenta, yellow and black, each color comprising 13 gradation levels, and the tone values of each level are 0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% and 100%, respectively.
3. The method for color management of newspaper printing as set forth in claim 1 wherein the step 4 calculates the average value of the sum of the tone increase values of the steps of cyan, magenta, yellow and black, and the method of selecting a closest ISO standard tone increase curve as a reference is: calculating the average value of the sum of the tone increasing values of the cyan, magenta, yellow and black at 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95% steps, and recording as delta FsumThe calculation method comprises the following steps:
Figure FDA0003436978620000011
wherein FC_5、FC_95Respectively indicating the tone values at 5% and 95% steps of a cyan step scale on a test plate printed sheet, FM_5、FM_95Respectively indicating the tone values of 5 percent and 95 percent of the steps of the magenta step ruler on the printed sheet of the test plate, FY_5、FY_95Respectively indicating the tone values of 5 percent and 95 percent of the steps of the yellow step ruler on the printed sheet of the test plate, FK_5、FK_95Respectively indicating the tone values of 5 percent and 95 percent of the steps of the black ladder ruler on the printed sheet of the test plate; according to Δ FsumThe value selects an ISO standard tone increase value curve as a reference, and the method comprises the following steps:
(1) if Δ FsumLess than or equal to 126.8 percent, and selecting an A curve of ISO 12647-2;
(2) if 126.8% < Δ FsumLess than or equal to 149.8 percent, and selecting a B curve of ISO 12647-2;
(3) if 149.8% < Δ FsumLess than or equal to 170.1 percent, selecting the C curve of IS 012647-2;
(4) if 170.1% < Δ Fsum187.4% or less, selecting the D curve of IS 012647-2;
(5) if Δ Fsum> 187.4%, E curve of IS012647-2 was selected.
4. A method of color management in newspaper printing as set forth in claim 1 wherein the step 4 of generating the compensation curve for plate making is by:
for cyan, at 13 hierarchical levels [0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100% ]on the digital file]Taking the tone value obtained by measuring on the printed sheet at each stage as an independent variable, fitting the relationship between the tone value and the digital file tone value by using a least square method according to a fourth-order polynomial function to obtain a relationship function f between the current cyan printed sheet tone value and the digital file tone valueCThen, in the same way, the relation function f of the tone value of the magenta printed sheet and the tone value of the digital file is obtainedMCorrelation between tone value of yellow printed sheet and tone value of digital fileSystem function fYFunction f relating tone value of black printed sheet to tone value of digital documentK；
Adding the tone value and the added value of the selected ISO standard tone increasing curve at each step to obtain the increased tone value of each step corresponding to the curve as an independent variable according to a relation function fC、fM、fY、fKAnd calculating the gradation correction value of each color at each level, inputting the gradation correction value of each level of cyan, magenta, yellow and black by using the dot area correction function of rasterization processing software, and generating the plate making compensation curve of cyan, magenta, yellow and black.
CN202111617491.0A 2021-12-27 2021-12-27 Color management method for newspaper printing Active CN114393922B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111617491.0A CN114393922B (en) 2021-12-27 2021-12-27 Color management method for newspaper printing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111617491.0A CN114393922B (en) 2021-12-27 2021-12-27 Color management method for newspaper printing

Publications (2)

Publication Number Publication Date
CN114393922A true CN114393922A (en) 2022-04-26
CN114393922B CN114393922B (en) 2023-09-29

Family

ID=81228402

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111617491.0A Active CN114393922B (en) 2021-12-27 2021-12-27 Color management method for newspaper printing

Country Status (1)

Country Link
CN (1) CN114393922B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114905851A (en) * 2022-07-15 2022-08-16 浙江工业大学 Method for collecting printing color density characteristic curve

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5493321A (en) * 1993-02-25 1996-02-20 Minnesota Mining And Manufacturing Company Method and apparatus of characterization for photoelectric color proofing systems
JP2000211112A (en) * 1999-01-27 2000-08-02 Mitsubishi Heavy Ind Ltd Printing quality evaluating method and apparatus therefor
JP2003136683A (en) * 2001-10-31 2003-05-14 Fuji Photo Film Co Ltd System and method for management of printing color
US20050018024A1 (en) * 2003-07-25 2005-01-27 Sommer Fay M. Ink set with expanded color gamut and process for using same
US20070201061A1 (en) * 2006-02-28 2007-08-30 Ernest Daniel Miller Color management of digital files and images for printing
EP1862307A2 (en) * 2006-06-02 2007-12-05 Heidelberger Druckmaschinen Aktiengesellschaft Method for calculating correction values in the colour control or colour adjustment for a printing press
JP2008081610A (en) * 2006-09-27 2008-04-10 Toyo Ink Mfg Co Ltd Offset ink printing method
JP2008254248A (en) * 2007-04-02 2008-10-23 Toyo Ink Mfg Co Ltd Lithographic ink composition
US20090027705A1 (en) * 2006-01-31 2009-01-29 Mitsubishi Heavy Industries, Ltd Pre-printing confirmation method and apparatus of picture color tone for printing press, plate making method, and picture color tone controlling method and apparatus for printing press
US20100195122A1 (en) * 2009-02-03 2010-08-05 Kritchman Eliahu M Method and system for building painted three-dimensional objects
CN102642416A (en) * 2012-04-19 2012-08-22 长沙理工大学 Method for increasing color gamut value of printing ink
CN103057289A (en) * 2013-01-12 2013-04-24 云南省印刷技术研究所 High-precision offset printing method
CN106541702A (en) * 2016-10-27 2017-03-29 杭州电子科技大学 A kind of printing quality corrects system and method
CN106585090A (en) * 2016-11-24 2017-04-26 杭州电子科技大学 Detection and correction method for printing dot area increase values
CN107757166A (en) * 2017-10-23 2018-03-06 深圳当纳利印刷有限公司 A kind of color management method and device for maximizing uncoated paper printing colour gamut
CN110021048A (en) * 2019-03-22 2019-07-16 杭州电子科技大学上虞科学与工程研究院有限公司 A kind of mass colour evaluation method of newspaper printing
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
CN111761955A (en) * 2020-07-02 2020-10-13 深圳当纳利印刷有限公司 Standardized color management method and device for packaging printing paper

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5493321A (en) * 1993-02-25 1996-02-20 Minnesota Mining And Manufacturing Company Method and apparatus of characterization for photoelectric color proofing systems
JP2000211112A (en) * 1999-01-27 2000-08-02 Mitsubishi Heavy Ind Ltd Printing quality evaluating method and apparatus therefor
JP2003136683A (en) * 2001-10-31 2003-05-14 Fuji Photo Film Co Ltd System and method for management of printing color
US20050018024A1 (en) * 2003-07-25 2005-01-27 Sommer Fay M. Ink set with expanded color gamut and process for using same
US20090027705A1 (en) * 2006-01-31 2009-01-29 Mitsubishi Heavy Industries, Ltd Pre-printing confirmation method and apparatus of picture color tone for printing press, plate making method, and picture color tone controlling method and apparatus for printing press
US20070201061A1 (en) * 2006-02-28 2007-08-30 Ernest Daniel Miller Color management of digital files and images for printing
EP1862307A2 (en) * 2006-06-02 2007-12-05 Heidelberger Druckmaschinen Aktiengesellschaft Method for calculating correction values in the colour control or colour adjustment for a printing press
JP2008081610A (en) * 2006-09-27 2008-04-10 Toyo Ink Mfg Co Ltd Offset ink printing method
JP2008254248A (en) * 2007-04-02 2008-10-23 Toyo Ink Mfg Co Ltd Lithographic ink composition
US20100195122A1 (en) * 2009-02-03 2010-08-05 Kritchman Eliahu M Method and system for building painted three-dimensional objects
CN102642416A (en) * 2012-04-19 2012-08-22 长沙理工大学 Method for increasing color gamut value of printing ink
CN103057289A (en) * 2013-01-12 2013-04-24 云南省印刷技术研究所 High-precision offset printing method
CN106541702A (en) * 2016-10-27 2017-03-29 杭州电子科技大学 A kind of printing quality corrects system and method
CN106585090A (en) * 2016-11-24 2017-04-26 杭州电子科技大学 Detection and correction method for printing dot area increase values
CN107757166A (en) * 2017-10-23 2018-03-06 深圳当纳利印刷有限公司 A kind of color management method and device for maximizing uncoated paper printing colour gamut
CN110021048A (en) * 2019-03-22 2019-07-16 杭州电子科技大学上虞科学与工程研究院有限公司 A kind of mass colour evaluation method of newspaper printing
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
CN111761955A (en) * 2020-07-02 2020-10-13 深圳当纳利印刷有限公司 Standardized color management method and device for packaging printing paper

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
姜昊;余节约;: "适用于报纸印刷的特性文件制作", 广东印刷, no. 02 *
莫灿婷;余节约;: "报纸印刷的色彩管理", 印刷技术, no. 13 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114905851A (en) * 2022-07-15 2022-08-16 浙江工业大学 Method for collecting printing color density characteristic curve
CN114905851B (en) * 2022-07-15 2022-11-11 浙江工业大学 Method for collecting characteristic curve of printing color density

Also Published As

Publication number Publication date
CN114393922B (en) 2023-09-29

Similar Documents

Publication Publication Date Title
US5710824A (en) System to improve printer gamut
US5305119A (en) Color printer calibration architecture
EP0653879B1 (en) Method of and system for predicting a colour reproduction image
US7032517B2 (en) Method for the reproduction of spot colors with primary printing inks and secondary printing inks
US7321448B2 (en) Color proofing method and apparatus, and recorded medium on which color proofing program is recorded
JP5858843B2 (en) Gray balance correction method for printing process
JP4795643B2 (en) Printing preparation method in the pre-printing stage
WO2000042764A1 (en) Color correcting method
CN111761955B (en) Standardized color management method and device for packaging printing paper
JPH0326820B2 (en)
EP1156666B1 (en) Color-balanced TRC correction to compensate for illuminant changes in printer characterization
JP3691322B2 (en) Color correction method
US7411696B2 (en) Smooth gray component replacement strategy that utilizes the full device gamut
CN102218901A (en) Gray balance correction of a printing process
CN114393922B (en) Color management method for newspaper printing
US20070285679A1 (en) Image processing apparatus, image processing method and image processing program
JPH11187278A (en) Method and device for correcting print gradation
EP1412865A2 (en) System admixture compensation system and method
CN112040088B (en) Correction method for analog equipment characteristic file for proofing
Johnson Methods for characterizing colour printers
US20030072473A1 (en) Method to determine a characteristic of a printing system
US7813014B2 (en) Method of adapting a printing process while maintaining black build-up
JPH08223433A (en) Color image processing method
JP2000013627A (en) Color converting method
CN109886902B (en) Printing plate making color separation method of black and white image based on three-color black

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant