CN114393922B - Color management method for newspaper printing - Google Patents
Color management method for newspaper printing Download PDFInfo
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- CN114393922B CN114393922B CN202111617491.0A CN202111617491A CN114393922B CN 114393922 B CN114393922 B CN 114393922B CN 202111617491 A CN202111617491 A CN 202111617491A CN 114393922 B CN114393922 B CN 114393922B
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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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- 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 testing and printing by manufacturing a test plate, determining primary color reference density according to requirements, and selecting the nearest ISO standard curve as a reference to generate a plate-making compensation curve according to the average value of the sum of the step tone increment values of four primary colors under the current condition. And (3) using the printing plate after compensation and correction to keep the reference density unchanged, and printing the test plate. Creating a characteristic file for color separation according to the chromatic value of the ink obtained by detecting the printed sheet and the tone copying characteristics of the selected ISO standard curve, and converting the picture from RGB to CMYK; and according to the chromaticity value obtained by detecting the IT8.7/3 test chart, utilizing color management software to manufacture a characteristic file for soft proofing, and simulating and previewing the printing effect during the chart repairing. The invention can make the printing effect compatible with the bright and thick header and title, smooth gradation level transition of the image, correct color reproduction and the requirement of soft proofing on accurate simulation of printing copy colors.
Description
Technical Field
The invention relates to the field of newspaper printing production, in particular to a color management implementation method for newspaper printing.
Background
The printing color management refers to the color reproduction characteristics determined according to paper, ink and other printing conditions, and the method of combining software and hardware is used for managing and adjusting the colors in a production system so that the colors of the photo manuscript can be optimally reproduced in a printed matter. In order to match the control of different links in the production flow to the color, the international standard ISO12647-3-2013 and the national standard GBT17934-3-2003 respectively normalize the color reproduction characteristics of newspaper printing, including the chromaticity values of primary colors and secondary colors, the tone increment values of four primary colors, and the like. The color management implementation method commonly adopted in the newspaper industry is as follows: when the pre-printing picture is processed, a standard newsprint printing characteristic file is adopted to carry out color separation, and a tone curve is corrected during plate making, so that the printed tone copying characteristics are approximate to the standard as much as possible; the amount of the yellow and black four-color ink of the green product is adjusted during printing, so that the chromaticity of the primary color and the intermediate color is as close to the standard chromaticity requirement as possible.
The method has the advantages of facilitating communication between the printer and the advertiser, enabling pictures produced by the advertiser to be well copied, and obvious defects exist.
In recent years, newspaper layouts are greatly shrunken, particularly advertisement pictures are greatly reduced, and more newspapers return to the functions of political publicity and newsletter propagation. For a reddish header on a layout and a reddish or black large title, a striking visual impact effect is more expected to be achieved, and the CY/T197-2019 newsprint coldset offset newspaper printing quality evaluation method requires that the density of the newspaper black title is not less than 1.10. If the primary colors and the secondary colors are required to be controlled according to the current international standard or national standard, the colors of the scarlet header, the black header and the red header are not bright and thick enough, the aesthetic habit of domestic readers is not met, and the density of the black header is difficult to meet the quantitative evaluation requirement of not less than 1.10. If the ink quantity is increased by oneself during printing, so that the title color is thicker, the reproduction characteristics of the printing color are not matched with the color separation before printing, and the problems of color shift, layer loss and the like of picture copying are caused.
Due to the improvement of materials and technology level, the increased value of the printing tone specified by the newspaper industry standard is not in accordance with the typical printing characteristics of domestic newspaper industry. The ISO standard prescribes that the added value at 40% of the tone is 26.2%, the added value in actual production is larger depending on different deviations of production conditions, but most of domestic newspaper printing is about 20%, the tone copying characteristics are often required to be manually adjusted to a large extent, and the printing performance effect is adversely affected.
It has also been proposed to make newspaper print profiles for color separation and proofing directly from typical print features in the factory, but due to poor stability of newspaper printing, homemade profiles often suffer from defects in tone smoothness and distribution rationality, affecting picture copying.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel newspaper printing color management implementation method which meets the current actual demands and process characteristics, and solves the problems that the ink color of a header and a title is not bright and thick enough under the condition that the picture is correctly reproduced by the existing method; the problem that the existing process is difficult to realize due to the fact that the tone increment value is required to be artificially and greatly increased is solved; the invention also solves the requirements of both the smoothness requirement of color separation tone copying and the requirement of soft proofing on the accurate simulation of printing copying colors by manufacturing two characteristic files.
A method for implementing color management for newspaper printing, the method comprising the steps of:
step 1, manufacturing a digital test board; the ink comprises a header, black inscription, three-color overlapping color bands of cyan, magenta, yellow, black, red, green, blue and cyan, magenta, yellow and black, a tone scale of four colors and an IT8.7/3 test chart;
step 2, manufacturing a printing plate by using the digital test plate under the condition of not performing tone compensation correction;
step 3, adjusting the output ink quantity printing test plate of cyan, magenta, yellow and black to ensure that the black density is not less than 1.10 and meets the visual evaluation requirement of a newspaper company on black title color, ensuring that the header color meets the visual evaluation requirement of the newspaper company, ensuring that the chroma of the cyan, magenta, yellow and black overlapping ink is close to neutral color, and recording the wet densities of the cyan, magenta, yellow and black;
step 4, detecting tone values of steps of the four-color ladder ruler for printing Zhang Shangqing, magenta, yellow and black, calculating an average value of the sum of tone increasing values of the steps for cyan, magenta, yellow and black, and selecting a nearest ISO standard tone increasing curve as a reference to generate a compensation curve for plate making;
step 5, using the digital test plate, calling the generated plate-making compensation curve to manufacture the test plate again, and printing again while keeping the wet density unchanged;
step 6, detecting chromaticity values of white paper, cyan, magenta, yellow, black, red, green, blue and cyan, yellow, respectively, and detecting chromaticity values of all color blocks of the IT8.7/3 test chart, and creating a printing characteristic file 1 by using the photohop software by using chromaticity values of paper, primary colors, secondary colors and three overprinting colors and tone reproduction characteristics of the selected ISO standard curve; creating a printing characteristic file 2 by means of color management software by utilizing the chromaticity values of each color block of the IT8.7/3 test chart;
and 7, converting the picture from RGB to CMYK color modes 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, and calling the corrected plate making compensation curve to make plate, and controlling the ink quantity according to the stored wet density value to print.
Preferably, the four-color tone scale of the digital test board in step 1 comprises 13 gradation levels for each color, and the tone value of each level is 0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100%, respectively.
Preferably, the method for calculating the average value of the sum of the step tone increasing values of the four colors of cyan, magenta, yellow and black in the step 4, and selecting the nearest ISO standard tone increasing curve as the reference is as follows: the average value of the sum of the tone increment values of the four colors cyan, magenta, yellow, and black at 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 95% steps was calculated and denoted as Δf sum The calculation method comprises the following steps:
wherein F is C_5 、F C_95 Respectively refers to the step adjustment values at 5% and 95% of the steps of the cyan ladder ruler on the test plate printing sheet, F M_5 、F M_95 Respectively refers to the step adjustment values at 5% and 95% of the step positions of the magenta ladder ruler on the test plate printing sheet, F Y_5 、F Y_95 Respectively refers to the step adjustment values of 5% and 95% of the yellow ladder ruler on the test plate printing sheet, F K_5 、F K_95 The step adjustment values at 5% and 95% steps of the black ladder ruler on the test plate printing sheet are respectively referred to. Then according to DeltaF sum The value selects an ISO standard tone increment value curve as a reference, and the method comprises the following steps:
(1) If DeltaF sum The A curve of ISO12647-2 is selected and is less than or equal to 126.8 percent;
(2) If 126.8% < ΔF sum A B curve of ISO12647-2 is selected and is less than or equal to 149.8 percent;
(3) If 149.8% < ΔF sum C curve of ISO12647-2 is selected and is less than or equal to 170.1%;
(4) If 170.1% < ΔF sum A D curve of ISO12647-2 is selected which is less than or equal to 187.4 percent;
(5) If DeltaF sum 187.4%, E curve of ISO12647-2 was chosen.
Preferably, the method for generating the compensation curve for plate making in the step 4 is as follows:
for cyan, at 13 hierarchical levels [0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100% on a digital file]As a dependent variable, using the tone value obtained by measurement on each printed sheet as an independent variable, and using a least square method to fit the relation between the tone value of the current cyan printing Zhang Jie and the tone value of the digital file according to a fourth-order polynomial function to obtain a relation function f between the tone value of the current cyan printing Zhang Jie and the tone value of the digital file C Obtaining a relation function f between the tone value of the magenta print Zhang Jie and the tone value of the digital file by the same method M Tone value relation function f of yellow seal Zhang Jie tone value and digital file Y Tone value relation function f of black seal Zhang Jie tone value and digital file K 。
Adding the tone value and the increment value of each step of the selected ISO standard tone increment curve to obtain the tone value of each step increment corresponding to the curve as an independent variable, and respectively according to the relation function f C 、f M 、f Y 、f K Calculating the tone correction value of each color at each stage, and inputting cyan, magenta, etc. by using the dot area correction function of the rasterizing software,And generating plate-making compensation curves of cyan, magenta, yellow and black by using the tone correction value of each level of 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 present invention, a closest ISO12647-2 standard tone replication feature is selected as a reference according to the present tone replication feature, and is used for making a color separation characteristic file, and correcting the present tone replication feature, so that smoothness of tone gradation and rationality of tone distribution during color separation are ensured, and great adjustment of the present tone replication feature is avoided, thereby being beneficial to maintaining good gradation expression;
3. according to the invention, the characteristic files for color separation are manufactured respectively to perform color separation, and the characteristic files for soft proofing are manufactured to simulate the printing effect, so that the requirements of smoothness of tone level copying and the requirements of soft proofing on accurate simulation of printing and copying colors are solved.
Drawings
FIG. 1 is a flow chart of a method of implementing color management for newspaper printing;
fig. 2 is a printing test plate.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
A printing test board digital file in CMYK mode is produced, as shown in figure 2, the test board layout at least comprises original large header words, header words of other boards, black header words of common specifications, cyan, magenta, yellow, black, red, green, blue and cyan yellow three-color overlapping color solid color bars, cyan, magenta, yellow, black four-color tone step bars, IT8.7/3 test patterns and the like, wherein the height of the color bars is 1 cm, the width is slightly smaller than the width of a printed sheet, each color tone step bar comprises 13 gradation levels, and the tone values of each gradation level are respectively 0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% and 100%.
And outputting the printing plate by using the test version digital file under the condition of not performing tone compensation correction, and performing test printing. Because the CY/T197-2019 newsprint cold setting offset newspaper printing quality evaluation method requires that the density of the newspaper black titles is not less than 1.10, the black output ink quantity is regulated in the printing process, so that the density of black stripes is not less than 1.10, and the visual evaluation requirement of a newspaper society on black title words is met; most of newspaper header marks are formed by overlapping magenta and yellow in the field, the ink color is required to be bright and thick, the newspaper header marks are also important parameters for evaluating the quality of the newspaper, and the visual evaluation requirement of a newspaper agency on the header color is met by adjusting the output ink quantity of magenta and yellow; and further adjusting the output ink quantity of the cyan, so that the color of the cyan and yellow three-color overlapped ink color stripes is close to neutral. When the header color, the black mark subject color and the overprint color meet the requirements, and after the ink colors of all 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 the ink quantity control reference value for the subsequent production printing, so that the header subject word and the title of the newspaper can meet the requirements of newspaper society on vividness and solidness of the ink colors.
Different printing conditions, including different printing ink, paper, printing plate, printing machine and different processes such as printing pressure, screening parameters, etc., the increasing amplitude of the tone value is different, but the maximum value of the tone increase of the domestic newspaper printing is about 20%, and compared with the newspaper printing tone increasing value specified by the international standard ISO12647-3, the invention uses one of five tone increasing value standards specified by ISO12647-2 as a standard instead of using the standard ISO12647-3 as a fixed standard to correct tone copying characteristics. ISO12647-2 proposes five different tone increment value criteria from low to high, selecting the closest curve for different tone increment features under various different printing conditions, the reason for this being: on one hand, the ISO standard curve is a curve with reasonable tone distribution after adjustment, which is beneficial to reproduction of each layer, and on the other hand, the tone copying characteristic under the current printing condition is adjusted as little as possible, so that the tone distribution characteristic requirement of the ISO standard can be met.
Detection stamp Zhang Shangqing and productThe tone value of each step of the red, yellow and black four-color tone is calculated, and the sum of the tone increment values of the green, magenta, yellow and black four-color at 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95% steps is recorded as DeltaF sum The calculation method comprises the following steps:
wherein F is C_5 、F C_95 Respectively refers to the step adjustment values at 5% and 95% of the steps of the cyan ladder ruler on the test plate printing sheet, F M_5 、F M_95 Respectively refers to the step adjustment values at 5% and 95% of the step positions of the magenta ladder ruler on the test plate printing sheet, F Y_5 、F Y_95 Respectively refers to the step adjustment values of 5% and 95% of the yellow ladder ruler on the test plate printing sheet, F K_5 、F K_95 The step adjustment values at 5% and 95% steps of the black ladder ruler on the test plate printing sheet are respectively referred to. ISO12647-2-2013 provides A, B, C, D, E steps of five steps of 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% steps, calculating the sum of steps of 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95% steps of each of the above curves to obtain 115.3% for the A curve, 138.3% for the B curve, 161.2% for the C curve, 179% for the D curve, 195.8% for the E curve, calculating the average of the sum of steps of A and B curves to obtain 126.8% for the B curve, calculating the average of the sum of steps of B and C curves to obtain 149.8%, calculating the average of the sum of steps of C and D curves to obtain 170.1%, calculating the average of the sum of steps of D and E curves to obtain 187.4%, and ΔF sum And respectively comparing the two adjacent curves with the average value of the step increment values of the two adjacent curves, and selecting the nearest curve as a reference. The method comprises the following steps:
(1) If DeltaF sum A curve A is selected, wherein the value is less than or equal to 126.8%;
(2) If 126.8% < ΔF sum Selecting a B curve, wherein the B curve is less than or equal to 149.8%;
(3) If 149.8% < ΔF sum Selecting a C curve, wherein the C curve is less than or equal to 170.1%;
(4) If 170.1% < ΔF sum A D curve is selected, wherein the D curve is less than or equal to 187.4%;
(5) If DeltaF sum > 187.4%, select E curve;
tone values [0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100% for cyan at 13 hierarchical levels on a digital file]The tone value obtained by each stage measurement on the printed sheet is taken as an independent variable as a dependent variable, and the relationship between the tone value of the cyan print Zhang Jie and the tone value of the digital file is fitted according to a fourth-order polynomial function by using a least square method to obtain a relationship function f between the tone value of the cyan print Zhang Jie and the tone value of the digital file under the current printing condition C Obtaining a relation function f of the tone value of the magenta print Zhang Jie and the tone value of the digital file under the current printing condition by the same method M Tone value relation function f of yellow seal Zhang Jie tone value and digital file Y Tone value relation function f of black seal Zhang Jie tone value and digital file K 。
Adding the tone value and the increment value of each step of the selected ISO standard tone increment curve to obtain a tone value F after each step corresponding to the curve is increased n As independent variables, according to the relation function f C 、f M 、f Y 、f K The gradation correction value at each level is calculated for each color. Wherein F is n The calculation method of (1) is as follows:
F n ＝H n +ΔF n
wherein H is n Finger [0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100 ]]Tone value of a step, Δf n Refers to the tone increment value of the selected ISO standard tone increment curve at the step.
And inputting tone correction values of each level of cyan, magenta, yellow and black by utilizing the dot area correction function of the rasterization processing software to generate tone compensation curves of the cyan, magenta, yellow and black plates. In theory, the current printing condition is kept unchanged, and after the tone replication sign is corrected by calling the edition tone compensation curve, the tone increment value of the printed matter is exactly equal to the tone increment value of the standard curve selected as the reference.
And (3) re-rasterizing the test version digital file under the condition of calling a plate-making compensation curve by utilizing rasterizing processing software, then manufacturing a printing plate again, keeping the wet density unchanged, printing again, drying the printing plate, detecting the chromaticity values of three-color overlapping colors of blank parts, cyan, magenta, yellow, black, red, green, blue and cyan, and detecting the chromaticity values of each color block of the IT8.7/3 test chart.
By utilizing the function of a customized CMYK characteristic file of Photoshop, according to the chromaticity values of white paper, cyan, magenta, yellow, black, red, green, blue and cyan, yellow, and the value F after each step tone increment of an ISO standard curve serving as a reference is selected n A print profile 1 is created. The characteristic file takes primary colors, intermediate colors and overprinting colors under the condition of reference density as basic colors, defines the mapping relation between CMYK and chromaticity values by combining with a selected ISO standard curve, and can enable colors under the condition of reference density, particularly colors close to the basic colors, to be reproduced more correctly, and has smooth tone transition and reasonable hierarchical distribution.
Print profile 2 is created from the individual color block colorimetric values of the IT8.7/3 test chart using color management software such as ProfileMaker, etc. The characteristic file is manufactured according to the actual printing effect under the current condition, is used for proofing, can more accurately simulate the actual printing effect, but has poor stability of newspaper printing and has poor tone transition smoothness.
For the picture in RGB mode, the picture is converted from RGB to CMYK color mode by using the perception reproduction opinion by using the printing characteristic file 1, so that the whole gradation distribution of the picture is reasonably reserved as far as possible, but the color gamut of the newspaper is far less than that of RGB, the printing characteristic file 2 is designated as equipment to be simulated in the proofing setting, CMYK value is unchanged, the screen soft proofing is carried out by using the reproduction intention of the simulated paper color (absolute colorimetric), and the picture is corrected under the simulation printing display effect of the soft proofing, so that the gradation expression of the key position is emphasized to some extent under the condition that the whole color gamut is greatly compressed. After the picture is corrected, plate making compensation curve is used for plate making, and the ink quantity is controlled to print according to the stored wet density value, so that the printing effects of bright and thick ink color of the header and the header, rich image gradation and smooth tone transition can be achieved.
While the foregoing has been with reference to the preferred embodiments and principles of the present invention, it will be apparent to those skilled in the art that changes in this embodiment may be made without departing from the principles of the invention.
Claims (2)
1. A method of color management for newspaper printing, the method comprising the steps of:
step 1, manufacturing a digital test board; the ink comprises a header, black inscription, three-color overlapping color bands of cyan, magenta, yellow, black, red, green, blue and cyan, magenta, yellow and black, a tone scale of four colors and an IT8.7/3 test chart;
step 2, manufacturing a printing plate by using the digital test plate under the condition of not performing tone compensation correction;
step 3, adjusting the output ink quantity printing test plate of cyan, magenta, yellow and black to ensure that the black density is not less than 1.10 and meets the visual evaluation requirement of a newspaper company on black title color, ensuring that the header color meets the visual evaluation requirement of the newspaper company, ensuring that the chroma of the cyan, magenta, yellow and black overlapping ink is close to neutral color, and recording the wet densities of the cyan, magenta, yellow and black;
step 4, detecting the tone value of each step of the four-color ladder ruler for printing Zhang Shangqing, magenta, yellow and black,
the average value of the sum of the tone increment values of the four colors cyan, magenta, yellow, and black at 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 95% steps was calculated and denoted as Δf sum The calculation method comprises the following steps:
wherein F is C_5 、F C_95 Respectively refers to the step adjustment values at 5% and 95% of the steps of the cyan ladder ruler on the test plate printing sheet, F M_5 、F M_95 Respectively refers to the step adjustment values at 5% and 95% of the step positions of the magenta ladder ruler on the test plate printing sheet, F Y_5 、F Y_95 Respectively refers to the step adjustment values of 5% and 95% of the yellow ladder ruler on the test plate printing sheet, F K_5 、F K_95 Respectively referring to step adjustment values at 5% and 95% of the steps of the black ladder ruler on the test plate printing sheet; then according to DeltaF sum The value selects an ISO standard tone increment value curve as a reference, and the method comprises the following steps:
(1) If DeltaF sum The A curve of ISO12647-2 is selected and is less than or equal to 126.8 percent;
(2) If 126.8%<ΔF sum A B curve of ISO12647-2 is selected and is less than or equal to 149.8 percent;
(3) If 149.8%<ΔF sum C curve of ISO12647-2 is selected and is less than or equal to 170.1%;
(4) If 170.1%<ΔF sum A D curve of ISO12647-2 is selected which is less than or equal to 187.4 percent;
(5) If DeltaF sum >187.4%, E curve of ISO 12647-2;
for cyan, at 13 hierarchical levels [0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 100% on a digital file]As a dependent variable, using the tone value obtained by measurement on each printed sheet as an independent variable, and using a least square method to fit the relation between the tone value of the current cyan printing Zhang Jie and the tone value of the digital file according to a fourth-order polynomial function to obtain a relation function f between the tone value of the current cyan printing Zhang Jie and the tone value of the digital file C Obtaining a relation function f between the tone value of the magenta print Zhang Jie and the tone value of the digital file by the same method M Tone value relation function f of yellow seal Zhang Jie tone value and digital file Y Tone value relation function f of black seal Zhang Jie tone value and digital file K ；
Adding the tone value and the increment value of each step of the selected ISO standard tone increment curve to obtain the tone value of each step increment corresponding to the curve as an independent variable, and respectively according to the relation function f C 、f M 、f Y 、f K Calculating the tone correction value of each color at each level, and then inputting the tone correction value of each level of each color of cyan, magenta, yellow and black by utilizing the dot area correction function of the rasterization processing software to generate plate-making compensation curves of the cyan, magenta, yellow and black;
step 5, using the digital test plate, calling the generated plate-making compensation curve to manufacture the test plate again, and printing again while keeping the wet density unchanged;
step 6, detecting chromaticity values of white paper, cyan, magenta, yellow, black, red, green, blue and cyan, yellow, respectively, and detecting chromaticity values of all color blocks of the IT8.7/3 test chart, and creating a printing characteristic file 1 by using the photohop software by using chromaticity values of paper, primary colors, secondary colors and three overprinting colors and tone reproduction characteristics of the selected ISO standard curve; creating a printing characteristic file 2 by means of color management software by utilizing the chromaticity values of each color block of the IT8.7/3 test chart;
and 7, converting the picture from RGB to CMYK color modes 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, and calling the corrected plate making compensation curve to make plate, and controlling the ink quantity according to the stored wet density value to print.
2. The method of claim 1, wherein the four-tone scale of cyan, magenta, yellow, and black of the digital test board of step 1 comprises 13 gradation levels, and the gradation values of each level are 0, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, and 100%, respectively.
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