CN110021048B - Ink color evaluation method for newspaper printing - Google Patents

Ink color evaluation method for newspaper printing Download PDF

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CN110021048B
CN110021048B CN201910221079.3A CN201910221079A CN110021048B CN 110021048 B CN110021048 B CN 110021048B CN 201910221079 A CN201910221079 A CN 201910221079A CN 110021048 B CN110021048 B CN 110021048B
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CN110021048A (en
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余节约
田培娟
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Suzhou High Airlines Intellectual Property Rights Operation Co ltd
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Hangzhou Dianzi University Shangyu Science and Engineering Research Institute Co Ltd
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    • G06T7/90—Determination of colour characteristics
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Abstract

The invention relates to the field of newspaper printing production, in particular to a newspaper printing ink color evaluation method, which comprises the following steps: connecting a camera of the mobile terminal with a magnifier; calling a photographing function of the mobile terminal, and setting a plurality of view frames on a camera shooting preview screen to respectively align a sample icon and a color block to be measured on a base of the magnifying lens; subjective evaluation is carried out by utilizing the amplified sample icon and the color block to be measured which are displayed on the screen in parallel; and acquiring RGB values in each viewing frame, and calculating the color characteristic value of the color block to be measured by combining the known color characteristic values of the sample icons so as to perform objective evaluation. The invention combines visual evaluation and quantitative detection, improves the sensitivity of visual evaluation, can quickly give out color quantitative information, and is suitable for quality evaluation and control in the newspaper printing production process.

Description

Ink color evaluation method for newspaper printing
Technical Field
The invention relates to the field of newspaper printing production, in particular to an ink color evaluation method for newspaper printing.
Background
In order to obtain a high-quality newspaper printing effect, it is necessary to control the solid ink and dot gain of four colors such as cyan, magenta, yellow, and black during printing. Because the dot gain is relatively stable and the ink color is more likely to fluctuate with the change of the ink amount, the ink color needs to be evaluated more frequently during production, and the ink amount is adjusted according to the evaluation result. In addition to the cyan, magenta, yellow, and black solid ink colors, newspaper printing requires significant focus on the ink color of the header. The ink color evaluation method mainly comprises subjective evaluation and objective evaluation. The subjective evaluation method generally comprises the steps of printing a measurement and control strip containing real color blocks of cyan, magenta, yellow and black on the edge of a newspaper, and subjectively evaluating the real color blocks of cyan, magenta, yellow and black and the color depth of ink at the head part by observing with human eyes. The objective evaluation method adopts a color measuring instrument to measure real color blocks and headers of cyan, magenta, yellow and black colors on a measuring and controlling strip, the method is high in accuracy, but on one hand, the measuring instrument is expensive, and each printing control console cannot be provided with an instrument; on the other hand, in order to reduce the influence of the control bar on the overall aesthetic appearance of the newspaper, the size of the designed icon is generally slightly larger than or approximately equal to the size of the unthreaded hole of the measuring instrument, so careful operation is needed during measurement, cyan, magenta, yellow and black four-color blocks and headers are required to be measured one by one, the speed is slow, the requirement of quickly detecting the ink color in production cannot be met, the ink amount is adjusted in time according to a detection result, the ink amount is often only used for analysis and evaluation after printing, and at present, an efficient and applicable production field quality evaluation tool is lacked in the field of newspaper printing.
Disclosure of Invention
The invention aims to solve the technical problems of providing a new newspaper printing ink color evaluation method, solving the problems of inaccuracy of subjective evaluation of ink color by human eyes and low efficiency of ink color measurement by using a color measurement instrument. Based on the above, the invention provides an ink color evaluation method for newspaper printing.
In order to achieve the purpose, the invention adopts the following technical scheme:
a newspaper printing ink color evaluation method comprises the following steps:
connecting a camera of the mobile terminal with a magnifier;
calling a photographing function of the mobile terminal, and setting a plurality of view frames on a camera shooting preview screen to respectively align a sample icon and a color block to be measured on a base of the magnifying lens;
subjective evaluation is carried out by utilizing the amplified sample icon and the color block to be measured which are displayed on the screen in parallel;
and acquiring RGB values in each viewing frame, and calculating the color characteristic value of the color block to be measured by combining the known color characteristic values of the sample icons so as to perform objective evaluation.
Preferably, the magnifying lens has a magnification of 10 times, and the base of the magnifying lens is adhered with density values, XYZ values and L*a*b*The value is known, and L*a*b*A solid sample icon and a header color sample icon of four colors cyan, magenta, yellow, and black having values meeting newspaper printing standards.
As the preferred scheme, ten view frames are divided into an upper row and a lower row; wherein, the five viewing frames at the lower row are respectively aligned with the five sample icon color blocks on the base of the magnifier; the five viewing frames in the upper row are respectively marked as a first viewing frame to a fifth viewing frame from left to right and are used for partially or completely aligning the color blocks to be detected.
As a preferred scheme, when the cyan, magenta, yellow and black ink colors of the printing measurement and control strip need to be evaluated, the mobile terminal is combined with a magnifier, so that the first to fourth viewing frames on the preview screen are respectively aligned with the cyan, magenta, yellow and black blocks of the printing measurement and control strip; when the ink color of the header needs to be evaluated, the mobile phone is combined with the magnifier, so that the fifth view-finding frame on the preview screen is aligned with the header part on the newspaper.
As a preferable scheme, the subjective evaluation method comprises the following steps: when the cyan, magenta, yellow and black ink colors of the printing control strip need to be evaluated, the amplified cyan, magenta, yellow and black sample icons and the measured color block which are displayed on the screen in parallel are observed visually for subjective evaluation; when the color of the header ink needs to be evaluated, the enlarged header icon and the color block to be measured, which are displayed on the screen in parallel, are visually observed for subjective evaluation.
As a preferred scheme, the step of acquiring RGB values in each viewing frame and calculating the color characteristic value of the color block to be measured is:
(1) RGB values of pixels in the ten frames are read, average RGB values of the pixels in the frames are calculated respectively, and then XYZ values are calculated. Calculating XYZ values by using RGB values by adopting a mature technology;
(2) calculating the XYZ correction value and the density value of the color block to be measured according to the XYZ values obtained by calculation in the step (1) and the known XYZ values and density values of the sample icon, wherein the formula is as follows:
Figure BDA0002003639410000031
Figure BDA0002003639410000032
Figure BDA0002003639410000033
Figure BDA0002003639410000034
Figure BDA0002003639410000035
Figure BDA0002003639410000036
Figure BDA0002003639410000037
Figure BDA0002003639410000038
Figure BDA0002003639410000039
Figure BDA00020036394100000310
Figure BDA0002003639410000041
Figure BDA0002003639410000042
Figure BDA0002003639410000043
Figure BDA0002003639410000044
Figure BDA0002003639410000045
Figure BDA0002003639410000046
Figure BDA0002003639410000047
Figure BDA0002003639410000048
Figure BDA0002003639410000049
wherein, XC10YC10ZC10、XM10YM10ZM10、XY10YY10ZY10、XK10YK10ZK10、XT10YT10ZT10Known XYZ values, D, for cyan, magenta, yellow, black and header sample icons, respectivelyC10、DM10、DY10、DK10Known density values, X, for cyan, magenta, yellow, and black, respectivelyC11YC11ZC11、XM11YM11ZM11、XY11YY11ZY11、XK11YK11ZK11、XT11YT11ZT11XYZ values, X, for cyan, magenta, yellow, black and header sample icons respectively calculated in step (1)C21YC21ZC21、XM21YM21ZM21、XY21YY21ZY21、XK21YK21ZK21、XT21YT21ZT21XYZ values, X, of the images in the 1 st to 5 th frames calculated in the step (1), respectivelyC20YC20ZC20、XM20YM20ZM20、XY20YY20ZY20、XK20YK20ZK20、XT20YT20ZT20XYZ correction values of the first to fifth in-frame images, DC20、DM20、DY20、DK20The density values of the images in the first to fourth viewing frames are respectively;
(3) calculating L from XYZ correction values of the first to fifth in-frame images, respectively*a*b*A value; calculating L Using XYZ values*a*b*Mature techniques are adopted;
(4) l known from sample icons respectively*a*b*The value and L of the first to fifth in-frame images calculated in the step (3)*a*b*Calculating the color difference value of each column;
(5) for the left four columns, if the color difference between the sample icon and the color block to be measured is less than 20, the known density value and L are displayed in two rows below the sample icon*a*b*The value is displayed in three lines above the color block to be measured, the density value, the color difference value and the L of the color block to be measured*a*b*A value; if the color difference is equal to or greater than 20, not displaying the characteristic information; for the right column, if the color difference between the sample icon and the color patch being measured is less than 20, the known L of the sample icon is displayed below the sample icon*a*b*Value, displaying the color difference value and L of the color block in two lines above the color block*a*b*A value; if the color difference is equal to or greater than 20, the characteristic information is not displayed.
The invention has the beneficial effects that:
the newspaper printing ink color evaluation method adopts a parallel comparison mode of the sample and the measured color block, and compared with the existing method of independently and directly observing the control strip or the header, the method ensures that the ink color is more sensitive and accurate in visual subjective evaluation;
the ink color evaluation method for newspaper printing quickly acquires the color characteristic values (including density, color difference and L) of various measured colors from the preview state of a screen*a*b*Value and other ink color data information), the efficiency is greatly improved compared with that of measurement by a color measuring instrument, and the ink color is adjusted and controlled in time in the production process;
the invention combines visual evaluation and quantitative detection, improves the sensitivity of visual evaluation, can quickly give out color quantitative information, and is suitable for quality evaluation and control in the newspaper printing production process.
Drawings
FIG. 1 is a flow chart of a method for evaluating ink color of newspaper printing in accordance with an embodiment of the present invention;
FIG. 2 is a sample icon of a magnifier base and attachment according to an embodiment of the present invention;
FIG. 3 is a view showing a state of a positional relationship when a print control bar is evaluated according to an embodiment of the present invention;
fig. 4 is a positional relationship state when evaluating a header according to an embodiment of the present invention;
FIG. 5 is a screen display state of an evaluation strip according to an embodiment of the present invention;
fig. 6 is a screen display state when the header is evaluated according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, the method for evaluating ink color of newspaper printing according to the embodiment of the present invention specifically includes the following steps:
designing a newspaper printing measurement and control strip, and arranging cyan, magenta, yellow and black solid color blocks from left to right in sequence, wherein each color block is a square with the size of 2.5 mm. Selecting L from printed newspaper with measuring and controlling strip by measuring with color measuring instrument such as spectrophotometer eXact or 528 produced by Achrome*a*b*Green with a value close to the newspaper printing standard,Magenta, yellow, and black icons, recording their density values, XYZ values, and L*a*b*And cutting the color block into squares with the side length of 2.5mm along the edge of the color block. By the same method, L was selected by measurement*a*b*The header with a value close to the standard requirement is recorded with XYZ value, L*a*b*Values, also cut into squares with sides of 2.5 mm.
The cut icon is stuck on the sheet along the diameter edge of the semicircular sheet in the order of cyan, magenta, yellow, black and head as shown in fig. 2.
Connecting a camera of a mobile phone with a magnifier, compiling a mobile phone application program, calling a mobile phone camera shooting function, arranging 10 view frames on a camera shooting preview screen, dividing the view frames into an upper row and a lower row, adjusting the relative position between the camera and the magnifier in the horizontal direction, enabling the 5 view frames in the lower row to be respectively aligned with 5 icons pasted on a base, and marking the 5 view frames in the upper row as 1 st to 5 th view frames from left to right respectively, wherein the view frames are used for partially or completely aligning to a color block to be measured during measurement;
when the cyan, magenta, yellow and black ink colors of the printing measurement and control strip need to be evaluated, the mobile phone is combined with a magnifier, so that the 1 st to 4 th view frames on the preview screen respectively align with the cyan, magenta, yellow and black color blocks of the printing measurement and control strip, and as shown in fig. 3, the amplified cyan, magenta, yellow and black sample icons and the color blocks to be measured which are displayed on the screen in parallel are visually observed for subjective evaluation; when the ink color of the header needs to be evaluated, the mobile phone is combined with the magnifier, so that the 5 th view-finding frame on the preview screen is aligned with the header part on the newspaper, as shown in fig. 4, and the amplified header sample icon and the measured header which are displayed on the screen in parallel are observed visually for subjective evaluation.
RGB values in 10 frames are obtained from the preview image, and the density and L of the color block to be measured are calculated*a*b*The objective evaluation is realized by the values, the chromatic aberration and the like, and the steps are as follows:
(1) reading RGB values of pixels in 10 viewfinding frames, respectively calculating an average RGB value of the pixels in the viewfinding frames, and performing gamma correction on the RGB average value, wherein the formula is as follows:
Figure BDA0002003639410000071
where the R, G, B value is the average RGB value in the frame, gamma () is the correction function, expressed as:
Figure BDA0002003639410000072
the R ', G' and B 'values are RGB values corrected by gamma, and then matrix transformation is carried out on the corrected R', G 'and B' values to obtain XYZ values, wherein the formula is as follows:
Figure BDA0002003639410000073
(2) and (3) calculating an XYZ correction value and a density value of the color block to be measured by using the XYZ values calculated in the step (1) in the respective view frames and the known XYZ values and density values of the sample icon, wherein the formula is as follows:
Figure BDA0002003639410000081
Figure BDA0002003639410000082
Figure BDA0002003639410000083
Figure BDA0002003639410000084
Figure BDA0002003639410000091
wherein, XC10YC10ZC10、XM10YM10ZM10、XY10YY10ZY10、XK10YK10ZK10、XT10YT10ZT10Known XYZ values, D, for cyan, magenta, yellow, black and header sample icons, respectivelyC10、DM10、DY10、DK10Known density values, X, for cyan, magenta, yellow, and black, respectivelyC11YC11ZC11、XM11YM11ZM11、XY11YY11ZY11、XK11YK11ZK11、XT11YT11ZT11XYZ values, X, for cyan, magenta, yellow, black and header sample icons respectively calculated in step (1)C21YC21ZC21、XM21YM21ZM21、XY21YY21ZY21、XK21YK21ZK21、XT21YT21ZT21XYZ values, X, of the images in the 1 st to 5 th frames calculated in the step (1), respectivelyC20YC20ZC20、XM20YM20ZM20、XY20YY20ZY20、XK20YK20ZK20、XT20YT20ZT20XYZ correction values of the 1 st to 5 th in-frame images, respectively, DC20、DM20、DY20、DK20The density values of the images in the 1 st to 4 th viewing frames are respectively;
(3) calculating L from XYZ correction values of the 1 st to 5 th in-frame images, respectively*a*b*The value, the formula is:
Figure BDA0002003639410000092
Figure BDA0002003639410000093
Figure BDA0002003639410000094
wherein Xe、Ye、ZeFor reference to the tristimulus values of white, the tristimulus values of a D50 standard illuminant were taken as per the requirements of ISO 13655:2009(E) Graphic technology-Spectral measurement and colorimetric calculation for Graphic images, and are: 96.42100.0082.49, L*、a*、b*Respectively represent L*a*b*L in the value*Value a*Value b*The value, function f, is:
Figure BDA0002003639410000101
(4) known L from sample icon*a*b*The value and the L of the 1 st to 5 th in-frame images calculated in the step (3)*a*b*Value, calculate the color difference value for each column:
Figure BDA0002003639410000102
wherein
Figure BDA0002003639410000103
For L of the 1 st to 5 th in-frame images*a*b*The value of the one or more of,
Figure BDA0002003639410000104
known L for the corresponding lower row of samples*a*b*The value is obtained.
(5) And if the color difference between the color block to be detected and the color block of the sample is large, the significance of the detection data is not displayed by combining the characteristics of newspaper printing. In addition, generally speaking, one measurement is to measure either the control bar or the header, and in order to make the displayed data as concise as possible, the invention adopts the following method to display meaningful data, but shields the worthless data: for the left 4 columns, if the color difference between the sample icon and the color patch being measured is less than 20, the known density values and L are displayed in two rows below the sample icon*a*b*The value is displayed in three lines above the color block to be measured, the density value, the color difference value and the L of the color block to be measured*a*b*A value that does not display the characteristic information if the color difference is equal to or greater than 20, as shown in fig. 5; for the rightmost column, if the color difference between the sample icon and the color patch being measured is less than 20, displaying the known L of the sample icon below the sample icon*a*b*Value, displaying the color difference value and L of the color block in two lines above the color block*a*b*And a value of not displaying the characteristic information if the color difference is equal to or greater than 20. As shown in fig. 6.
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 (3)

1. A newspaper printing ink color evaluation method is characterized by comprising the following steps:
connecting a camera of the mobile terminal with a magnifier;
calling a photographing function of the mobile terminal, and setting a plurality of view frames on a camera shooting preview screen to respectively align a sample icon and a color block to be measured on a base of the magnifying lens;
subjective evaluation is carried out by utilizing the amplified sample icon and the color block to be measured which are displayed on the screen in parallel;
acquiring RGB values in each viewing frame, and calculating the color characteristic value of the color block to be measured by combining the known color characteristic values of the sample icons so as to perform objective evaluation;
the magnifying lens has a magnification of 10 times, and the base of the magnifying lens is adhered with density value, XYZ value and L*a*b*The value is known, and L*a*b*Cyan, magenta, yellow and black solid sample icons and header color sample icons with values meeting newspaper printing standard requirements;
ten view frames are divided into an upper row and a lower row; wherein, the five viewing frames at the lower row are respectively aligned with the five sample icon color blocks on the base of the magnifier; the five upper-row view frames are respectively marked as a first view frame, a second view frame, a third view frame and a fourth view frame from left to right and are used for partially or completely aligning to the color block to be detected;
the steps of obtaining RGB values in each viewing frame and calculating the color characteristic value of the color block to be measured are as follows:
(1) reading RGB values of pixels in the ten viewfinding frames, respectively calculating average RGB values of the pixels in the viewfinding frames, and then calculating XYZ values;
(2) calculating the XYZ correction value and the density value of the color block to be measured according to the XYZ values obtained by calculation in the step (1) and the known XYZ values and density values of the sample icon, wherein the formula is as follows:
Figure FDA0002894025800000011
Figure FDA0002894025800000012
Figure FDA0002894025800000013
Figure FDA0002894025800000021
Figure FDA0002894025800000022
Figure FDA0002894025800000023
Figure FDA0002894025800000024
Figure FDA0002894025800000025
Figure FDA0002894025800000026
Figure FDA0002894025800000027
Figure FDA0002894025800000028
Figure FDA0002894025800000029
Figure FDA00028940258000000210
Figure FDA00028940258000000211
Figure FDA00028940258000000212
Figure FDA00028940258000000213
Figure FDA00028940258000000214
Figure FDA00028940258000000215
Figure FDA0002894025800000031
wherein, XC10YC10ZC10、XM10YM10ZM10、XY10YY10ZY10、XK10YK10ZK10、XT10YT10ZT10Known XYZ values, D, for cyan, magenta, yellow, black and header sample icons, respectivelyC10、DM10、DY10、DK10Known density values, X, for cyan, magenta, yellow, and black, respectivelyC11YC11ZC11、XM11YM11ZM11、XY11YY11ZY11、XK11YK11ZK11、XT11YT11ZT11XYZ values, X, for cyan, magenta, yellow, black and header sample icons respectively calculated in step (1)C21YC21ZC21、XM21YM21ZM21、XY21YY21ZY21、XK21YK21ZK21、XT21YT21ZT21XYZ values, X, of the images in the first to fifth finder boxes calculated in the step (1), respectivelyC20YC20ZC20、XM20YM20ZM20、XY20YY20ZY20、XK20YK20ZK20、XT20YT20ZT20XYZ correction values of the first to fifth in-frame images, DC20、DM20、DY20、DK20The density values of the images in the first to fourth viewing frames are respectively;
(3) calculating L from XYZ correction values of the first to fifth in-frame images, respectively*a*b*A value;
(4) l known from sample icons respectively*a*b*The value and L of the first to fifth in-frame images calculated in the step (3)*a*b*Calculating the color difference value of each column;
(5) for the left four columns, if the color difference between the sample icon and the color block to be measured is less than 20, the known density value and L are displayed in two rows below the sample icon*a*b*The value is displayed in three lines above the color block to be measured, the density value, the color difference value and the L of the color block to be measured*a*b*A value; if the color difference is equal to or greater than 20, not displaying the characteristic information; for the right column, if the color difference between the sample icon and the color patch being measured is less than 20, the known L of the sample icon is displayed below the sample icon*a*b*Value, displaying the color difference value and L of the color block in two lines above the color block*a*b*A value; if the color difference is equal to or greater than 20, the characteristic information is not displayed.
2. The newspaper printing ink color evaluation method as claimed in claim 1, wherein when the cyan, magenta, yellow and black inks of the printing test strip need to be evaluated, the mobile terminal is combined with a magnifying glass, so that the first to fourth view frames on the preview screen are respectively aligned with the cyan, magenta, yellow and black blocks of the printing test strip; when the ink color of the header needs to be evaluated, the mobile phone is combined with the magnifier, so that the fifth view-finding frame on the preview screen is aligned with the header part on the newspaper.
3. The newspaper printing ink color evaluation method as set forth in claim 2, wherein the subjective evaluation method is: when the cyan, magenta, yellow and black ink colors of the printing control strip need to be evaluated, the amplified cyan, magenta, yellow and black sample icons and the measured color block which are displayed on the screen in parallel are observed visually for subjective evaluation; when the color of the header ink needs to be evaluated, the enlarged header icon and the color block to be measured, which are displayed on the screen in parallel, are visually observed for subjective evaluation.
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