CN110021048A - A kind of mass colour evaluation method of newspaper printing - Google Patents
A kind of mass colour evaluation method of newspaper printing Download PDFInfo
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- CN110021048A CN110021048A CN201910221079.3A CN201910221079A CN110021048A CN 110021048 A CN110021048 A CN 110021048A CN 201910221079 A CN201910221079 A CN 201910221079A CN 110021048 A CN110021048 A CN 110021048A
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- 238000007639 printing Methods 0.000 title claims abstract description 40
- 238000011156 evaluation Methods 0.000 title claims abstract description 27
- 239000011521 glass Substances 0.000 claims abstract description 23
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003086 colorant Substances 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 7
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- 239000000976 ink Substances 0.000 claims description 6
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- 230000000007 visual effect Effects 0.000 abstract description 5
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- 238000013441 quality evaluation Methods 0.000 abstract description 3
- 238000003908 quality control method Methods 0.000 abstract description 2
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- 230000035945 sensitivity Effects 0.000 abstract description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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Abstract
The present invention relates to newspaper printing production fields, and in particular to a kind of mass colour evaluation method of newspaper printing, comprising the following steps: by the camera connecting magnifying glass of mobile terminal；Multiple view-finders are arranged in image pickup preview screen, with the sample icon and tested color lump being respectively aligned on magnifying glass pedestal in the camera function for calling mobile terminal；Subjective assessment is carried out using the amplified sample icon arranged side by side presented on the screen and tested color lump；The rgb value in each view-finder is obtained, the color feature value in conjunction with known to sample icon calculates the color feature value of tested color lump, to be objectively evaluated.The present invention combines visual valuation and quantitative detection, has not only improved the sensitivity of visual valuation, but also can quickly provide color quantification information, has been applicable in the quality evaluation and control of newspaper printing production process.
Description
Technical field
The present invention relates to newspaper printing production fields, and in particular to a kind of mass colour evaluation method of newspaper printing.
Background technique
In order to obtain the newspaper printing effect of high quality, when printing, needs to control four colors such as green, pinkish red, yellow, black on the spot
Mass colour and dot gain rate.Since dot gain rate is relatively stable, mass colour is more easier to fluctuate with inking amount size variation, because
This, more needs continually to evaluate mass colour in production, adjusts ink amount size according to evaluation result.Except green, pinkish red, yellow, black four color
On the spot outside mass colour, newspaper printing also needs to pay close attention to header mass colour.The method of mass colour evaluation mainly has subjective assessment and objective
Evaluation.It includes the control strip of green, pinkish red, yellow, black four color color lump on the spot that subjective evaluation method, which is usually in the printing of newspaper edge,
With eye-observation, green, pinkish red, yellow, black four color of subjective evaluation on the spot with the mass colour depth of header, since people is to the memory energy of color
Power is very poor, and this evaluation method error is very big, and it is inaccurate to easily lead to mass colour control.Method for objectively evaluating is using color measurement instrument
Device, to green on control strip, pinkish red, yellow, black four color, color lump and header are measured on the spot, and this method is accurately high, but on the one hand,
Measuring instrument price is more expensive, it is impossible to which each printing console is all equipped with instrument；On the other hand, whole to newspaper to reduce control strip
The influence of body beauty, the icon size of design are generally slightly larger than or are approximately equal to measuring instrument unthreaded hole size, therefore need when measurement thin
Heart operation, and need to measure green, pinkish red, yellow, black four colors color lump and header one by one, speed is slower, is not able to satisfy in production
Quickly detection mass colour, and the needs of the black amount of adjustment in time according to testing result, analysis and evaluation after being often served only for printing, mesh
Before, newspaper printing field lacks production scene quality evaluation tool efficiently, applicable.
Summary of the invention
The technical problem to be solved by the present invention is to propose the mass colour evaluation method of new newspaper printing, solve to rely on human eye
The inaccurate problem of subjective assessment is carried out to mass colour, and the low efficiency problem of mass colour measurement is carried out using color measurement instrument.Base
In this, the present invention provides a kind of mass colour evaluation method of newspaper printing.
In order to achieve the above object of the invention, the invention adopts the following technical scheme:
A kind of mass colour evaluation method of newspaper printing, comprising the following steps:
By the camera connecting magnifying glass of mobile terminal；
Multiple view-finders are arranged in image pickup preview screen, to be respectively aligned to magnifying glass in the camera function for calling mobile terminal
Sample icon and tested color lump on pedestal；
Subjective assessment is carried out using the amplified sample icon arranged side by side presented on the screen and tested color lump；
The rgb value in each view-finder is obtained, the color feature value in conjunction with known to sample icon calculates the color of tested color lump
Characteristic value, to be objectively evaluated.
Preferably, the enlargement ratio of the magnifying glass is 10 times, paste on magnifying glass pedestal density value, XYZ value,
L*a*b*Value is it is known that and L*a*b*Value meets the blueness of newspaper printing standard requirements, magenta, Huang, black four color sample icon and report on the spot
Head colo(u)r atlas icon.
Preferably, the view-finder has ten, is divided into two rows up and down；Wherein, five view-finders difference of lower row
Five sample icon color lumps being aligned on magnifying glass pedestal；Five view-finders of upper row are from left to right denoted as first to respectively
Five view-finders, for being partly or entirely directed at tested color lump.
Preferably, mobile whole when the blueness of needs assessment printing control strip, magenta, Huang, black four color inks color
End is combined with magnifying glass, make first to fourth view-finder on preview screen be respectively aligned to the blueness of printing control strip, magenta, Huang,
Black four colors color lump；When needs assessment header mass colour, cell phone is combined with magnifying glass, makes on preview screen the 5th to find a view
Frame is directed at the header position on newspaper.
Preferably, the subjective evaluation method are as follows: when the blueness of needs assessment printing control strip, magenta, Huang, black
When four color ink colors, amplified green, pinkish red, yellow, the black sample icon and tested color lump visually presented side by side on the screen is carried out
Subjective assessment；When needs assessment header mass colour, amplified header icon on the screen is visually presented side by side and by colour examining
Block carries out subjective assessment.
Preferably, the step of rgb value in each view-finder of acquisition, the color feature value of the tested color lump of calculating
Are as follows:
(1) rgb value for reading each pixel in ten view-finders, calculates separately the average RGB value of pixel in each view-finder,
XYZ value is calculated again.XYZ value is calculated using mature technology using rgb value；
(2) XYZ value, density value known to the XYZ value and sample icon being calculated according to step (1), calculate by colour examining
The XYZ correction value and density value of block, formula are as follows:
Wherein, XC10YC10ZC10、XM10YM10ZM10、XY10YY10ZY10、XK10YK10ZK10、XT10YT10ZT10Respectively green, pinkish red,
XYZ value known to yellow, black and header sample graph target, DC10、DM10、DY10、DK10Respectively green, pinkish red, yellow, black known density
Value, XC11YC11ZC11、XM11YM11ZM11、XY11YY11ZY11、XK11YK11ZK11、XT11YT11ZT11Respectively step (1) is calculated
Green, pinkish red, yellow, black and header sample graph target XYZ value, XC21YC21ZC21、XM21YM21ZM21、XY21YY21ZY21、XK21YK21ZK21、
XT21YT21ZT21The XYZ value of image, X respectively in the 1st to the 5th view-finder being calculated of step (1)C20YC20ZC20、
XM20YM20ZM20、XY20YY20ZY20、XK20YK20ZK20、XT20YT20ZT20The XYZ of image is repaired in respectively first to the 5th view-finder
Positive value, DC20、DM20、DY20、DK20The density value of image in respectively first to the 4th view-finder；
(3) L is calculated according to the XYZ correction value of image in first to the 5th view-finder respectively*a*b*Value；Utilize XYZ value meter
Calculate L*a*b*Value is using mature technology；
(4) L according to known to sample icon respectively*a*b*First to the 5th view-finder that value and step (3) are calculated
The L of interior image*a*b*Value, calculates the value of chromatism of each column；
(5) it arranges for left side four, if color difference is less than 20 between sample icon and tested color lump, divides below sample icon
Two rows show known density value and L*a*b*Value, above tested color lump point three rows show the density value for being tested color lump, value of chromatism and
L*a*b*Value；If color difference is equal to or more than 20, characteristic information is not shown；It is arranged for right side one, if sample icon and tested
Color difference shows L known to sample icon less than 20 below sample icon between color lump*a*b*Value, point two rows above tested color lump
Show the value of chromatism and L of tested color lump*a*b*Value；If color difference is equal to or more than 20, characteristic information is not shown.
The invention has the benefit that
The mass colour evaluation method of newspaper printing of the invention is using sample and tested color lump manner of comparison arranged side by side, compared to existing
Some independently, directly observe control strip or header, keep visual subjective assessment mass colour more sensitive accurate；
Color of the mass colour evaluation method of newspaper printing of the present invention from a variety of tested colors of screen preview state quick obtaining
Characteristic value (including density, color difference, L*a*b*The mass colours data informations such as value), it is compared to and is measured with color measurement instrument, efficiency is big
Width improves, and is conducive to the mass colour of adjustment control in time in production process；
The present invention combines visual valuation and quantitative detection, has not only improved the sensitivity of visual valuation, but also can be fast
Speed provides color quantification information, is applicable in the quality evaluation and control of newspaper printing production process.
Detailed description of the invention
Fig. 1 is the flow chart of the mass colour evaluation method of the newspaper printing of the embodiment of the present invention；
Fig. 2 is the magnifying glass pedestal of the embodiment of the present invention and the sample icon of stickup；
Fig. 3 is positional relationship state when evaluating print control strip of the embodiment of the present invention；
Fig. 4 is positional relationship state when evaluating header of the embodiment of the present invention；
Screen display state when Fig. 5 is the evaluation control strip of the embodiment of the present invention；
Screen display state when Fig. 6 is the evaluation header of the embodiment of the present invention.
Specific embodiment
The present invention is further described in detail with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the mass colour evaluation method of the newspaper printing of the embodiment of the present invention, specifically includes the following steps:
Newspaper printing control strip is designed, from left to right green, pinkish red, yellow, the black color lump on the spot of arrangement, each color lump are in order
The square of 2.5mm.From the newspaper with control strip printed, using color measurement instrument, as X. Rite Inc. is raw
The equal spectrophotometers of the eXact of production or 528, measure, pick out L*a*b*Be worth close to newspaper printing standard requirements blueness,
Pinkish red, yellow, black icon, records its density value, XYZ value, L*a*b*Value, then along color lump edge cut into side length be 2.5mm just
It is rectangular.L is picked out by measurement with same method*a*b*It is worth the header close to standard requirements, records its XYZ value, L*a*
b*Value also cuts into the square that side length is 2.5mm.
The magnifying glass for being 10 times using existing, enlargement ratio, magnifying glass pedestal and observing object contact position are equipped with half
The semicircle thin slice of field range, by the above-mentioned icon cut, along the diameter edge of semicircle thin slice, according to it is green, pinkish red,
Yellow, black, header sequence is pasted on thin slice, as shown in Figure 2.
The camera connecting magnifying glass of mobile phone, application program of mobile phone, calling mobile phone camera function, in image pickup preview are write
10 view-finders are arranged in screen, are divided into two rows up and down, adjust the horizontal direction relative position between camera and magnifying glass, can make
5 view-finders of lower row are respectively aligned to paste on pedestal 5 icons, and 5 view-finders of upper row are from left to right denoted as respectively
1st to the 5th view-finder is partly or entirely directed at tested color lump when for measuring；
When the blueness of needs assessment printing control strip, magenta, Huang, black four color inks color, cell phone is combined with magnifying glass, is made
The the 1st to the 4th view-finder is respectively aligned to the blueness of printing control strip, magenta, Huang, black four colors color lump on preview screen, such as Fig. 3 institute
Show, visually present side by side on the screen, amplified green, pinkish red, yellow, black sample icon and tested color lump carry out subjectivity and comment
Valence；When needs assessment header mass colour, cell phone is combined with magnifying glass, and the 5th on preview screen view-finder is made to be directed at report
Header position on paper, as shown in figure 4, visually present side by side on the screen, amplified header sample icon and observed and predicted
Head carries out subjective assessment.
The rgb value in 10 view-finders is obtained from preview image, calculates density, the L of tested color lump*a*b*Value and color difference etc.,
Realization objectively evaluates, step are as follows:
(1) rgb value for reading each pixel in 10 view-finders, calculates separately the average RGB value of pixel in each view-finder,
Gamma amendment, formula are carried out to RGB average value are as follows:
Wherein R, G, B value are the average RGB value in view-finder, and gamma () is correction function, are indicated are as follows:
R ', G ', B ' are worth to carry out matrix change by the revised rgb value of gamma, then to revised R ', G ', B ' value
It changes, obtains XYZ value, formula are as follows:
(2) using XYZ value known to the XYZ value and sample icon being calculated according to step (1) in each view-finder,
Density value calculates the XYZ correction value and density value of tested color lump, formula are as follows:
Wherein, XC10YC10ZC10、XM10YM10ZM10、XY10YY10ZY10、XK10YK10ZK10、XT10YT10ZT10Respectively green, pinkish red,
XYZ value known to yellow, black and header sample graph target, DC10、DM10、DY10、DK10Respectively green, pinkish red, yellow, black known density
Value, XC11YC11ZC11、XM11YM11ZM11、XY11YY11ZY11、XK11YK11ZK11、XT11YT11ZT11Respectively step (1) is calculated
Green, pinkish red, yellow, black and header sample graph target XYZ value, XC21YC21ZC21、XM21YM21ZM21、XY21YY21ZY21、XK21YK21ZK21、
XT21YT21ZT21The XYZ value of image, X respectively in the 1st to the 5th view-finder being calculated of step (1)C20YC20ZC20、
XM20YM20ZM20、XY20YY20ZY20、XK20YK20ZK20、XT20YT20ZT20The XYZ amendment of image in respectively the 1st to the 5th view-finder
Value, DC20、DM20、DY20、DK20The density value of image in respectively the 1st to the 4th view-finder；
(3) L is calculated according to the XYZ correction value of image in the 1st to the 5th view-finder respectively*a*b*Value, formula are as follows:
Wherein Xe、Ye、ZeFor the tristimulus values of reference white, according to ISO 13655:2009 (E) Graphic
technology—Spectral measurement and colorimetric computation for graphic
The requirement of arts image takes the tristimulus values of D50 standard illuminants, is respectively as follows: 96.42 100.00 82.49, L*、a*、b*
Respectively indicate L*a*b*L in value*Value, a*Value, b*Value, function f are as follows:
(4) according to L known to sample graph target*a*b*Image in the 1st to the 5th view-finder that value and step (3) are calculated
L*a*b*Value, calculates the value of chromatism of each column:
WhereinFor the L of image in the 1st to the 5th view-finder*a*b*Value,
For the known L of corresponding lower stock layout sheet*a*b*Value.
(5) the characteristics of combining newspaper printing, is tested between color lump and sample color lump if color difference is very big, does not show detection
The meaning of data.In addition, in general, one-shot measurement or control strip or measurement header are surveyed, in order to keep the data of display most
Amount is succinct, and the present invention shows meaningful data using following method, and shields unworthy data: it is arranged for left side 4, if
Color difference is less than 20 between sample icon and tested color lump, and point two rows show known density value and L below sample icon*a*b*Value,
Point three rows show density value, value of chromatism and the L of tested color lump above tested color lump*a*b*Value, if color difference is equal to or more than
20, then do not show characteristic information, as shown in Figure 5；It is arranged for the rightmost side one, if color difference is small between sample icon and tested color lump
In 20, L known to sample icon is shown below sample icon*a*b*Value, point two rows show tested color lump above tested color lump
Value of chromatism and L*a*b*Value does not show characteristic information if color difference is equal to or more than 20.As shown in Figure 6.
The preferred embodiment of the present invention and principle are described in detail above, to those skilled in the art
Speech, the thought provided according to the present invention will change in specific embodiment, and these changes also should be regarded as the present invention
Protection scope.
Claims (6)
1. a kind of mass colour evaluation method of newspaper printing, which comprises the following steps:
By the camera connecting magnifying glass of mobile terminal；
Multiple view-finders are arranged in image pickup preview screen, to be respectively aligned to magnifying glass pedestal in the camera function for calling mobile terminal
On sample icon and tested color lump；
Subjective assessment is carried out using the amplified sample icon arranged side by side presented on the screen and tested color lump；
The rgb value in each view-finder is obtained, the color feature value in conjunction with known to sample icon calculates the color characteristic of tested color lump
Value, to be objectively evaluated.
2. a kind of mass colour evaluation method of newspaper printing according to claim 1, which is characterized in that the magnifying glass is put
Big multiplying power is 10 times, pastes density value, XYZ value, L on magnifying glass pedestal*a*b*Value is it is known that and L*a*b*Value meets newspaper printing mark
The blueness of alignment request, magenta, Huang, black four color sample icon and header colo(u)r atlas icon on the spot.
3. a kind of mass colour evaluation method of newspaper printing according to claim 2, which is characterized in that the view-finder has ten
It is a, it is divided into two rows up and down；Wherein, five view-finders of lower row are respectively aligned to five sample icon color lumps on magnifying glass pedestal；
Five view-finders of upper row are from left to right denoted as first to the 5th view-finder respectively, for being partly or entirely aligned by colour examining
Block.
4. a kind of mass colour evaluation method of newspaper printing according to claim 3, which is characterized in that when needs assessment is printed
When the blueness of control strip, magenta, Huang, black four color inks color, mobile mobile terminal is combined with magnifying glass, makes on preview screen first to the
Four view-finders are respectively aligned to the blueness of printing control strip, magenta, Huang, black four colors color lump；It is mobile when needs assessment header mass colour
Mobile phone is combined with magnifying glass, makes the header position on the 5th on preview screen view-finder alignment newspaper.
5. a kind of mass colour evaluation method of newspaper printing according to claim 4, which is characterized in that the subjective assessment
Method are as follows: when the blueness of needs assessment printing control strip, magenta, Huang, black four color inks color, putting on the screen is visually presented side by side
Blueness, magenta, Huang, black sample icon and tested color lump after big carry out subjective assessment；When needs assessment header mass colour, visually simultaneously
Amplified header icon and the progress subjective assessment of tested color lump on the screen is presented in column.
6. a kind of mass colour evaluation method of newspaper printing according to claim 3, which is characterized in that the acquisition is respectively found a view
The step of rgb value in frame, the color feature value of the tested color lump of calculating are as follows:
(1) rgb value for reading each pixel in ten view-finders, calculates separately the average RGB value of pixel in each view-finder, then count
Calculate XYZ value；
(2) XYZ value and density value known to the XYZ value and sample icon being calculated according to step (1) calculate tested color lump
XYZ correction value and density value, formula are as follows:
Wherein, XC10YC10ZC10、XM10YM10ZM10、XY10YY10ZY10、XK10YK10ZK10、XT10YT10ZT10It is respectively green, pinkish red, yellow, black
With header sample graph target known to XYZ value, DC10、DM10、DY10、DK10Respectively green, pinkish red, yellow, black known density value,
XC11YC11ZC11、XM11YM11ZM11、XY11YY11ZY11、XK11YK11ZK11、XT11YT11ZT11Respectively step (1) be calculated blueness, product
Red, yellow, black and header sample graph target XYZ value, XC21YC21ZC21、XM21YM21ZM21、XY21YY21ZY21、XK21YK21ZK21、
XT21YT21ZT21The XYZ value of image, X respectively in first to the 5th view-finder being calculated of step (1)C20YC20ZC20、
XM20YM20ZM20、XY20YY20ZY20、XK20YK20ZK20、XT20YT20ZT20The XYZ of image is repaired in respectively first to the 5th view-finder
Positive value, DC20、DM20、DY20、DK20The density value of image in respectively first to the 4th view-finder；
(3) L is calculated according to the XYZ correction value of image in first to the 5th view-finder respectively*a*b*Value；
(4) L according to known to sample icon respectively*a*b*Scheme in first to the 5th view-finder that value and step (3) are calculated
The L of picture*a*b*Value, calculates the value of chromatism of each column；
(5) it is arranged for left side four, if color difference is less than 20 between sample icon and tested color lump, point two rows below sample icon
Show known density value and L*a*b*Value, point three rows show density value, value of chromatism and the L of tested color lump above tested color lump*a*
b*Value；If color difference is equal to or more than 20, characteristic information is not shown；It is arranged for right side one, if sample icon and by colour examining
Color difference shows L known to sample icon less than 20 below sample icon between block*a*b*Value, point two rows are aobvious above tested color lump
Show the value of chromatism and L of tested color lump*a*b*Value；If color difference is equal to or more than 20, characteristic information is not shown.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114393922A (en) * | 2021-12-27 | 2022-04-26 | 杭州电子科技大学温州研究院有限公司 | Newspaper printing color management method |
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