CN106515241B - A kind of fluorescence coloured picture screening method and device - Google Patents
A kind of fluorescence coloured picture screening method and device Download PDFInfo
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- CN106515241B CN106515241B CN201611037141.6A CN201611037141A CN106515241B CN 106515241 B CN106515241 B CN 106515241B CN 201611037141 A CN201611037141 A CN 201611037141A CN 106515241 B CN106515241 B CN 106515241B
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- grid cell
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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
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Abstract
The invention discloses a kind of fluorescence coloured picture screening method and devices, can reduce the probability of ink trapping by the arrangement mode of change site, it is pale effectively to solve the problems, such as that colorless fluorescent ink generates under the excited state of ultraviolet light.A kind of fluorescence coloured picture screening method provided by the invention, comprising: at least three sites are arranged in a grid cell；Grid cell is arranged into networking battle array, the angle of grid cell centers point line and horizontal datum with common edge includes X °, X+60 ° and/or X+120 °, and wherein X is between 0 ° -360 °；Screening processing is carried out in a manner of netting gust to burst of ultraviolel colorless fluorescent RGB type ink.
Description
Technical field
The present invention relates to Technology for Image Printing field more particularly to a kind of fluorescence coloured picture screening methods and device.
Background technique
Modern offset printing is divided into four colors using offset printing, i.e. four-colour chromatography, that is, by color image: green (C), product
(M), yellow (Y), black (K) four color.For a kind of ink, its color and concentration be it is fixed, i.e., output is the result is that 2 values, 0
With 1, the presence or absence of ink is respectively represented, there is no intermediate gray levels, this just determines a width by figure to be printed
As that should be made of binary pictorial element.It completes to be called linked network from grayscale image to the operating process of 2 value images.Linked network
Also it is screening, refers to the process of the picture breakdown continuous tone at site.Image after screening, with the size or density of site
Reflect the actual level of image.The process for carrying out screening to image is known as digital halftone process in iconology.If site
Between be equidistant and size is variation, referred to as amplitude modulation net；Site size is identical and spacing is variation, referred to as modulating net.
It is fine to observe the point grain it can be seen that small when watching the image printed out using amplifying device, it can be found that
The arrangement regulation of the point grain of solid color.The changing rule of point grain has following two: point grain center is regularly arranged, puts grain
Size increases with the increase of local gray level grade, and this image is generated by amplitude modulation net linked network, wherein point grain of various shapes
Industry is known as site.Other image, point grain therein is more tiny, and their size is identical, only gray scale layer
Secondary high place point grain is intensive, and the low place point grain of level is lax, and this image is exactly what modulating net linked network generated, point therein
Grain is also commonly referred to as site, but significance of which is different with the site in amplitude modulation net.
Existing meshing method can provide the color double exposure of normal ink, but if being applied to burst of ultraviolel colorless fluorescent
RGB type ink then can excessively cause color of image dimness pale because of double exposure part.
Summary of the invention
The present invention provides a kind of fluorescence coloured picture screening methods, can reduce ink by the arrangement mode of change site
It is pale effectively to solve the problems, such as that colorless fluorescent ink generates under the excited state of ultraviolet light for the probability of double exposure.
A kind of fluorescence coloured picture screening method provided by the invention, comprising:
At least three sites are arranged in a grid cell；
Grid cell is arranged into networking battle array, the angle of grid cell centers point line and horizontal datum with common edge
Including X °, X+60 ° and/or X+120 °, wherein X is between 0 ° -360 °；
Screening processing is carried out in a manner of netting gust to burst of ultraviolel colorless fluorescent RGB type ink.
Optionally,
Grid cell is equilateral triangle.
Optionally,
Grid cell is regular hexagon.
Optionally,
Site includes: triangle, diamond shape, circle, rectangular and/or oval.
Optionally,
The fluorescence coloured picture screening method further includes
The size of site is adjusted according to the predetermined printed matter color depth.
The present invention also provides a kind of fluorescence coloured picture screening devices, comprising:
First order unit, at least three sites to be arranged in a grid cell；
Second order unit, for grid cell to be arranged networking battle array, the grid cell centers point line with common edge
Angle with horizontal datum includes X °, X+60 ° and/or X+120 °, and wherein X is between 0 ° -360 °；
Screening processing unit, for carrying out screening processing in a manner of netting gust to burst of ultraviolel colorless fluorescent RGB type ink.
Optionally,
Grid cell is equilateral triangle.
Optionally,
Grid cell is regular hexagon.
Optionally,
Site includes: triangle, diamond shape, circle, rectangular and/or oval.
Optionally,
The device further include:
Unit is adjusted, the size for site is adjusted according to the predetermined printed matter color depth.
As can be seen from the above technical solutions, the embodiment of the present invention specifically has the advantage that
Technical solution of the present invention includes that at least three sites are arranged in a grid cell；Grid cell is arranged into networking
The angle of battle array, grid cell centers point line and horizontal datum with common edge includes X °, X+60 ° and/or X+120 °,
Middle X is between 0 ° -360 °；Screening processing is carried out in a manner of netting gust to burst of ultraviolel colorless fluorescent RGB type ink.Due to colourless glimmering
Light RGB type ink is color just to be generated in burst of ultraviolel, therefore visible optical superposition generates white light when multicolour superposition,
To make ink overlapping portion generate pale technical problem.The phenomenon is inappropriate with cable angle, will lead to generate " tortoise
The interference pattern of line " is all since ink is superimposed the technical issues of generating.When several halftoning (or color) double exposures in living-article all
It will appear moire, or even in black and white printing, if its original copy band laciness or herringbone pattern, Screening Image or textile,
Also moire pattern can be shown.Because moire be due to screening pattern double exposure direction it is inappropriate caused by, use screen figure
Angle between case can also reduce moire as the method for determining halftoning direction.When angle between screen is 45 °, moire figure
Case is minimum, and moire pattern that screen angle is formed when being 30 ° and the difference that 45 ° of whens are formed are little.Therefore, 30 ° of angles allow three
The moire planting color double exposure and generating is minimum.Since the probability of burst of ultraviolel colorless fluorescent RGB type ink double exposure each other reduces,
To which the technical solution can reduce the probability of ink trapping by the arrangement mode of change site, colorless fluorescent is effectively solved
Ink leads to the problem of pale under the excited state of ultraviolet light.
Detailed description of the invention
Fig. 1 is the net battle array partial enlargement diagram that fluorescence coloured picture screening method uses in the embodiment of the present invention.
Specific embodiment
The present invention provides a kind of fluorescence coloured picture screening methods, can reduce ink by the arrangement mode of change site
It is pale effectively to solve the problems, such as that colorless fluorescent ink generates under the excited state of ultraviolet light for the probability of double exposure.
The technical term covered first to the technical solution of following statement is illustrated: the print reproduction of graph text information relies on
Generation and transmitting in site, the original graph text information for needing to replicate, which must be converted into site, could gradually be transmitted to stock
On, eventually become printed matter.
Two-value plane is divided into multiple grids by printing plate two-value and the contradiction of picture and text ambiguity, is placed in each grid
One or more sites by the area of change site or the quantity of site or are both the area and quantity for changing site, make
Ambiguity site area occupied in grid and had is transmitted the ink of different number using grid as unit, reaches macro
Change the purpose of contrast layer in sight.
Meshing method includes: am screening and fm screening and hybrid screening.
Am screening: dot area percentage changes with the depth of image, and the spatial frequency that site occurs is fixed, and ranks are pressed in site
Arrangement.Site is bigger, and color is deeper, and site is smaller, and color is more shallow.
Fm screening: dot area is fixed, site occur spatial frequency with the image depth change, site on microcosmic at
Random distribution.Dot number is more, and tone is lower；Quantity is fewer, and tone is higher.
Hybrid screening: there is spatial frequency and all change with the depth of image in dot area and site, and hybrid screening is sufficiently sharp
The advantages of with Frequency And Amplitude Modulation screening, avoids the deficiency of the two, has reached and maximized favourable factors and minimized unfavourable ones, and optimizes the mesh of picture and text print effect
Common feature: grid, grid area are the basic square measures for measuring dot area percentage, and the shape of grid is generally pros
Shape is but it is also possible to be rectangle or other shapes.After the site line number (screen frequency) in setting unit size, each grid
Area it is usually identical.Grid is to the size of its inside site, shape, optical density (OD), spatial frequency, arrangement mode
Deng there is no limit.Grid is invisible on printed matter.
Cable angle: there are the public grid element center point for facing side, the angle between line direction and reference line direction.
Influence of the cable angle to print reproduction: in print reproduction, common cable angle has 0 °, 15 °, 45 °, 75 °.
The site of different angle arrangement is different to the visual experience of people.Polychrome site double exposure and Moire fringe interference phenomenon, polychrome printing,
Using the method reproducing colors of the ink printing of a variety of different diffraction, the ink site of different colours double exposure at different angles,
The interference phenomenon of striated can be generated.
A kind of fluorescence coloured picture screening method provided by the invention, comprising:
At least three sites are arranged in a grid cell；
Grid cell is arranged into networking battle array, the angle of grid cell centers point line and horizontal datum with common edge
Including X °, X+60 ° and/or X+120 °, wherein X is between 0 ° -360 °；
In the present embodiment, by being set to parameter in screen, site is arranged in the form of grid cell, further
Grid cell will be arranged to networking battle array, specific queueing discipline is grid cell centers point line and horizontal reference with common edge
The angle of line includes 30 °, 90 ° and 150 °.
It should be noted that meeting the grid cell shape of above-mentioned queueing discipline may include but is not limited to equilateral triangle
And regular hexagon.Site includes, but are not limited to triangle, diamond shape, circle, rectangular and oval.
Wherein, cable angle is as described in Figure 1.
Screening processing is carried out in a manner of netting gust to burst of ultraviolel colorless fluorescent RGB type ink.
It should be noted that burst of ultraviolel colorless fluorescent RGB type ink can issue RGB under the irradiation of ultraviolet light can
It is light-exposed.
In the present embodiment, since colorless fluorescent RGB type ink is just to generate color in burst of ultraviolel, when a variety of
Visible optical superposition generates white light when color overlaid, so that ink overlapping portion be made to generate pale technical problem.The same net of the phenomenon
Line angle degree is inappropriate, and the interference pattern that will lead to generate " moire " is all since ink is superimposed the technical issues of generating.It is several
Can all occur moire when halftoning (or color) double exposure in living-article, or even in black and white printing, if its original copy band laciness or
Herringbone pattern, Screening Image or textile can also show moire pattern.Because moire is due to screening pattern double exposure direction
Caused by inappropriate, so using the angle between screen pattern as the method for determining halftoning direction, moire can also be reduced.Net
When angle between screen is 45 °, moire pattern is minimum, moire pattern that screen angle is formed when being 30 ° and the difference that 45 ° of whens are formed
Not not less.Therefore, the moire that 30 ° of angles allow three kinds of color double exposures and generate is minimum.Due to burst of ultraviolel colorless fluorescent RGB type
The probability of ink double exposure each other reduces, so that the technical solution it is folded can to reduce ink by changing the arrangement mode of site
It is pale effectively to solve the problems, such as that colorless fluorescent ink generates under the excited state of ultraviolet light for the probability of print.
It should be noted that the fluorescence coloured picture screening method further includes but does not limit using am screening, wherein site
Size is adjusted according to the predetermined printed matter color depth.Specific Rule adjusting is that color is deeper, and dot area is bigger, face
Color is more shallow, and dot area is smaller.
The present invention also provides a kind of fluorescence coloured picture screening devices, comprising:
First order unit, at least three sites to be arranged in a grid cell；
Second order unit, for grid cell to be arranged networking battle array, the grid cell centers point line with common edge
Angle with horizontal datum includes X °, X+60 ° and/or X+120 °, and wherein X is between 0 ° -360 °；
Screening processing unit, for carrying out screening processing in a manner of netting gust to burst of ultraviolel colorless fluorescent RGB type ink.
The correspondence between said units is illustrated with the example of a concrete application below:
Firstly, at least three sites are arranged in a grid cell by first order unit；
Then, grid cell is arranged networking battle array by second order unit, the grid cell centers point line with common edge
Angle with horizontal datum includes X °, X+60 ° and/or X+120 °, and wherein X is between 0 ° -360 °；
In the present embodiment, by being set to parameter in screen, site is arranged in the form of grid cell, further
Grid cell will be arranged to networking battle array, specific queueing discipline is grid cell centers point line and horizontal reference with common edge
The angle of line includes 30 °, 90 ° and 150 °.
It should be noted that meeting the grid cell shape of above-mentioned queueing discipline may include but is not limited to equilateral triangle
And regular hexagon.Site includes, but are not limited to triangle, diamond shape, circle, rectangular and oval.
Finally, screening processing unit carries out screening processing in a manner of netting gust to burst of ultraviolel colorless fluorescent RGB type ink.
It should be noted that burst of ultraviolel colorless fluorescent RGB type ink can issue RGB under the irradiation of ultraviolet light can
It is light-exposed.
In the present embodiment, since colorless fluorescent RGB type ink is just to generate color in burst of ultraviolel, when a variety of
Visible optical superposition generates white light when color overlaid, so that ink overlapping portion be made to generate pale technical problem.The same net of the phenomenon
Line angle degree is inappropriate, and the interference pattern that will lead to generate " moire " is all since ink is superimposed the technical issues of generating.It is several
Can all occur moire when halftoning (or color) double exposure in living-article, or even in black and white printing, if its original copy band laciness or
Herringbone pattern, Screening Image or textile can also show moire pattern.Because moire is due to screening pattern double exposure direction
Caused by inappropriate, so using the angle between screen pattern as the method for determining halftoning direction, moire can also be reduced.Net
When angle between screen is 45 °, moire pattern is minimum, moire pattern that screen angle is formed when being 30 ° and the difference that 45 ° of whens are formed
Not not less.Therefore, the moire that 30 ° of angles allow three kinds of color double exposures and generate is minimum.Due to burst of ultraviolel colorless fluorescent RGB type
The probability of ink double exposure each other reduces, so that the technical solution it is folded can to reduce ink by changing the arrangement mode of site
It is pale effectively to solve the problems, such as that colorless fluorescent ink generates under the excited state of ultraviolet light for the probability of print.
The device further include:
Unit is adjusted, the size for site is adjusted according to the predetermined printed matter color depth.
The functional units in various embodiments of the present invention may be integrated into one processing unit, is also possible to each
Unit physically exists alone, and can also be integrated in one unit with two or more units.Above-mentioned integrated unit both may be used
To use formal implementation of hardware, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (4)
1. a kind of fluorescence coloured picture screening method characterized by comprising
At least three sites are arranged in a grid cell, wherein the grid cell is equilateral triangle or regular hexagon；
The grid cell is arranged into networking battle array, the angle of grid cell centers point line and horizontal datum with common edge
Including 30 °, 90 ° and 150 °；
Screening processing is carried out in a manner of the net battle array to burst of ultraviolel colorless fluorescent RGB type ink；
The dot shape is: triangle, diamond shape, circle, rectangular and/or oval.
2. fluorescence coloured picture screening method according to claim 1, which is characterized in that
The method also includes the sizes of the site to be adjusted according to the predetermined printed matter color depth.
3. a kind of fluorescence coloured picture screening device characterized by comprising
First order unit, at least three sites to be arranged in a grid cell, wherein the grid cell is positive three
Angular or regular hexagon；
Second order unit, for the grid cell to be arranged networking battle array, the grid cell centers point line with common edge
Angle with horizontal datum includes 30 °, 90 ° and 150 °；
Screening processing unit, for carrying out screening processing in a manner of the net battle array to burst of ultraviolel colorless fluorescent RGB type ink；
The dot shape is: triangle, diamond shape, circle, rectangular and/or oval.
4. fluorescence coloured picture screening device according to claim 3, which is characterized in that
Described device further include:
Unit is adjusted, the size for the site is adjusted according to the predetermined printed matter color depth.
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| CN201611037141.6A CN106515241B (en) | 2016-11-23 | 2016-11-23 | A kind of fluorescence coloured picture screening method and device |
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| CN201611037141.6A CN106515241B (en) | 2016-11-23 | 2016-11-23 | A kind of fluorescence coloured picture screening method and device |
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| CN108391030B (en) * | 2018-02-12 | 2020-11-03 | 湖南工业大学 | Colorless fluorescent halftone color image screening method and device based on dot juxtaposition |
| CN109624537A (en) * | 2018-11-01 | 2019-04-16 | 中国安全防伪证件研制中心 | A kind of printing process and system of color fluorescence effect security pattern |
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| DE102009018284A1 (en) * | 2008-05-19 | 2009-11-26 | Heidelberger Druckmaschinen Ag | Method for screening color separations of a lenticular image and method for producing a lenticular image on a printing substrate |
| CN102555417B (en) * | 2010-12-23 | 2014-10-29 | 北大方正集团有限公司 | Amplitude-modulation screening method and device |
| CN102490507A (en) * | 2011-12-20 | 2012-06-13 | 天津环球磁卡股份有限公司 | Method for manufacturing colourless fluorescent ink anti-counterfeiting printing product |
| CN103786456B (en) * | 2014-02-14 | 2016-05-18 | 上海人民印刷八厂 | A kind of encryption printing process |
| CN105835553A (en) * | 2016-05-27 | 2016-08-10 | 深圳九星印刷包装集团有限公司 | Manufacturing method for invisible anti-counterfeiting mark |
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