WO2012083885A1 - 用于凹版印刷的加网方法和装置 - Google Patents
用于凹版印刷的加网方法和装置 Download PDFInfo
- Publication number
- WO2012083885A1 WO2012083885A1 PCT/CN2011/084593 CN2011084593W WO2012083885A1 WO 2012083885 A1 WO2012083885 A1 WO 2012083885A1 CN 2011084593 W CN2011084593 W CN 2011084593W WO 2012083885 A1 WO2012083885 A1 WO 2012083885A1
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- WO
- WIPO (PCT)
- Prior art keywords
- area
- formula
- tone
- mesh
- deep
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F5/00—Screening processes; Screens therefor
- G03F5/20—Screening processes; Screens therefor using screens for gravure printing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
Definitions
- This invention relates to the field of printing and, in particular, to a screening method and apparatus for gravure printing. Background technique
- Gravure printing referred to as gravure printing, has its dots located in a completely concave form with respect to the plane of the sheet. At the time of printing, the ink is filled in the recessed dots and transferred to the medium by imprinting.
- the above characteristics of gravure printing determine that there is a wall-like interval between the dots and the dots, collectively referred to as the "net wall.” Since the gravure plate-making method, whether by manual etching or electronic engraving, forms a concave dot on the plate, the variation of the "net wall" is particularly important in the dark-adjusted area.
- the inventor has found through research that the shape and variation of the dark-adjusted area "net wall” directly affects the reduction and texture of the dark part.
- the "net wall” In the process of gravure printing, as the level gradually darkens, that is, the dots gradually become larger, the "net wall” is relatively thinner, and the thinner the “net wall” is, the more likely it is to have cracks or uneven thickness, which causes Dark tones are prone to texture or
- the present invention is directed to a screening method and apparatus for gravure printing to solve the problem of the prior art generating a water ripple phenomenon such as a texture.
- a screening method for gravure printing comprising: dividing a plurality of types of regions according to a range of brightness; and generating different mesh-shaped dots for different types of regions.
- a screening apparatus for gravure printing comprising: a dividing module for dividing a plurality of types of regions according to a brightness range; and a generating module for different classes The area generates dots of different mesh shapes.
- the screening method and apparatus for gravure printing according to the above embodiment of the present invention overcomes the problem of water ripple phenomenon such as texture and the like in the prior art because of the use of a plurality of different mesh shapes, and improves the printing quality.
- FIG. 1 is a flow chart showing a screening method for gravure printing according to an embodiment of the present invention
- Figure 2 illustrates a dot shape in accordance with a preferred embodiment of the present invention
- FIG. 3 shows a spatial symmetry diagram of a halftone dot according to a preferred embodiment of the present invention
- FIG. 4 shows a halftone shape of a midtone-deep tone region in accordance with a preferred embodiment of the present invention
- Figure 2 shows a tiling effect of a gravure dot according to a preferred embodiment of the present invention
- Figure ⁇ shows a screen for gravure printing according to an embodiment of the present invention Schematic diagram of the device.
- FIG. 1 shows a flow chart of a screening method for gravure printing according to an embodiment of the present invention, including:
- Step S10 dividing a plurality of types of regions according to the brightness range
- Step S20 generating different mesh-shaped network points for different types of regions.
- step S10 includes: setting a region with a luminance range of [0, a shallow adjustment region, and a region having a luminance range of [ Pe Pe ] a shallow tone-intermediate tone region, and a brightness range
- the area of [ P e , Pef 3 ] is the midtone-deep tone area, and the area of the brightness range [ Pe , 1] is the deep tone area.
- the preferred embodiment divides four types of regions according to the brightness, so that four different mesh shapes can be used, the calculation amount is small, and the printing quality can be remarkably improved.
- the Pei "i is set to 0.25, the Pe is 0.5, and the ⁇ is 0.8.
- the inventors conducted a large number of experiments and found that the division is [0, 0.25], [0.25, 0.5], [0.5, 0.8], [0.8, 1] four types of areas, the best effect.
- the present invention is not limited to these specific values, in practice, the feature points of the division of the brightness range are set to be approximately equal to these values, It is also within the spirit of the invention to achieve better results.
- Figure 2 illustrates a dot shape in accordance with a preferred embodiment of the present invention.
- the mesh shape changes regularly.
- the preferred embodiment of the present invention uses the shaded portion of Figure 3 as a feature mesh to generate the entire mesh.
- the computer implemented method of generating the various mesh shapes of FIG. 2 will be described in detail below.
- step S20 includes generating a network point of the first mesh shape (ie, pictures 1-3 in FIG. 2) in the shallow tone region, including:
- ⁇ for example ⁇ (x, _y)
- the preferred embodiment presents a mathematical depiction of the mesh shape of the shallow tuning region of Figure 2, which can be easily implemented by a computer to achieve gravure screening.
- Figure 4 illustrates the dot shape of a midtone-deep tone region in accordance with a preferred embodiment of the present invention.
- the contour of the mesh has a cosine curve forming four sides, and the 1/4 circle is connected to the cosine curve to form a corner.
- the characteristic mesh shape uses four 1/4 circles to connect the four cosine curves, and the entire mesh shape gradually increases until the highest point of the two ends of the cosine curve just reaches the edge of the dot space (80% of the dots are thus called Figure 4 shows the process.
- the brightness range is [0.5, 0.8], and the dot function /(, We(0.5,0.8).
- step S20 includes generating a mesh point of the third mesh (ie, pictures 6-7 in FIG. 2) in the midtone-deep tone region, including:
- the unit space of the intermediate tone-deep tone area is established, and the center of the network point is taken as the origin, and X, y are the coordinates in the network point;
- Equation 4-6 constitutes the curve cluster equation D ( O, ⁇ D( I ⁇ [0,1] ⁇ , where ' is the level in the process of mesh change. It reflects the range of brightness in this range. It can be represented by a curve equation.
- the preferred embodiment gives a mathematical depiction of the mesh shape of the midtone to deep tune region of Fig. 2, which can be easily implemented by a computer to achieve gravure screening.
- y is output with the value of the function of formula 7-9 below: f i ( x or f 2 ( x compares size), thereby judging (x, y) at n Which of the two curves in Equation 7-9 is enclosed in a small area, the criterion is: the value is smaller than the formula 7-9 in which the value of ⁇ is larger, and the formula 7-9 is larger than the value of ⁇ ;
- ⁇ is an integer greater than 1, determined by the following system of equations:
- Equation 1-3 ae (0,0.1", [0,l].
- Equations 1-3 form the curve cluster equation D ( ), ⁇ D( I ⁇ [0,1] ⁇ , where ' is the level in the process of mesh change. It reflects the range of brightness in this range. It can be expressed by a curve equation.
- each point (X, y) in this region varies as follows: ⁇ , l 25 ⁇ l ⁇ l ⁇ ⁇ /2 , G ⁇ 25 ⁇ I _y
- the mesh pattern for generating the shallow tone-middle tone region is basically the same as the mesh pattern for generating the midtone-deep tone region, except that the size of the latter is reduced, and the expansion ratio is 1:
- the dot function is also obtained, and the output dot function value is 1/2 of the function value of the shallow tone-intermediate tone region.
- the preferred embodiment gives a mathematical depiction of the mesh shape of the shallow to midtone region of Figure 2.
- the brightness range of this area is [0.8,1], and the change rule of the dot in this area is:
- the characteristic mesh 80% cosine curve continuously shrinks to the point (0,1), and the two segments 1/8 The arc also continuously contracts smoothly to (- 1,1) and (1,1).
- step S20 includes generating a network of a fourth mesh (ie, pictures 8-10 in FIG. 2) in the deep-adjusted region, including:
- y is output with the value of the function of formula 7-9 below: f i ( x or f 2 ( x compares size), thereby judging ( x , y) at n Which of the two curves in Equation 7-9 is enclosed in a small area, the criterion is: the value is smaller than the formula 7-9 in which the value of ⁇ is larger, and the formula 7-9 is larger than the value of ⁇ ;
- Equation 7 Equation 7:
- Equation 7-9 constitutes the curve cluster equation D ( ), ⁇ D( I ⁇ [0,1] ⁇ , where is the level in the process of mesh change. It reflects that within this brightness range, each level is available.
- the preferred embodiment presents a mathematical depiction of the mesh shape of the deep-adjusted region of Figure 2, which can be easily implemented by a computer to achieve gravure screening.
- Figure 6 illustrates the tiling effect of screen dots in accordance with a preferred embodiment of the present invention.
- the preferred embodiment of the present invention optimizes the mesh shape by optimizing the mesh shape, and optimizes the shape of the edge of the dot, thereby finally improving the printability of the mesh wall and eliminating the mesh caused by the concave printed plate square dot.
- the wall is prone to rupture and diarrhea such as water ripples in the dark, which expands the range of gravure reproduction, which greatly improves the quality of gravure printing.
- Fig. 7 shows a schematic view of a screening device for gravure printing according to an embodiment of the present invention, comprising:
- a dividing module 10 configured to divide a plurality of types of regions according to a brightness range
- the generating module 20 is configured to generate different mesh points for different types of regions.
- This device improves print quality.
- the dividing module sets a region with a brightness range of [0, Pei "i] as a shallow adjustment region, a region with a luminance range of [ Pef i , Pef 2] as a shallow tone-intermediate tone region, and a brightness range of [ P ,
- the area is a midtone-deep tone area, and the area of the brightness range [ Pe , 1] is a deep tone area.
- the preferred embodiment divides four types of areas according to the brightness, so that four different mesh shapes can be used, and the calculation amount can be calculated. Not big, but also can significantly improve the quality of printing.
- the generating module comprises:
- a shallow adjustment module configured to generate a first mesh dot in the shallow adjustment region, which will set the coordinates in the dot of the shallow region
- ⁇ ⁇ , ⁇ ) —m +—-Jn -(x-m) ⁇ : e“ m, m +— n ⁇
- the integer, f is determined by the following system of equations:
- Equation 6 r ( , , ⁇ 2 ⁇ ; ⁇ '7 ⁇ ; c G ⁇ , - ⁇
- Equation 4-6 ae (0,0.1], [o,l];
- Equation 7 x + td
- the above-mentioned embodiment of the present invention based on the original square gravure printing mesh shape, according to the special requirements for the dot in the gravure printing process, by further improving the mesh shape, using the cosine curve
- the shape control mechanism optimizes the edge shape of the dot and changes from the original straight line to a smooth curve, which finally improves the printability of the mesh wall formed by the gravure dot, and solves the problem of the mesh wall caused by the concave printed plate square dot.
- the rupture and the appearance of water ripples and other dysentery in the dark part ensure the effective improvement of the density of the gravure, thereby effectively expanding the level of reproduction in the gravure process, and ultimately improving the quality of gravure printing.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Facsimile Image Signal Circuits (AREA)
- Image Processing (AREA)
- Color, Gradation (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013545035A JP5843883B2 (ja) | 2010-12-24 | 2011-12-24 | 凹版印刷用スクリーニング方法と装置 |
| US13/996,967 US9182661B2 (en) | 2010-12-24 | 2011-12-24 | Screening method and apparatus for use in intaglio printing |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010621998.9A CN102529307B (zh) | 2010-12-24 | 2010-12-24 | 用于凹版印刷的加网方法和装置 |
| CN201010621998.9 | 2010-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012083885A1 true WO2012083885A1 (zh) | 2012-06-28 |
Family
ID=46313192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2011/084593 Ceased WO2012083885A1 (zh) | 2010-12-24 | 2011-12-24 | 用于凹版印刷的加网方法和装置 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9182661B2 (zh) |
| JP (1) | JP5843883B2 (zh) |
| CN (1) | CN102529307B (zh) |
| WO (1) | WO2012083885A1 (zh) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108909151A (zh) * | 2018-09-13 | 2018-11-30 | 南京林业大学 | 一种凹版印刷苯环网形结构 |
| CN117719245A (zh) * | 2023-07-11 | 2024-03-19 | 杭州正乾机电有限公司 | 一种激光雕刻凹版及其加工方法 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11342679A (ja) * | 1998-06-01 | 1999-12-14 | Dainippon Printing Co Ltd | グラビア印刷方法、印刷版および印刷物 |
| CN1624583A (zh) * | 2004-12-20 | 2005-06-08 | 北京北大方正电子有限公司 | 一种用于打印机的线圆形网点的生成方法 |
| CN1648769A (zh) * | 2004-01-30 | 2005-08-03 | 株式会社新克 | 凹版印刷法与凹板印刷品 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2958245B2 (ja) * | 1994-09-06 | 1999-10-06 | 大日本スクリーン製造株式会社 | 印刷画像の作成方法 |
| IL116885A0 (en) * | 1996-01-24 | 1996-05-14 | Scitex Corp Ltd | An imaging apparatus for exposing a printing member |
| JP3561398B2 (ja) * | 1997-09-24 | 2004-09-02 | 大日本スクリーン製造株式会社 | 画素の階調再現を利用した網点画像記録方法および装置 |
| US6532082B1 (en) * | 1998-07-16 | 2003-03-11 | Esko-Graphics, N.V. | Halftone printing plates containing microscopic perforations and methods for producing same |
| JP2000333014A (ja) * | 1999-05-20 | 2000-11-30 | Minolta Co Ltd | 画像処理装置および画像処理方法並びに画像処理手順を記憶したコンピュータ読み取り可能な記憶媒体 |
| JP4257708B2 (ja) * | 2004-07-20 | 2009-04-22 | シャープ株式会社 | 影付き文字領域判定方法、画像処理方法、影付き文字領域判定装置、画像処理装置、画像形成装置、画像読取装置、コンピュータプログラム及び記録媒体 |
| US7728860B2 (en) * | 2005-08-12 | 2010-06-01 | Ricoh Company, Ltd. | Method for image processing and image processing apparatus |
| CN100377567C (zh) * | 2005-10-26 | 2008-03-26 | 北京北大方正电子有限公司 | 在多位成像深度设备上的调频调幅混合网点网型控制方法 |
| JP5194356B2 (ja) * | 2005-12-01 | 2013-05-08 | 大日本印刷株式会社 | グラビア印刷方法および印刷物 |
-
2010
- 2010-12-24 CN CN201010621998.9A patent/CN102529307B/zh not_active Expired - Fee Related
-
2011
- 2011-12-24 WO PCT/CN2011/084593 patent/WO2012083885A1/zh not_active Ceased
- 2011-12-24 US US13/996,967 patent/US9182661B2/en not_active Expired - Fee Related
- 2011-12-24 JP JP2013545035A patent/JP5843883B2/ja not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11342679A (ja) * | 1998-06-01 | 1999-12-14 | Dainippon Printing Co Ltd | グラビア印刷方法、印刷版および印刷物 |
| CN1648769A (zh) * | 2004-01-30 | 2005-08-03 | 株式会社新克 | 凹版印刷法与凹板印刷品 |
| CN1624583A (zh) * | 2004-12-20 | 2005-06-08 | 北京北大方正电子有限公司 | 一种用于打印机的线圆形网点的生成方法 |
Non-Patent Citations (2)
| Title |
|---|
| JIANG, WENYAN ET AL.: "Influence of Dot's Shape on Dot Reproduction Attributes of Offset Printing", PACKAGING ENGINEERING, vol. 31, no. 1, January 2010 (2010-01-01), pages 82 - 89 * |
| SONG, YUEHONG ET AL.: "Research into the Implementation of Non-uniform Shape Dot and Its Transmission Characteristics", JOURNAL OF BEIJING INSTITUTE OF GRAPHIC COMMUNICATION, vol. 12, no. 4, December 2004 (2004-12-01), pages 7 - 9 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US9182661B2 (en) | 2015-11-10 |
| CN102529307B (zh) | 2015-01-21 |
| JP5843883B2 (ja) | 2016-01-13 |
| CN102529307A (zh) | 2012-07-04 |
| US20140033937A1 (en) | 2014-02-06 |
| JP2014506411A (ja) | 2014-03-13 |
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