CN103770489A - Printing method of color image for anti-counterfeiting - Google Patents
Printing method of color image for anti-counterfeiting Download PDFInfo
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- CN103770489A CN103770489A CN201410068716.5A CN201410068716A CN103770489A CN 103770489 A CN103770489 A CN 103770489A CN 201410068716 A CN201410068716 A CN 201410068716A CN 103770489 A CN103770489 A CN 103770489A
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Abstract
The invention discloses a printing method of a color image for anti-counterfeiting. The printing method comprises the following steps of obtaining original color image information including digital ink color information which is forme by obtaining an original color image and processing the original color image, processing the digital ink color information to form a color code, performing gamut color separation processing on the original color image, performing gray balance processing on the original color image, performing nonlinear ink compensation processing on the original color image, and selecting an anticounterfeiting ink to print the previously processed color image to obtain the desired color image for anti-counterfeiting. The printing method has the advantages that during printing, color distortion is avoided, the figure and the color of the original color image can be reproduced very clearly, and in the meantime, multiple anti-counterfeiting processing is performed on the original color image to be printed so that the anti-counterfeiting level of the printed color image can be improved, and as a result, the color image can be effectively prevented from being copied and printed.
Description
Technical field
The present invention relates to a kind of printing process of coloured image, relate in particular to a kind of printing process for false proof coloured image.
Background technology
Earlier 1900s, is applied as the printing technology of mark with four look photo colour separation technology, realized full-color image print reproduction.Since the seventies, along with the development of computer technology, four look electronic scanning technology start application gradually, and constantly improve so far.Traditional colored printing generally adopts C, M, Y, K tetra-color inks to print, and therefore, in the time carrying out coloured image printing, all carries out CMYK four-color separation model, uses and fixes four kinds of primary colours ink.Adopt the coloured image of four-color process to there is following defect: (1) colour gamut is little and fixing, and it is larger that high saturated color copies loss, only can reproduce 60% left and right of original image; (2) netting twine frequency modulation is generally at 175lpi, and netting twine width is generally at 142 microns, and contrast level are more obvious, and color range distortion is larger, and colour solid sense is poor; (3) the false proof difficulty of print product is lower, much just reach false proof object by anti-forgery ink printing, and present anti-forgery ink has also easily been bought, the image therefore printing is very easily copied arbitrarily, the indistinguishable true and false, does not have corresponding antifalse effect.
Summary of the invention
The technical problem to be solved in the present invention is in order to overcome technological deficiency recited above, and a kind of printing process for false proof coloured image is provided.
In order to solve technical problem recited above, the present invention takes following technical scheme:
For a printing process for false proof coloured image, include following steps:
Obtain original color image information, comprise and obtain original color image and original color image is processed to the ink colors digital information forming;
Ink colors digital information is processed, formed color password;
Original color image is carried out to the processing of colour gamut color separation;
Original color image is carried out to grey balance processing;
Original color image is carried out to the processing of ink nonlinear compensation;
Select anti-forgery ink to print carrying out above-mentioned coloured image after treatment, obtain needed for false proof coloured image.
Original color image is carried out to the processing of ink nonlinear compensation also referred to as the processing of printing down compensating for loss and damage.
Described original color image is to take pictures or by original image is scanned and obtained by digital camera.
Original color image is carried out to the processing of colour gamut color separation and comprised the outer color separation processing of color separation processing and colour gamut in colour gamut, and be point seven look processing, be respectively blue or green, pinkish red, yellow, black, orange, medium green and dark blue seven looks.
Original color image is carried out to grey balance processing and comprised neutral gray balance processing and colored grey balance processing.
Before coloured image after treatment is printed, need carry out contrast incremental processing, by netting twine frequency increase be transferred to 250-350lpi, by netting twine reduced width to 72 micron.
Wherein, color password is processed and formed to ink colors digital information, as the false proof processing of first of coloured image; Original color image is carried out to the processing of colour gamut color separation, as the false proof processing of second of coloured image; Original color image is carried out to grey balance processing, as the false proof processing of second of coloured image; And print again by anti-forgery ink, be the coloured image tetra-false proof processing in road.
Anti-forgery ink is also referred to as false proof printing ink, refer to and there is anti-fraud functional ink, this ink is made up of colorant, link stuff and ink addition agent, the specialty printing ink that adds the anti-fake material of property in ink vehicle and process through special process.Anti-forgery ink can be divided into letterpress inks, gravure printing ink, stencil printing ink, lithographic printing (offset printing) ink and aqueous flexible plate printing ink etc. by printing form.
Color password is to utilize the identical double exposure of print color vision site, and different metamerism characteristics is determined.The repetition probability of color password is tens billion of/mono-, therefore has " two wires is false proof " function truly.The ink using through design, can increase imitated difficulty.In the coloured image of the present invention printing, can by password color dexterously Combination Design become different pattern, or disperse to be arranged in different parts, make imitated person be difficult for discovering and analyzing.Can also utilize fine definition printing net-point size and shape to change, netting twine combination of frequency etc. increase the technical characterictic of color password, and these can further increase imitated difficulty.
Printing process provided by the invention, when printing, color is undistorted, can very clearly reproduce figure and the color of original color image, the original color image of need printing has been carried out to the false proof processing of multiple tracks simultaneously, can increase the false proof rank of the coloured image of printing, effectively prevent that others from carrying out copying and printing to coloured image.
The present invention is realizing on the basis of personalized color printing copy function, through the suitable adjustment of colour separating model, can also form the false proof function of high fidelity of chromatics, the coloured image of each printing all comprises false proof colour separating model and multiple color password, it is all not identical that each user uses, anyone uses printed matter of the present invention to copy for original copy, and duplicate can be identified simply exactly.
The specific embodiment
For a printing process for false proof coloured image, include following steps:
Obtain original color image information, comprise and obtain original color image and original color image is processed to the ink colors digital information forming;
Ink colors digital information is processed, formed color password;
Original color image is carried out to the processing of colour gamut color separation;
Original color image is carried out to grey balance processing;
Original color image is carried out to the processing of ink nonlinear compensation;
Select anti-forgery ink to print carrying out above-mentioned coloured image after treatment, obtain needed for false proof coloured image.
Wherein, original color image is carried out to the processing of ink nonlinear compensation also referred to as the processing of printing down compensating for loss and damage; Color password is processed and formed to ink colors digital information, as the false proof processing of first of coloured image; Original color image is carried out to the processing of colour gamut color separation, as the false proof processing of second of coloured image; Original color image is carried out to grey balance processing, as the coloured image tri-false proof processing in road; And print again by anti-forgery ink, be the coloured image tetra-false proof processing in road.
Select anti-forgery ink to print carrying out above-mentioned coloured image after treatment, obtain needed for false proof coloured image.
Original color image is carried out to the processing of ink nonlinear compensation also referred to as the processing of printing down compensating for loss and damage.
Described original color image is to take pictures or by original image is scanned and obtained by digital camera.
Original color image is carried out to the processing of colour gamut color separation and comprised the outer color separation processing of color separation processing and colour gamut in colour gamut, and be point seven look processing, be respectively blue or green, pinkish red, yellow, black, orange, medium green and dark blue seven looks.
Original color image is carried out to grey balance processing and comprised neutral gray balance processing and colored grey balance processing.
Before coloured image after treatment is printed, need carry out contrast incremental processing, by netting twine frequency increase be transferred to 250-350lpi, by netting twine reduced width to 72 micron.
Color password is to utilize the identical double exposure of print color vision site, and different metamerism characteristics is determined.The repetition probability of color password is tens billion of/mono-, therefore has " two wires is false proof " function truly.
Adopt the anti-counterfeit recognition step of the coloured image that printing process above obtains to be:
First original color image is scanned, obtain original color image information, comprise and obtain original color image and original color image is processed to the original ink color digital information forming;
Original ink color digital information is processed, formed primitive color password, primitive color password is stored in database;
Original color image is carried out to the processing of colour gamut color separation, obtains the original color color separation information in the outer and/or colour gamut of colour gamut, by the original color color separation information storage obtaining to database;
Original color image is carried out to grey balance processing, obtains original grey balance information (comprising neutral gray balance information and/or colored grey balance information), by the original grey balance information storage obtaining to database;
Scanning needs the coloured image to be identified of identification, obtains color image information to be identified, comprises coloured image to be identified and ink colors digital information to be identified;
Ink colors digital information to be identified is processed, obtained new color password, new color password and primitive color password are compared, if two color passwords are consistent, coloured image to be identified is consistent with original color image, is genuine piece; Otherwise coloured image to be identified is fakement;
Coloured image to be identified is carried out to the processing of colour gamut color separation, obtain the new color separation information outside colour gamut and/or in colour gamut, new color separation information and original color color separation information are compared, if two color separation information are consistent, coloured image to be identified is consistent with original color image, is genuine piece; Otherwise coloured image to be identified is fakement;
Coloured image to be identified is carried out to grey balance processing, obtain new grey balance information (comprising neutral gray balance information and/or colored grey balance information), new grey balance information and original grey balance information are compared, if two grey balance information are consistent, coloured image to be identified is consistent with original color image, is genuine piece; Otherwise coloured image to be identified is fakement.
Claims (5)
1. for a printing process for false proof coloured image, it is characterized in that, include following steps:
Obtain original color image information, comprise and obtain original color image and original color image is processed to the ink colors digital information forming;
Ink colors digital information is processed, formed color password;
Original color image is carried out to the processing of colour gamut color separation;
Original color image is carried out to grey balance processing;
Original color image is carried out to the processing of ink nonlinear compensation;
Select anti-forgery ink to print carrying out above-mentioned coloured image after treatment, obtain needed for false proof coloured image.
2. printing process as claimed in claim 1, is characterized in that: described original color image is to take pictures or by original image is scanned and obtained by digital camera.
3. printing process as claimed in claim 1, it is characterized in that: original color image is carried out to the processing of colour gamut color separation and comprised color separation processing and the outer color separation processing of colour gamut in colour gamut, and be point seven look processing, be respectively blue or green, pinkish red, yellow, black, orange, medium green and dark blue seven looks.
4. printing process as claimed in claim 1, is characterized in that: original color image is carried out to grey balance processing and comprised neutral gray balance processing and colored grey balance processing.
5. the printing process as described in as arbitrary in claim 1-4, is characterized in that: before coloured image after treatment is printed, need carry out contrast incremental processing, netting twine frequency is increased be transferred to 250-350lpi, by netting twine reduced width to 72 micron.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410068716.5A CN103770489A (en) | 2014-02-27 | 2014-02-27 | Printing method of color image for anti-counterfeiting |
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| CN201410068716.5A CN103770489A (en) | 2014-02-27 | 2014-02-27 | Printing method of color image for anti-counterfeiting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978783A (en) * | 2014-05-31 | 2014-08-13 | 齐鲁工业大学 | Control method for static digital printing dot halftone |
| 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 |
| CN111976325A (en) * | 2020-08-18 | 2020-11-24 | 杭州僖磊科技发展有限公司 | Traceable printing method and traceable printing system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978783A (en) * | 2014-05-31 | 2014-08-13 | 齐鲁工业大学 | Control method for static digital printing dot halftone |
| 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 |
| CN111976325A (en) * | 2020-08-18 | 2020-11-24 | 杭州僖磊科技发展有限公司 | Traceable printing method and traceable printing system |
| WO2022037023A1 (en) * | 2020-08-18 | 2022-02-24 | 胡建华 | Traceable printing method and system |
| CN111976325B (en) * | 2020-08-18 | 2023-01-20 | 杭州僖磊科技发展有限公司 | Traceable printing method and traceable printing system |
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Application publication date: 20140507 |