CN105681624A - Spot color overprinted color prediction method based on spectrum - Google Patents
Spot color overprinted color prediction method based on spectrum Download PDFInfo
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- CN105681624A CN105681624A CN201610095210.2A CN201610095210A CN105681624A CN 105681624 A CN105681624 A CN 105681624A CN 201610095210 A CN201610095210 A CN 201610095210A CN 105681624 A CN105681624 A CN 105681624A
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- 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
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/58—Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction
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- 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
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6002—Corrections within particular colour systems
- H04N1/6008—Corrections within particular colour systems with primary colour signals, e.g. RGB or CMY(K)
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- 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
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6094—Colour correction or control depending on characteristics of the input medium, e.g. film type, newspaper
Abstract
The invention discloses a spot color overprinted color prediction method based on a spectrum. The method comprises the following steps: analyzing spectral reflectivity curves of a large number of spot color overprinting combinations to obtain the relationship between single spot color and an overprinted color spectral value, establishing a simple spot color overprinted color prediction model; firstly designing a color-characterized color target of the single spot color, solving a coefficient of the spot color overprinted color prediction model through the color target, namely solving a chromatic value of the overprinted color obtained through the overprinting of the spot color and other colors. The operation method disclosed by the invention is simple, and can be conveniently applied to a pre-printing digital flow, and the prediction precision meets the requirement of the industrial production; and the chromatic aberration between the spot color overprinted color prediction value and the spot color overprinted measurement value is less than 3 (Delta E is less than 3).
Description
Technical field
The invention belongs to spot color printing and digital proof field thereof, be specifically related to a kind of spot color double exposure color Forecasting Methodology based on spectrum.
Background technology
To the visual stimulus of consumer or increasing false proof purpose in order to improve product packaging, a lot of manufacturers would generally use large-area high saturation spot color when product packaging is designed, and therefore, spot color double exposure is widely used in Packaging Printing Product. Present packages printing uses substantial amounts of spot color double exposure color, to reach the product packaging purpose such as eye-catching and false proof. But there is presently no the spot color double exposure Forecasting Methodology of maturation, this makes the product with spot color double exposure be affected by very big restriction in design before printing and digital proof.
In design before printing, it is necessary to double exposure color is predicted, to facilitate designer can obtain expected result; In digital proof, it is necessary to dope the chromatic value after spot color double exposure, then according to the color characteristic file of proof press, spot color chromatic value is converted to the color that the proof press colour space is corresponding, thus the specimen page that output matching degree is high. Therefore, the color after spot color double exposure is predicted having important practical value.
In common trichroism or four-color process process, it is possible to set up model generation color characteristic file by printing the double exposure combination of different colours in advance, predict the color after polychrome double exposure by color characteristic file. But when spot color is participated, due to the substantial amounts of spot color in spot color data base, it is considered to it is extremely difficult that all of spot color combined situation generates color characteristic file. At present, industry solve the method for problems mainly by describing ink, complex relationship between printing medium and light source sets up ink trapping forecast model, these methods are required for the optimization process of complexity, optimize precision and also have much room for improvement, it is impossible to be conveniently applied to print in front numeral flow process. Accordingly, it would be desirable to set up a kind of simple and accurate spot color double exposure color prediction model.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention proposes a kind of spot color double exposure color Forecasting Methodology based on spectrum, solves the problem that spot color double exposure color forecasting inaccuracy is true.
The technical solution adopted in the present invention is: a kind of spot color double exposure color based on spectrum is predicted
Method, it is characterised in that comprise the following steps:
Step 1: to target spot color uniform sampling in dot area percentage 0-100%, generates gradual change
Spot color step-wedge;
Step 2: the corresponding spot color step-wedge forme of generation step 1 gained gradual change spot color step-wedge, respectively
With three kinds of colors white, grey, black for rear scenery double exposure, obtain color target;
Step 3: after color target is completely dried, measures the spectral reflectance values of each color lump and is saved in spot color data base; Wherein, target spot color and white double exposure color color lump as foreground, its spectral value RfRepresent; Target spot color dot area percentage in three kinds of colors white, grey, black be the color lump of 0% as rear scenery, its spectral value RbRepresent; Target spot color all color lumps that double exposure obtains in three kinds of colors white, grey, black all can as double exposure color, its spectral value RpRepresent;
Step 4: substitute into formula (1) by measuring the color lump spectral value obtained in step 3, the factor alpha of all color lumps of foreground in color target can be tried to achievei、ki、Si; It is saved into data base and generates spot color data base, obtain forecast model;
Rp=α × (Rb×Rf)k+s(1)
Step 5: use forecast model prediction spot color double exposure color; The target spot color spectral value R that dot area percentage is M is extracted from spot color data basef, corresponding with target spot color percentage ratio M factor alpha, k, S and background coloured light spectrum RbSubstitute into formula (1) respectively, try to achieve the pre-measured spectral values R of double exposure colorp, and it is transformed into chrominance space, the spot color double exposure color chromaticity values of prediction can be obtained.
In described step 1 within the scope of dot area percentage 0-100%, with 10% for interval, generate gradual change spot color step-wedge.
White white for coloured paper, Lycoperdon polymorphum Vitt described in described step 1 is 50%K, black is 100%K.
When described spot color double exposure has multiple spot color double exposure, in step 4, first try to achieve both double exposure colors according to first impression spot color and second printing spot color, both double exposure colors are tried to achieve again by this double exposure color and third printing spot color, by that analogy, recursion mode is adopted to try to achieve final double exposure coloured light spectrum.
If dot area percentage M is not embodied in spot color data base, then three coefficients of spot color when can try to achieve M percentage ratio by the method for cubic spline interpolation.
The present invention, by analyzing the spectral reflectance rate curve of a large amount of spot color double exposures combination, obtains the relation between single spot color and double exposure coloured light spectrum, sets up a kind of simple spot color double exposure forecast model. First design the colorimetric characterization color target of single spot color, solved the coefficient of spot color double exposure forecast model by this color target, the double exposure coloured light spectrum that this spot color and other color double exposures obtain can be sought. Operational approach of the present invention is simple, can be conveniently applied to print in front numeral flow process, and precision of prediction meets industrial demand; By the aberration of the spot color double exposure predictive value of gained of the present invention and spot color double exposure measured value less than 3 (i.e. Δ E < 3).
Accompanying drawing explanation
Fig. 1: be the colorimetric characterization color target of the embodiment of the present invention.
Detailed description of the invention
Understand for the ease of those of ordinary skill in the art and implement the present invention, below in conjunction with drawings and Examples, the present invention is described in further detail, should be appreciated that enforcement example described herein is merely to illustrate and explains the present invention, be not intended to limit the present invention.
Embodiment one:
The technical solution adopted in the present invention is: a kind of spot color double exposure color Forecasting Methodology based on spectrum, comprises the following steps:
Step 1: design colours characterizes color target. The target spot color 1 dot percentage with 10% is for interval from 0-100% uniform sampling, respectively with (paper is white) in vain, ash (50%K), black (100%K) three kinds of color double exposures (as shown in Figure 1).Wherein, the color first printed is called rear scenery (namely 34,35,36), and the color of rear printing is called foreground (i.e. color lump 1～33);
Step 2: select offset printing mode in the present embodiment, printer is graceful rowland Ultima-R707-3BLV, printable fabric is Samsung paper industry 157g art paper, ink is Toyo Ink, and printing color-sequential is that (chromatic value Lab is K C M Y spot color 1 on the spot: 58.76 ,-32.93 ,-48.34). Color target described in step 1 is printed;
Step 3: after color target is completely dried, uses the spectral reflectance values of GretagMacbethSpectrolino each color lump of spectrophotometer measurement. Wherein, the double exposure color that the first row spot color is white with paper is as foreground (i.e. color lump 1～11), its spectral value RfRepresent; In three row color lumps, spot color percentage ratio is that the color lump of 0 is as rear scenery (i.e. color lump 1,12,23), its spectral value RbRepresent; The first row, the second row, all color lumps of the third line all can as double exposure color (i.e. color lump 1～33), its spectral value RpRepresent. Spot color data base it is saved in after DATA REASONING;
Step 4: substitute into formula (1) by measuring the color lump spectral value obtained in step 3. Such as: foreground color lump 1 and rear scenery color lump 1 double exposure obtain color lump 1, foreground color lump 1 obtains color lump 12 with rear scenery color lump 12 double exposure, foreground color lump 1 obtains color lump 23 with rear scenery color lump 23 double exposure, three groups of double exposure combinations substitute into formula (1) and can obtain three prescription journeys, can try to achieve the factor alpha of foreground color lump 11、k1、S1By that analogy, foreground color lump i obtains corresponding double exposure color respectively with rear scenery color lump 1,12,23 double exposure, substitutes into formula (1), can try to achieve the factor alpha of foreground color lump i in color targeti、ki、Si(i=1:11). Try to achieve three coefficients of different weight percentage spot color, be saved into data base and can complete the foundation of model;
Rp=α × (Rb×Rf)k+S(2)
Step 5: use forecast model prediction spot color double exposure color. The target spot color spectral value R of t percentage ratio is extracted from data basef(foreground) factor alpha corresponding with target spot color percentage ratio t, k, S and background coloured light spectrum RbSubstitute into formula (1) respectively, try to achieve the pre-measured spectral values R of double exposure colorp, and it is transformed into chrominance space, the spot color double exposure color chromaticity values of prediction can be obtained. In the present embodiment, t=100%, 50%, 25%; Background colour respectively 25%M (magenta), 100%Y (yellow), 25%K (black). Wherein, during t=25%, three coefficients of spot color 1 are not in spot color data base, then three coefficients of spot color 1 when can try to achieve t=25% by the method for cubic spline interpolation.
Step 6: by measure spectrum value RmWith pre-measured spectral values RpIt is transformed into chrominance space, uses L respectivelymambmWith LpapbpRepresenting, utilizing CIEDE2000 colour difference formula to seek the Chroma Error Δ E of measured value and predictive value, result is as shown in table 1.
Table 1:
Embodiment two:
The technical solution adopted in the present invention is: a kind of spot color double exposure color Forecasting Methodology based on spectrum, comprises the following steps:
Step 1: design colours characterizes color target. The target spot color 2 dot percentage with 10% is for interval from 0-100% uniform sampling, respectively with (paper is white) in vain, ash (50%K), black (100%K) three kinds of color double exposures (as shown in Figure 1). Wherein, the color first printed is called rear scenery (namely 34,35,36), and the color of rear printing is called foreground (i.e. color lump 1～33);
Step 2: select offset printing mode in the present embodiment, printer is graceful rowland Ultima-R707-3BLV, printable fabric is Samsung paper industry 157g art paper, and ink is Toyo Ink, and printing color-sequential is that (chromatic value Lab is K C M Y spot color 2: 49.26,73.87 ,-2.19).Color target described in step 1 is printed;
Step 3: after color target is completely dried, uses the spectral reflectance values of GretagMacbethSpectrolino each color lump of spectrophotometer measurement. Wherein, the double exposure color that the first row spot color is white with paper is as foreground (i.e. color lump 1～11), its spectral value RfRepresent; In three row color lumps, spot color percentage ratio is that the color lump of 0 is as rear scenery (i.e. color lump 1,12,23), its spectral value RbRepresent; The first row, the second row, all color lumps of the third line all can as double exposure color (i.e. color lump 1～33), its spectral value RpRepresent. it is saved in spot color data base after DATA REASONING;
Step 4: substitute into formula (1) by measuring the color lump spectral value obtained in step 3. Such as: foreground color lump 1 and rear scenery color lump 1 double exposure obtain color lump 1, foreground color lump 1 obtains color lump 12 with rear scenery color lump 12 double exposure, foreground color lump 1 obtains color lump 23 with rear scenery color lump 23 double exposure, three groups of double exposure combinations substitute into formula (1) and can obtain three prescription journeys, can try to achieve the coefficient a of foreground color lump 11、k1、S1. By that analogy, foreground color lump i obtains corresponding double exposure color respectively with rear scenery color lump 1,12,23 double exposure, substitutes into formula (1), can try to achieve coefficient ai, k of foreground color lump i in color targeti、Si(i=1:11). Try to achieve three coefficients of different weight percentage spot color, be saved into data base and can complete the foundation of model;
Rp=α × (Rb×Rf)k+S(3)
Step 5: use forecast model prediction spot color double exposure color. The target spot color spectral value R of t percentage ratio is extracted from data basef(foreground) factor alpha corresponding with target spot color percentage ratio t, k, s and background coloured light spectrum RbSubstitute into formula (1) respectively, try to achieve the pre-measured spectral values R of double exposure colorp, and it is transformed into chrominance space, the spot color double exposure color chromaticity values of prediction can be obtained. In the present embodiment, t=100%, 50%, 25%; Background colour respectively 25%C (cyan), 100%Y (yellow), 25%K (black). Wherein, during t=25%, three coefficients of spot color 2 are not in spot color data base, then three coefficients of spot color 2 when can try to achieve t=25% by the method for cubic spline interpolation.
Step 6: by measure spectrum value RmWith pre-measured spectral values RpIt is transformed into chrominance space, uses Lma respectivelymbmWith LpapbpRepresenting, utilizing CIEDE2000 colour difference formula to seek the Chroma Error Δ E of measured value and predictive value, result is as shown in table 2.
Table 2:
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; therefore the restriction to scope of patent protection of the present invention can not be thought; those of ordinary skill in the art is under the enlightenment of the present invention; under the ambit protected without departing from the claims in the present invention; can also making replacement or deformation, each fall within protection scope of the present invention, the scope that is claimed of the present invention should be as the criterion with claims.
Claims (5)
1. the spot color double exposure color Forecasting Methodology based on spectrum, it is characterised in that comprise the following steps:
Step 1: to target spot color uniform sampling in dot area percentage 0-100%, generates gradual change spot color step-wedge;
Step 2: the corresponding spot color step-wedge forme of generation step 1 gained gradual change spot color step-wedge, respectively with three kinds of colors white, grey, black for rear scenery double exposure, obtains color target;
Step 3: after color target is completely dried, measures the spectral reflectance values of each color lump and is saved in spot color data base; Wherein, target spot color and white double exposure color color lump as foreground, its spectral value RfRepresent;Target spot color dot area percentage in three kinds of colors white, grey, black be the color lump of 0% as rear scenery, its spectral value RbRepresent; Target spot color all color lumps that double exposure obtains in three kinds of colors white, grey, black all can as double exposure color, its spectral value RpRepresent;
Step 4: substitute into formula (1) by measuring the color lump spectral value obtained in step 3, the factor alpha of all color lumps of foreground in color target can be tried to achievei、ki、Si; It is saved into data base and generates spot color data base, obtain forecast model;
Rp=α × (Rb×Rf)k+S(1)
Step 5: use forecast model prediction spot color double exposure color; The target spot color spectral value R that dot area percentage is M is extracted from spot color data basef, corresponding with target spot color percentage ratio M factor alpha, k, S and background coloured light spectrum RbSubstitute into formula (1) respectively, try to achieve the pre-measured spectral values R of double exposure colorp, and it is transformed into chrominance space, the spot color double exposure color chromaticity values of prediction can be obtained.
2. the spot color double exposure color Forecasting Methodology based on spectrum according to claim 1, it is characterised in that: in described step 1 within the scope of dot area percentage 0-100%, with 10% for interval, generate gradual change spot color step-wedge.
3. the spot color double exposure color Forecasting Methodology based on spectrum according to claim 1, it is characterised in that: white white for coloured paper, the Lycoperdon polymorphum Vitt described in described step 1 is 50%K, black is 100%K.
4. the spot color double exposure color Forecasting Methodology based on spectrum according to claim 1, it is characterized in that: when described spot color double exposure has multiple spot color double exposure, in step 4, first try to achieve both double exposure colors according to first impression spot color and second printing spot color, both double exposure colors are tried to achieve again by this double exposure color and third printing spot color, by that analogy, recursion mode is adopted to try to achieve final double exposure coloured light spectrum.
5. the spot color double exposure color Forecasting Methodology based on spectrum according to claim 1, it is characterised in that: if dot area percentage M is not embodied in spot color data base, then three coefficients of spot color when can try to achieve M percentage ratio by the method for cubic spline interpolation.
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Cited By (4)
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| CN108632498A (en) * | 2017-03-23 | 2018-10-09 | 柯尼卡美能达株式会社 | Information processing unit, image forming apparatus and computer-readable recording medium |
| CN109657311A (en) * | 2018-12-07 | 2019-04-19 | 齐鲁工业大学 | A kind of 3D paper-based products appearance luma prediction method |
| CN110780828A (en) * | 2019-10-15 | 2020-02-11 | 中荣印刷集团股份有限公司 | Seven-primary-color high-fidelity digital printing method |
| CN110780827A (en) * | 2019-10-15 | 2020-02-11 | 中荣印刷集团股份有限公司 | Seven-primary-color high-fidelity flexible printing method |
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| CN108632498A (en) * | 2017-03-23 | 2018-10-09 | 柯尼卡美能达株式会社 | Information processing unit, image forming apparatus and computer-readable recording medium |
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| CN110780828A (en) * | 2019-10-15 | 2020-02-11 | 中荣印刷集团股份有限公司 | Seven-primary-color high-fidelity digital printing method |
| CN110780827A (en) * | 2019-10-15 | 2020-02-11 | 中荣印刷集团股份有限公司 | Seven-primary-color high-fidelity flexible printing method |
| CN110780828B (en) * | 2019-10-15 | 2023-07-11 | 中荣印刷集团股份有限公司 | Seven-primary-color high-fidelity digital printing method |
| CN110780827B (en) * | 2019-10-15 | 2023-08-18 | 中荣印刷集团股份有限公司 | Seven-primary-color high-fidelity flexography method |
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