CN103042853A - Special colour simulation method - Google Patents

Special colour simulation method Download PDF

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CN103042853A
CN103042853A CN2013100216980A CN201310021698A CN103042853A CN 103042853 A CN103042853 A CN 103042853A CN 2013100216980 A CN2013100216980 A CN 2013100216980A CN 201310021698 A CN201310021698 A CN 201310021698A CN 103042853 A CN103042853 A CN 103042853A
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color
new
spot
examination
printing
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CN103042853B (en
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曹员珍
范崟
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SHANGHAI ZIEN DIGITAL TECHNOLOGY Co Ltd
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SHANGHAI ZIEN DIGITAL TECHNOLOGY Co Ltd
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Abstract

The invention discloses a special colour simulation method. The method comprises the following steps of: S1, defining a printing technology, and detailing processing conditions; S2, manufacturing a test plate comprising whole or part of dot proportions according to the printing technology and the processing conditions in the step S1; S3, printing a testing colour by the test plate manufactured in the step S2 and according to the processing conditions in the step S1; and S4, testing on-site L*, a*, b* values of the testing colour and L*, a*, b* values of each characteristic point of the testing colour, and simulating L*, a*, b* values of each dot proportion of a new colour by virtue of the L*, a*, b* values of each characteristic point of the testing colour. The special colour simulating method provided by the invention has the advantage of simulation accuracy.

Description

A kind of method of spot color simulation
Technical field
The invention belongs to printing technology, relate to the spot color simulation of the front digital sample printing of seal.
Background technology
For reaching the purpose of " What You See Is What You Get ", before printing, need to adopt software to be presented at computer display screen making complete e-file for printing; Many times, need to use the ink jet printer of specialty, the print paper of specialty, this electronic paper printer out, i.e. digital sample printing is confirmed for the client, and as contract appendix to check and accept final printed matter.
So " digital sample printing=pull " is exactly the target of making great efforts before the printing, for realizing this goal, each color is simulated accurately just incomparably important.
Fairly simple for the product that all is color lump on the spot, the L* of each color lump of needs test, a*, the b* value equates just can prove its solid colour.But the prepress file for the overwhelming majority all comprises the site, and how simulating these is not that on the spot field color just becomes very difficult.
Summary of the invention
For this reason, technical problem to be solved by this invention provides a kind of method of spot color simulation, the deficiency that exists to overcome prior art.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of method of spot color simulation is characterized in that, comprises the steps:
S1, clear and definite typography, and process for refining condition;
S2, make the beta version that comprises all or part of site ratio according to the typography of step S1 and process conditions;
S3, the beta version that uses step S2 to make are according to a test of the process conditions printing color of step S1;
S4, test out the L* on the spot of this test color, a*, the L* of b* value and each characteristic point, a*, b* value;
S5, at L*, a*, in the b* model ball, calibrate the test color the P of point on the spot ExaminationWith each characteristic point Q Examination i, calculate each characteristic point and line ratio ξ on the spot i: and the angle ratio lambda i:
Figure BDA00002758626000021
Wherein, i is sequence number; l Examination iI characteristic point Q for the test color Examination iLine length to model ball's dead center O; L ExaminationThe P of point on the spot for the test color ExaminationLine length to model ball's dead center O; β Examination iBe line Q Examination iThe angle of O and L axle; α ExaminationBe line P Examination0 with the angle of L axle;
S6, choose a new color, test its L* on the spot, a*, b* value, and at L*, a* calibrates the P of point on the spot of this new color in the b* model ball NewlyAnd by putting P on the spot NewlyWith the position Q that calculates each characteristic point of color that makes new advances in the definite plane of L axle by following formula New i:
l New i=L Newly* ξ i, β Examination i=α Newly* λ i
Wherein, l New iI characteristic point Q for new color New iLine length to model ball's dead center O; L NewlyThe P of point on the spot for new color NewlyLine length to model ball's dead center O; β New iBe line Q New iThe angle of O and L axle; α NewlyBe line P Newly0 with the angle of L axle;
S7, at L*, a* is in the b* model ball, with the P of point on the spot of new color NewlyWith each characteristic point Q New iConnect continuously smooth curve, the D coordinates value of any point in the model ball is exactly the L* of the corresponding site of the new color ratio that simulates on the curve like this, a*, b* value.
For realizing directly obtaining the effect of digital sample printing, also include the step that the logarithmic code printer is proofreaied and correct in the method for described spot color simulation, so that the test solid colour of draw a design color and step S4 printing that digital-code printer prints; And behind described step S7, increase the step of new color being carried out digital sample printing with digital-code printer.
The described typography of described step S1 is the combined printing of a kind of or above-mentioned two or more mode of printings in offset printing, gravure, flexo, protruding seal, silk-screen, the digital printing; The process for refining condition comprises the selection of printing machine, the selection of forme technique, the selection of ink technique, the selection of relevant subsidiary conditions (as: anilox roll, double faced adhesive tape etc.), setting of print speed printing speed etc. among the described step S1.
Adopt technique scheme, the method for spot color simulation of the present invention has accurately advantage of analog color.
Description of drawings
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the P of point on the spot for the test color ExaminationWith each characteristic point Q Examination iAt L *, a *, b *Schematic diagram in the model ball;
Fig. 2 puts P on the spot for new color NewlyWith each characteristic point Q New iAt L *, a *, b *Schematic diagram in the model ball.
The specific embodiment
In order to understand clearly the present invention, be further described below by a detailed embodiment:
1, clear and definite typography, and process for refining condition;
Select satellite-type wide cut flexographic printing technique, and determine concrete printing condition:
Use the flexible printing machine of FPLUS2510 satellite-type of comexi brand, the FAH114D forme of Flint, sinwa company carries out laser plate-making, 37.5 ° of forme 110L/inch round dot screening, screen angles, use the thickness of 52021 trades mark of tesa company to be the neutral hardness double faced adhesive tape of 0.5mm version, adopt the FLX series alcohol-soluble printing ink of Hang Hua printing ink, printing ink reducer uses ethanol: propylene-glycol ethyl ether=4:1, printing viscosity 22s, use the 315(l/cm of apex) anilox roll, print speed printing speed 300m/min, stock are milky white PE-LD film;
2, make test forme e-file, select 100%, 95%, 90%, 85%, 80%, 75%, 70%, 60%, 50%, 40%, 30%, 25%, 20%, 15%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1% is characteristic point; Typography and process conditions according to step S1 are made the beta version that comprises all or part of site ratio,
3, the beta version that uses step S2 to make is according to a test of the process conditions printing color of step S1.
4, with the Spectroeye light splitting Density Measuring Instrument device scan printed matter of x-rite company, record the L* of the characteristic point of this test color, a*, b* value such as following table 1:
Table 1: the value L of the site of each characteristic point of test color *, a *, b *Value
Figure BDA00002758626000031
Figure BDA00002758626000041
5, use 7910 digital-code printers of Epson and this digital-code printer proofreaied and correct, so that the test solid colour that draw a design color and step S4 that digital-code printer prints print;
For example, with this digital-code printer the e-file of step 2 is carried out digital sample printing, test the L* of its each characteristic point, a*, b* value such as following table 2:
Table 2: the L of each characteristic point of the digital sample printing of test color *, a *, b *Value
The site L * a * b *
100% 57.24 70.82 -8.93
95% 58.81 68.11 -9.45
90% 60.17 65.67 -9.87
85% 61.65 62.96 -10.01
80% 62.90 61.14 -10.22
75% 64.67 59.79 -10.17
70% 65.93 55.29 -10.08
60% 69.70 48.68 -9.41
50% 73.73 41.99 -8.67
40% 78.29 34.26 -6.30
30% 82.73 26.85 -3.50
25% 85.20 23.01 -2.79
20% 87.30 19.48 -1.88
15% 90.04 15.30 -2.32
10% 92.63 11.26 -2.13
9% 93.32 10.10 -1.20
8% 93.82 9.40 -0.67
7% 94.37 8.57 -0.56
6% 95.02 7.69 -0.43
5% 95.37 7.14 -0.32
4% 96.10 6.18 -0.14
3% 96.73 5.22 -0.05
2% 97.55 3.86 0.23
1% 98.09 3.16 0.27
Whether the △ Ecmc of each characteristic point of check digital sample printing and printed matter is all in 2.5, as shown in table 3 below; As exceed 2.5 point, need the artificial L* that is input in the computer, a*, the b* value adjusted.
Table 3: the printed matter of each characteristic point of test color and the aberration of digital sample printing
The site △Ecmc
100% 1.82
95% 1.66
90% 1.73
85% 2.07
80% 2.00
75% 2.40
70% 2.19
60% 2.36
50% 2.39
40% 2.22
30% 1.97
25% 2.46
20% 2.42
15% 1.80
10% 2.47
9% 2.46
8% 2.10
7% 2.19
6% 2.09
5% 2.04
4% 2.23
3% 2.42
2% 2.22
1% 2.44
6), as shown in Figure 1, at L*, a* in the b* model ball, calibrates the P of point on the spot of test color ExaminationWith each characteristic point Q Examination iEach characteristic point Q in theory Examination iShould be positioned at by putting P on the spot ExaminationIn the definite plane of L axle, but since printing error, these each characteristic points Q Examination iIn some can deviation point P ExaminationWith the plane that the L axle is determined, be haply in a plane still, so can calculate each characteristic point and line ratio ξ on the spot i: and the angle ratio lambda i:
Figure BDA00002758626000051
Figure BDA00002758626000052
Wherein, i is sequence number; l Examination iI characteristic point Q for the test color Examination iLine length to model ball's dead center O; L ExaminationThe P of point on the spot for the test color ExaminationLine length to model ball's dead center O; β Examination iBe line Q Examination iThe angle of O and L axle; α ExaminationBe line P Examination0 with the angle of L axle;
7), choose a new color, it is color L*=62.71 on the spot, a*=-39.34, b*=-48.20, and at L*, a* calibrates the P of point on the spot of this new color in the b* model ball Newly(as shown in Figure 2); And by putting P on the spot NewlyWith the position Q that calculates each characteristic point of color that makes new advances in the definite plane of L axle by following formula New i:
l New i=L Newly* ξ i, β Examination i=α Newly* λ i
Wherein, l New iI characteristic point Q for new color New iLine length to model ball's dead center O; L NewlyThe P of point on the spot for new color NewlyLine length to model ball's dead center O; β New iBe line Q New iThe angle of O and L axle; α NewlyBe line P Newly0 with the angle of L axle;
8), at L*, a* is in the b* model ball, with the P of point on the spot of new color NewlyWith each characteristic point Q New iConnect continuously smooth curve, the D coordinates value of any point in the model ball is exactly the L* of the corresponding site of the new color ratio that simulates on the curve like this, a*, b* value; Such as following table 4.
Table 4, the L of each site ratio of new color *, a *, b *Value
The site L * a * b *
100% 62.71 -39.34 -48.20
95% 62.24 -39.72 -49.05
90% 63.31 -38.92 -47.62
85% 64.99 -38.11 -46.09
80% 66.46 -36.47 -44.32
75% 66.58 -35.47 -43.80
70% 68.15 -33.69 -41.65
60% 72.19 -27.91 -35.56
50% 76.31 -23.78 -30.38
40% 78.16 -20.87 -27.92
30% 81.65 -17.47 -22.87
25% 84.16 -15.49 -19.82
20% 85.92 -13.75 -17.68
15% 89.07 -10.88 -13.53
10% 91.80 -9.05 -10.28
9% 92.26 -8.50 -9.52
8% 92.78 -8.05 -8.72
7% 92.62 -7.40 -8.47
6% 92.88 -6.96 -7.94
5% 93.31 -6.56 -7.51
4% 93.94 -5.76 -6.37
3% 94.93 -5.28 -5.39
2% 96.08 -4.38 -3.80
1% 97.29 -3.86 -2.74
9), with the digital-code printer in the step 5) new color is carried out digital sample printing at last.
Check
Use new color again to print according to typography and the printing condition of step 1), test the L* of its each characteristic point, a*, b*, such as following table 5:
Table 5, the L of new each characteristic point of color printing product *, a *, b *Value
Figure BDA00002758626000071
According to the theoretical L that calculates of each characteristic point *, a *, b *The L of value and printing *, a *, b *Value is calculated, and aberration △ Ecmc sees Table 6.The result shows that the △ Ecmc of each characteristic point of printed matter is all smaller, requirement (△ Ecmc≤2.5 near △ Ecmc≤2.5, people's eyes have been difficult to distinguish aberration), wherein 13 characteristic point △ E are in 2.5, the △ Ecmc of 10 characteristic points only has the △ Ecmc of 1 characteristic point greater than 3 between 2.5～3, be 3.25, analyze its reason and may be (the △ Ecmc=1.30 from 100% can be proven) due to the aberration of the stylish color toning of printing.The calculating of △ Ecmc, adopted (the SDC of association of Britain dyeing man, the Society of Dyers and Colourist) (CMC of the color measuring committee, the Society ' s Color Measurement Committee) CMC (l:c) colour difference formula of recommending, l:c in this case adopts printing industry 2:1 commonly used.
The calculating aberration of new each the characteristic point printed matter of color of table 6 and theoretical value
Figure BDA00002758626000081
Can find out that by check spot color analogy method of the present invention has simulates accurately advantage.
But; those skilled in the art will recognize that; the above-mentioned specific embodiment is exemplary; in order better to make those skilled in the art can understand the application; can not be interpreted as it is restriction to the application's protection domain; change or modify so long as disclose spiritual any being equal to of doing according to the application, all fall into the scope of the application's protection.

Claims (3)

1. the method for a spot color simulation is characterized in that, comprises the steps:
S1, clear and definite typography, and process for refining condition;
S2, make the beta version that comprises all or part of site ratio according to the typography of step S1 and process conditions;
S3, the beta version that uses step S2 to make are according to a test of the process conditions printing color of step S1;
S4, test out the L* on the spot of this test color, a*, the L* of b* value and each characteristic point, a*, b* value;
S5, at L*, a*, in the b* model ball, calibrate the test color the P of point on the spot ExaminationWith each characteristic point Q Examination i, calculate each characteristic point and line ratio ξ on the spot i: and the angle ratio lambda i:
Figure FDA00002758625900011
Figure FDA00002758625900012
Wherein, i is sequence number; l Examination iI characteristic point Q for the test color Examination iLine length to model ball's dead center O; L ExaminationThe P of point on the spot for the test color ExaminationLine length to model ball's dead center O; β Examination iBe line Q Examination iThe angle of O and L axle; α ExaminationBe line P Examination0 with the angle of L axle;
S6, choose a new color, test its L* on the spot, a*, b* value, and at L*, a* calibrates the P of point on the spot of this new color in the b* model ball NewlyAnd by putting P on the spot NewlyWith the position Q that calculates each characteristic point of color that makes new advances in the definite plane of L axle by following formula New i:
l New i=L Newly* ξ i, β Examination i=α Newly* λ i
Wherein, l New iI characteristic point Q for new color New iLine length to model ball's dead center O; L NewlyThe P of point on the spot for new color NewlyLine length to model ball's dead center O; β New iBe line Q New iThe angle of O and L axle; α NewlyBe line P Newly0 with the angle of L axle;
S7, at L*, a* is in the b* model ball, with the P of point on the spot of new color NewlyWith each characteristic point Q New iConnect continuously smooth curve, the D coordinates value of any point in the model ball is exactly the L* of the corresponding site of the new color ratio that simulates on the curve like this, a*, b* value.
2. the method for spot color according to claim 1 simulation, it is characterized in that: also include the step that the logarithmic code printer is proofreaied and correct in the method for described spot color simulation, so that the test solid colour of draw a design color and step S4 printing that digital-code printer prints; And behind described step S7, increase the step of new color being carried out digital sample printing with digital-code printer.
3. the method for spot color according to claim 1 simulation, it is characterized in that: the described typography of described step S1 is the combined printing of a kind of or above-mentioned two or more mode of printings in offset printing, gravure, flexo, protruding seal, silk-screen, the digital printing; The process for refining condition comprises the selection of printing machine, the selection of forme technique, the selection of ink technique, the selection of relevant subsidiary conditions, the setting of print speed printing speed among the described step S1.
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CN103747161A (en) * 2013-12-19 2014-04-23 杭州电子科技大学 High-fidelity spot color number hard proofing method
CN107345331A (en) * 2017-06-20 2017-11-14 浙江理工大学 The structure and its application process of digital jacquard woven fabric multiple bases subregion colour mixture model
CN116494645A (en) * 2022-01-25 2023-07-28 海德堡印刷机械股份公司 Method for adapting Lab nominal color values of multicolor printed products

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CN116494645A (en) * 2022-01-25 2023-07-28 海德堡印刷机械股份公司 Method for adapting Lab nominal color values of multicolor printed products

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