CN103042853B - Special colour simulation method - Google Patents

Special colour simulation method Download PDF

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CN103042853B
CN103042853B CN201310021698.0A CN201310021698A CN103042853B CN 103042853 B CN103042853 B CN 103042853B CN 201310021698 A CN201310021698 A CN 201310021698A CN 103042853 B CN103042853 B CN 103042853B
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color
new
spot
examination
newly
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CN103042853A (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 digital sample printing before printing.
Background technology
For reaching the object of " What You See Is What You Get ", before printing, need to completely for the e-file printing, adopt software to be presented at computer display screen making; Many times, need to use the print paper of professional ink jet printer, specialty, this electronic paper printer out, i.e. digital sample printing, confirms for 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 printing, for realizing this goal, each color is simulated accurately just incomparably important.
Fairly simple for the product that is all color lump on the spot, only need to test the L* of each color lump, a*, b* value is equal just can prove its solid colour.But for most prepress files, all comprise site, how simulating these is not that field color on the spot just becomes very difficult.
Summary of the invention
For this reason, technical problem to be solved by this invention is to provide a kind of method of spot color simulation, the deficiency existing to overcome prior art.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A method for spot color simulation, is characterized in that, comprises the steps:
S1, clear and definite typography, and process for refining condition;
S2, the beta version that comprises all or part of site ratio according to the typography of step S1 and process conditions making;
S3, the beta version that uses step S2 to make, according to test color of the process conditions printing 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 b* model ball, calibrate 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 angle ratio lambda i:
Wherein, i is sequence number; l examination ii the characteristic point Q for test color examination iline length to model ball's dead center O; L examinationthe P of point on the spot for test color examinationline length to model ball's dead center O; β examination ifor line Q examination ithe angle of O and L axle; α examinationfor 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 b* model ball newly; And by putting P on the spot newlywith in the definite plane of L axle, by following formula, calculate the position Q of each characteristic point of color that makes new advances new i:
L new i=L newly* ξ i, β new i=α newly* λ i
Wherein, l new ii the 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 ifor line Q new ithe angle of O and L axle; α newlyfor line P newly0 with the angle of L axle;
S7, at L*, a*, in b* model ball, with the P of point on the spot of new color newlywith each characteristic point Q new iconnect continuously smooth curve, on curve, the D coordinates value of any point in model ball is exactly the L* of the corresponding site of the new color ratio that simulates like this, a*, b* value.
For realizing the effect of direct acquisition digital sample printing, in the method for described spot color simulation, also include the step that logarithmic code printer is proofreaied and correct, the test solid colour that draw a design color and the step S4 that makes that digital-code printer prints prints; And increase and with digital-code printer, new color is carried out the step of digital sample printing after described step S7.
Typography described in 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, digital printing; In described step S1, process for refining condition comprises selection, the selection of forme technique, the selection of the selection of ink technique, relevant subsidiary conditions (as: anilox roll, double faced adhesive tape etc.) of printing machine, setting of print speed printing speed etc.
Adopt technique scheme, the method for spot color simulation of the present invention has analog color advantage accurately.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Fig. 1 is the P of point on the spot for test color examinationwith each characteristic point Q examination iat L *, a *, b *schematic diagram in 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 model ball.
The specific embodiment
In order to understand clearly the present invention, below by a detailed embodiment, be further described:
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, the thickness that uses 52021 trades mark of tesa company is the neutral hardness double faced adhesive tape of 0.5mm version, adopt the FLX series alcohol-soluble printing ink of Hang Hua ink, printing ink reducer is used ethanol: propylene-glycol ethyl ether=4:1, printing viscosity 22s, use 315 (l/cm) anilox roll of apex, print speed printing speed 300m/min, stock is 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; According to the typography of step S1 and process conditions, make the beta version that comprises all or part of site ratio,
3, the beta version that uses step S2 to make, according to test color of the process conditions printing 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 is as following table 1:
Table 1: the value L of the site of each characteristic point of test color *, a *, b *value
5, use 7910 digital-code printers of Epson and this digital-code printer is proofreaied and correct, the test solid colour that draw a design color and the step S4 that makes that digital-code printer prints prints;
For example, with this digital-code printer, the e-file of step 2 is carried out to digital sample printing, test the L* of its each characteristic point, a*, b* value is as following table 2:
Table 2: the L of each characteristic point of the digital sample printing of test color *, a *, b *value
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 artificial adjustment to be input to the L* in computer, a*, b* value.
Table 3: the printed matter of each characteristic point of test color and the aberration of digital sample printing
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 b* model ball, calibrates the P of point on the spot of test color examinationwith each characteristic point Q examination i.Each characteristic point Q in theory examination ishould be positioned at by putting P on the spot examinationin the definite plane of L axle, but due to printing error, these each characteristic points Q examination iin some can deviation point P examinationthe plane definite with L axle, but be haply in a plane, therefore can calculate each characteristic point and line ratio ξ on the spot i: and angle ratio lambda i:
Wherein, i is sequence number; l examination ii the characteristic point Q for test color examination iline length to model ball's dead center O; L examinationthe P of point on the spot for test color examinationline length to model ball's dead center O; β examination ifor line Q examination ithe angle of O and L axle; α examinationfor 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 b* model ball newly(as shown in Figure 2); And by putting P on the spot newlywith in the definite plane of L axle, by following formula, calculate the position Q of each characteristic point of color that makes new advances new i:
L new i=L newly* ξ i, β new i=α newly* λ i
Wherein, l new ii the 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 ifor line Q new ithe angle of O and L axle; α newlyfor line P newly0 with the angle of L axle;
8), at L*, a*, in b* model ball, with the P of point on the spot of new color newlywith each characteristic point Q new iconnect continuously smooth curve, on curve, the D coordinates value of any point in model ball is exactly the L* of the corresponding site of the new color ratio that simulates like this, a*, b* value; As following table 4.
Table 4, the L of each site ratio of new color *, a *, b *value
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), finally use step 5) in digital-code printer new color is carried out to digital sample printing.
Check
Use new color according to step 1) typography and printing condition again print, test the L* of its each characteristic point, a*, b*, as following table 5:
Table 5, the L of new each characteristic point of color printing product *, a *, b *value
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, in Table 6.Result shows that the △ Ecmc of each characteristic point of printed matter is all smaller, approach requirement (△ Ecmc≤2.5 of △ 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, between 2.5～3, only has the △ Ecmc of 1 characteristic point to be greater than 3, is 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 the conventional 2:1 of printing industry.
The calculating aberration of new each characteristic point printed matter of color of table 6 and theoretical value
By check, can find out, spot color analogy method of the present invention has simulates advantage accurately.
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 the restriction to the application's protection domain; so long as disclose spiritual do any according to the application, be equal to change or modify, all falling into the scope of the application's protection.

Claims (3)

1. a method for spot color simulation, is characterized in that, comprises the steps:
S1, clear and definite typography, and process for refining condition;
S2, the beta version that comprises all or part of site ratio according to the typography of step S1 and process conditions making;
S3, the beta version that uses step S2 to make, according to test color of the process conditions printing 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 b* model ball, calibrate 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 angle ratio lambda i:
Wherein, i is sequence number; l examination ii the characteristic point Q for test color examination iline length to model ball's dead center O; L examinationthe P of point on the spot for test color examinationline length to model ball's dead center O; β examination ifor line Q examination ithe angle of O and L axle; α examinationfor 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 b* model ball newly; And by putting P on the spot newlywith in the definite plane of L axle, by following formula, calculate the position Q of each characteristic point of color that makes new advances new i:
L new i=L newly* ξ i, β new i=α newly* λ i
Wherein, l new ii the 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 ifor line Q new ithe angle of O and L axle; α newlyfor line P newly0 with the angle of L axle;
S7, at L*, a*, in b* model ball, with the P of point on the spot of new color newlywith each characteristic point Q new iconnect continuously smooth curve, on curve, the D coordinates value of any point in model ball is exactly the L* of the corresponding site of the new color ratio that simulates like this, a*, b* value.
2. the method that spot color according to claim 1 is simulated, it is characterized in that: in the method for described spot color simulation, also include the step that logarithmic code printer is proofreaied and correct, the test solid colour that draw a design color and the step S4 that makes that digital-code printer prints prints; And increase and with digital-code printer, new color is carried out the step of digital sample printing after described step S7.
3. the method for spot color simulation according to claim 1, is characterized in that: the typography described in 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, digital printing; In described step S1, process for refining condition comprises selection, the selection of forme technique, the selection of the selection of ink technique, relevant subsidiary conditions of printing machine, the setting of print speed printing speed.
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CN103747161B (en) * 2013-12-19 2016-04-27 杭州电子科技大学 The hard proofing method of a kind of high-fidelity spot color numeral
CN107345331B (en) * 2017-06-20 2019-06-21 浙江理工大学 The building of digital jacquard woven fabric multiple bases subregion colour mixture model and its application method
DE102022101631B3 (en) * 2022-01-25 2023-01-05 Heidelberger Druckmaschinen Aktiengesellschaft Process for adjusting a Lab target color value of multicolored printed products

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