CN103895375A - Method for lithographic plate offset print chrominance control and method for lithographic plate offset print - Google Patents
Method for lithographic plate offset print chrominance control and method for lithographic plate offset print Download PDFInfo
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- CN103895375A CN103895375A CN201410075881.3A CN201410075881A CN103895375A CN 103895375 A CN103895375 A CN 103895375A CN 201410075881 A CN201410075881 A CN 201410075881A CN 103895375 A CN103895375 A CN 103895375A
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000007639 printing Methods 0.000 claims abstract description 68
- 238000012937 correction Methods 0.000 claims abstract description 17
- 238000001459 lithography Methods 0.000 claims description 38
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 10
- 239000010931 gold Substances 0.000 claims description 10
- 229910052737 gold Inorganic materials 0.000 claims description 10
- 244000025254 Cannabis sativa Species 0.000 claims description 9
- 239000003086 colorant Substances 0.000 claims description 6
- 238000003908 quality control method Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 3
- 239000000976 ink Substances 0.000 description 35
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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Abstract
The invention provides a method for lithographic plate offset print chrominance control. The method comprises the following steps that a first chrominance value Lab1 of a first type of paper and a first printing chrominance value Lab2 of first printing ink on the first type of paper are obtained; a second chrominance value Lab3 of a second type of paper is measured; according to the first chrominance value Lab1, the second chrominance value Lab3 and the first printing chrominance value Lab2, a theoretical printing chrominance value Lab4 of the first printing ink on the second type of paper is obtained through calculation; actual printing is conducted under the guidance of the theoretical printing chrominance value Lab4, color correction is conducted in the printing process. The invention further discloses a method for lithographic plate offset print, wherein the method for lithographic plate offset print comprises the method for lithographic plate offset print chrominance control. Through the method for lithographic plate offset print chrominance control, the print chrominance value on the second type of paper appointed by a client is rapidly controlled according to commonly-used paper and ink, and therefore an object with the chrominance value satisfying the standard is rapidly printed.
Description
Technical field
The present invention relates to print field, relate in particular to offset lithography colourity control method and offset lithography method.
Background technology
The ink field density that before comparing, lithographic printing quality control adopts, generally adopt in the world at present the chromatic value of ink on the spot as the control index of printing quality, but, paper and the ink type of offset lithography are various, the combination of every kind of paper, ink and printing equipment, have its certain color range that is, and colourity do not have direct relation with China ink amount on the spot, so be difficult to determine the best chromatic value on the spot of printing.Although aborning just like providing colourity desired value on the spot in ISO12647-2 standard, but need to just can reach desired value with standard compliant ink and paper, but the paper using in actual production and ink are varied, not necessarily can meet standard, so how find for the best of the combination of different ink and paper on the spot the method for chromatic value be the difficult problem of present stage.
The general practice is before formal printing now, for used paper with ink is drawn a design or repeatedly test with printability instrument, to find the most stable color, measure data, instruct and control actual print by these data, this practice consumes more human and material resources and time.Specifically, in technical merit, the limited small-print enterprise of human and material resources, be difficult to adopt said method control chromatic value on the spot, can only rely on printing master worker's experience to carry out color correction, be difficult to guarantee printing quality; For large enterprise, when delivery date very in short-term, be also difficult to adopt said method control chromatic value on the spot.
Summary of the invention
In view of the above, be necessary to provide a kind of quick control to print offset lithography colourity control method and the offset lithography method of chromatic value on the spot.
A kind of offset lithography colourity control method, it comprises the following steps:
S11: the first colourity Lab1 and the first printing chromatic value Lab2 of ink first on described the first paper that obtain the first paper;
S12: the second colourity Lab3 that measures the second paper;
S13: calculate the theory printing chromatic value Lab4 of described ink first on described the second paper according to described the first colourity Lab1, described the second colourity Lab3 and described the first printing chromatic value Lab2;
S14: instruct and carry out actual print according to above-mentioned theory printing chromatic value Lab4, carry out color correction in printing process.
Further, in step S14, carry out color correction according to the colourity of described the second paper.
Further, in color correction process, whether there is colour cast according to the grey balance color lump inspection on printing quality control strip.
Further, in the time carrying out color correction according to grey balance color lump,, if grey balance color lump has colour cast, adjust process color, make grey balance color lump grey.
Further, the first printing chromatic value Lab2 of described ink first on described the first paper is for obtaining in advance.
Further, in the process of described step S13, comprising:
(a) calculate tristimulus values X1, Y1, Z1 according to the first colourity Lab1 of the first paper, the chromatic value Lab2(Y of the color lump on the spot of Huang according to described ink first on described the first paper, product, green grass or young crops, black four kinds of colors), Lab2(M), Lab2(C), Lab2(K) calculate respectively yellow tristimulus values X2(Y), Y2(Y), Z2(Y); Product look tristimulus values X2(M), Y2(M); Z2(M); Cyan tristimulus values X2(C), Y2(C), Z2(C); Black tristimulus values X2(K), Y2(K), Z2(K).Utilize reduction formula to calculate tristimulus values X3, Y3, Z3 according to the second colourity Lab3 of the second paper;
(b) calculate X4(Y according to following computing function), X4(M), X4(C), X4(K):
X4（Y）=X2（Y）*（X3/X1），
X4（M）=X2（M）*（X3/X1），
X4（C）=X2（C）*（X3/X1），
X4（K）=X2（K）*（X3/X1），
In like manner obtain Y4(Y), Y4(M), Y4(C), Y4(K) and Z4(Y), Z4(M), Z4(C), Z4(K);
(c) calculate the chromatic value Lab4(Y of the color lump on the spot of the Huang of ink first on the second paper, product, green grass or young crops, black four kinds of colors according to XYZ4), Lab4(M), Lab4(C), Lab4(K), i.e. Lab4.
Further, described the first paper is that colourity is Lab (95.5,0.45,0.48), printing chromatic value described in described ink first on the first paper is Lab(Y93 ,-7.57,94.97), (M47.8,79.17,-5.30), (C58.5 ,-43.3 ,-48.3), (K13.14,1.27,3.25).。
Further, described the second paper is 100g/m
2the two art printing papers in gold east, described the second colourity Lab3 is Lab (92.56,0.2875 ,-4.264); Described ink first is at 100g/m
2printing chromatic value on the two art printing papers in gold east will be Lab(Y90.13 ,-7.52,90.17), (M46.12,76.97 ,-8.01), (C56.54 ,-42.25 ,-51.39), (K12.37,1.20,2.00).
Further, in the process of color correction, the blueness of partially blue grey balance color lump is lowered until grey balance color lump gray.
The present invention also provides a kind of offset lithography method, and it comprises above-mentioned offset lithography colourity control method.
Further, described offset lithography method is further comprising the steps of: after adopting above-mentioned offset lithography colourity control method to mix up chromatic value, try printing, whether the chromatic value of check examination printing meets the requirements, if chromatic value meets the requirements, formally prints.
With respect to prior art, by above-mentioned offset lithography colourity control method, can be controlled at rapidly the printing chromatic value on the second paper of specifying client according to conventional at ordinary times paper and ink, go out standard compliant chromatic value thereby realize quick print.
Accompanying drawing explanation
Fig. 1 is the flow chart of offset lithography colourity control method of the present invention.
The specific embodiment
By describing technology contents of the present invention, structural feature in detail, being realized object and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
The present invention discloses a kind of offset lithography colourity control method, it should be noted that, and the paper that common customer only specifies printshop to use, and do not specify ink type, described offset lithography colourity control method proposes for this situation.Refer to Fig. 1, described offset lithography colourity control method is with comprising the following steps:
S11: the first colourity Lab1 and the first printing chromatic value Lab2 of ink first (the ink called after by a kind of predetermined employing: ink first) on described the first paper that obtain the first paper; Particularly, described the first printing chromatic value Lab2 is Huang, product, green grass or young crops, the black on the spot chromatic value Lab2(Y of color lump of described ink first on described the first paper), Lab2(M), Lab2(C), Lab2(K);
S12: the second colourity Lab3 that measures the second paper;
S13: calculate the theory printing chromatic value Lab4 of described ink first on described the second paper according to described the first colourity Lab1, described the second colourity Lab3 and described the first printing chromatic value Lab2; Particularly, calculate the theory printing chromatic value Lab4 of the second paper through function, described theoretical printing chromatic value Lab4 is Huang, product, green grass or young crops, the black on the spot chromatic value Lab4(Y of color lump of described ink first on described the second paper), Lab4(M), Lab4(C), Lab4(K);
The process of utilizing above-mentioned function to calculate the theory printing chromatic value Lab4 of the second paper is:
1, calculate tristimulus values X1, Y1, Z1 according to the first colourity Lab1 of the first paper, the chromatic value Lab2(Y of the color lump on the spot of Huang according to described ink first on described the first paper, product, green grass or young crops, black four kinds of colors), Lab2(M), Lab2(C), Lab2(K) calculate respectively yellow tristimulus values X2(Y), Y2(Y), Z2(Y); Product look tristimulus values X2(M), Y2(M), Z2(M); Cyan tristimulus values X2(C), Y2(C), Z2(C); Black tristimulus values X2(K), Y2(K), Z2(K).Utilize reduction formula to calculate tristimulus values X3, Y3, Z3 according to the second colourity Lab3 of the second paper;
2, calculate X4(Y according to following computing function), X4(M), X4(C), X4(K):
X4（Y）=X2（Y）*（X3/X1），
X4（M）=X2（M）*（X3/X1），
X4（C）=X2（C）*（X3/X1），
X4（K）=X2（K）*（X3/X1），
In like manner obtain Y4(M), Y4(C), Y4(Y), Y4(K) and Z4(M), Z4(C), Z4(Y), Z4(K);
3, calculate the chromatic value Lab4(Y of the color lump on the spot of the product of ink first on the second paper, green grass or young crops, Huang, black four kinds of colors according to XYZ4), Lab4(M), Lab4(C), Lab4(K), i.e. Lab4.
S14: instruct and carry out actual print according to above-mentioned theory printing chromatic value Lab4, carry out color correction in printing process.
Further, in step S14, carry out color correction according to the colourity of described the second paper.
Further, in color correction process, according to whether colour cast of the inspection grey balance color lump on printing quality control strip.
Further, in the time carrying out color correction according to grey balance color lump, if grey balance color lump has colour cast, adjust process color, make grey balance color lump grey.
In above-mentioned offset lithography colourity control method, described the first paper is the paper that printing enterprise commonly uses at ordinary times, the first printing chromatic value Lab2 of ink first on described the first paper is standard compliant chromatic value, its can be by ordinary times experiment or former actual print data acquisition, described the second paper is the paper that current client specifies.By above-mentioned offset lithography colourity control method, can be controlled at rapidly the printing chromatic value on the second paper that client specifies according to conventional at ordinary times paper and ink, go out standard compliant chromatic value thereby realize quick print.
Below take a concrete printing example as example illustrates above-mentioned offset lithography colourity control method.
Customer requirement 100g/m
2the two art printing papers in gold east, ink be exactly with enterprise always at the Tianjin of use Japan offset ink, the chromatic value on certain paper that the former seal of known Tianjin Japan's offset ink is crossed and the colourity of this paper, utilize above-mentioned offset lithography colourity control method to be:
1. the colourity Lab (95.5 of certain paper printing before measuring, 0.45,0.48), and the printing chromatic value Lab(Y93 of ink on this paper,-7.57,94.97), (M47.8,79.17 ,-5.30), (C58.5,-43.3,-48.3), (K13.14,1.27,3.25);
2. record 100g/m
2the two art printing paper colourity Lab (92.56,0.2875 ,-4.264) in gold east;
3. obtain as calculated ink at 100g/m
2the printing chromatic value of the two art printing papers in gold east will be Lab(Y90.13 ,-7.52,90.17), (M46.12,76.97 ,-8.01), (C56.54 ,-42.25 ,-51.39), (K12.37,1.20,2.00).；
According to the Tianjin ink of gained at 100g/m
2huang, product, green grass or young crops, the black chromatic value Lab(Y90.13 of color lump on the spot of the two art printing papers in gold east ,-7.52,90.17), (M46.12,76.97 ,-8.01), (C56.54 ,-42.25 ,-51.39), (K12.37,1.20,2.00).The colourity control of the look on the spot of data-guiding actual print;
5. from 100g/m
2the paper look of the two art printing papers in gold east obviously can find out that this paper is partially blue in data really, after second step color correction, picture entirety may be for partially blue, specifically can check the grey balance color lump in printing quality signal testing bar, if grey balance color lump is partially blue, blueness is lowered a little, entirety only need be finely tuned to grey balance color lump gray, and whole color correction process finishes.
Find with Tianjin ink at 100g/m through above-mentioned example
2printing chromatic value on the two powder in gold east meets the requirements of the standard.
The present invention also discloses a kind of offset lithography method, and it adopts above-mentioned offset lithography colourity control method.More specifically, described offset lithography method is further comprising the steps of: after adopting above-mentioned offset lithography colourity control method to mix up chromatic value, try printing, whether the chromatic value of check examination printing meets the requirements, if chromatic value meets the requirements, formally prints.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure transformation that utilizes description of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an offset lithography colourity control method, it comprises the following steps:
S11: the first colourity Lab1 and the first printing chromatic value Lab2 of ink first on described the first paper that obtain the first paper;
S12: the second colourity Lab3 that measures the second paper;
S13: calculate the theory printing chromatic value Lab4 of described ink first on described the second paper according to described the first colourity Lab1, described the second colourity Lab3 and described the first printing chromatic value Lab2;
S14: instruct and carry out actual print according to above-mentioned theory printing chromatic value Lab4, carry out color correction in printing process.
2. offset lithography colourity control method according to claim 1, is characterized in that: in step S14, carry out color correction according to the colourity of described the second paper.
3. offset lithography colourity control method according to claim 1, is characterized in that: in color correction process, whether have colour cast according to the grey balance color lump inspection on printing quality control strip.
4. offset lithography colourity control method according to claim 3, is characterized in that: in the time carrying out color correction according to grey balance color lump, if grey balance color lump has colour cast, adjust process color, make grey balance color lump grey.
5. offset lithography colourity control method according to claim 1, is characterized in that: the first printing chromatic value Lab2 of described ink first on described the first paper is for obtaining in advance.
6. offset lithography colourity control method according to claim 1, is characterized in that: in the process of described step S13, comprising:
(a) calculate tristimulus values X1, Y1, Z1 according to the first colourity Lab1 of the first paper, the chromatic value Lab2(Y of the color lump on the spot of Huang according to described ink first on described the first paper, product, green grass or young crops, black four kinds of colors), Lab2(M), Lab2(C), Lab2(K) calculate respectively yellow tristimulus values X2(Y), Y2(Y), Z2(Y); Product look tristimulus values X2(M), Y2(M), Z2(M); Cyan tristimulus values X2(C), Y2(C), Z2(C); Black tristimulus values X2(K), Y2(K), Z2(K), utilize reduction formula to calculate tristimulus values X3, Y3, Z3 according to the second colourity Lab3 of the second paper;
(b) calculate X4(Y according to following computing function), X4(M), X4(C), X4(K):
X4（Y）=X2（Y）*（X3/X1），
X4（M）=X2（M）*（X3/X1），
X4（C）=X2（C）*（X3/X1），
X4（K）=X2（K）*（X3/X1），
In like manner obtain Y4(Y), Y4(M), Y4(C), Y4(K) and Z4(Y), Z4(M), Z4(C), Z4(K);
(c) calculate the chromatic value Lab4(Y of the color lump on the spot of the Huang of ink first on the second paper, product, green grass or young crops, black four kinds of colors according to XYZ4), Lab4(M), Lab4(C), Lab4(K), i.e. Lab4.
7. offset lithography colourity control method according to claim 1, is characterized in that: described the first paper is that colourity is Lab (95.5,0.45,0.48), printing chromatic value described in described ink first on the first paper is Lab(Y93 ,-7.57,94.97), (M47.8,79.17,-5.30), (C58.5 ,-43.3 ,-48.3), (K13.14,1.27,3.25).
8. offset lithography colourity control method according to claim 7, is characterized in that: described the second paper is 100g/m
2the two art printing papers in gold east, described the second colourity Lab3 is Lab (92.56,0.2875 ,-4.264); Described ink first is at 100g/m
2printing chromatic value on the two art printing papers in gold east will be Lab(Y90.13 ,-7.52,90.17), (M46.12,76.97 ,-8.01), (C56.54 ,-42.25 ,-51.39), (K12.37,1.20,2.00).
9. an offset lithography method, is characterized in that: comprise according to the offset lithography colourity control method described in any one in claim 1-8.
10. offset lithography colourity control method according to claim 9, it is characterized in that: described offset lithography method is further comprising the steps of: after adopting above-mentioned offset lithography colourity control method to mix up chromatic value, try printing, whether the chromatic value of check examination printing meets the requirements, if chromatic value meets the requirements, formally print.
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| CN103895375B (en) | 2017-03-15 |
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