CN106385524A - LAB chromatography manufacturing method and application - Google Patents
LAB chromatography manufacturing method and application Download PDFInfo
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- CN106385524A CN106385524A CN201610798716.XA CN201610798716A CN106385524A CN 106385524 A CN106385524 A CN 106385524A CN 201610798716 A CN201610798716 A CN 201610798716A CN 106385524 A CN106385524 A CN 106385524A
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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
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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
- H04N1/6005—Corrections within particular colour systems with luminance or chrominance signals, e.g. LC1C2, HSL or YUV
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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
- H04N1/6077—Colour balance, e.g. colour cast correction
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
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- Facsimile Image Signal Circuits (AREA)
Abstract
The present invention discloses a LAB chromatography manufacturing method. The manufacturing method comprises: the Lch coordinate system of a LAB color space color value is called, in the ch plane, from 0 to 360 degrees, each page is arranged at intervals of one fixed angle, the page numbers are decided according to a hue angle h, and the pages are arranged in order; in the ch plane of the Lch coordinate system, the hue angle h=arctg(b/a), the a shaft and the b shaft are the chrominance axes, the a axis is a red-green axis and has the data range of -28 to 127; the b axis is a yellow-blue axis and has the data range of -128 to 127; the color lump typesetting of each page is performed, in the color lump typesetting of each page, the values of the brightness axis L of the color lump colors in the value range are used for ordering, wherein the brightness axis L has the value range f 0 to 100; and the color gamuts in the page through the color lump colors are taken as the division basis for performing division arrangement. When the LAB chromatography manufacturing method and application are applied to the printing, the consistency of the colors as much as possible can be ensured only according to the printing standard.
Description
Technical field
The invention belongs to colored reproduction technology field；More particularly, to a kind of manufacture method of LAB chromatograph and purposes.
Background technology
Human lives, in the multicoloured world, experience the colourful colouring information of nature by visual organ,
Obtain the information in the external world by the color of perceptual object.Various different colors are passed on and are given people different information, bring not
Same emotion.
In colouring information digitized today, either multiple in information such as color television, colour phhotograpy or colored printings
System and communication sphere, various color copying methods are all intended to realize duplication and the transmission of colouring information after all.So, correctly
Ground understands rule and the feature of color, for correctly use color, exactly copy colors all it is critical that.
Chromatograph describes bright and colourful color in the Nature, and chromatograph is will be orderly according to certain rules for different colours color lump
The regular tinctorial pattern figure being formed after lining up.This is a kind of qualitative not only quantitative and but also directly perceived, straightaway color table
Show method.Also known as color table, color diagram, major part needs to control the use color rows producing and differentiating quality with color chromatograph
Industry, all application chromatograph, to represent color, is the color alignment table for color departments' reference at large.
When designing printed works, the not only collocation of the element such as image to be considered, word and lines, more to consider each
, it is necessary to whether color designed by considering can be printed and be realized, whether the color printing is accurate for the color coordination of element
Really, if consistent with the intention of design, satisfied effect can be reached.Different printing material, different printing method and condition, institute
The leaflet color obtaining also can difference, therefore, in design and printing product it is necessary to know the color effect printing
Really.Process color as the colored reference replicating industry color is composed and is seemed extremely important.Can be directly perceived using printing chromatograph
Color effects are seen on ground, for designing and making, print people finder's color and use, or are used for checking color.
It is most commonly that CMYK printing chromatograph at present, CMYK represents printing-ink green grass or young crops (C), pinkish red (M), yellow (Y), black respectively
(K) color.
Color in chromatograph presses the aligned transfer of the dot area combination of CMYK, using the value of CMYK dot area as color
Name.
In printing process, site is a basic printing element, and the color of image is by the size of site or density table
Existing, by the site mixing of CMYK tetra- color, then can show infinite many colors.Such as amplitude is that current printing makes
A kind of most commonly used site.In unit area, by adjusting the size of site come the depth of apparent color, site accounts for
The quantity of unit area is referred to as dot percentage.For example in FIG, have 0%, 10%, 20%, 30%, 40%, 50%,
60%th, 70%, 80%, 90%, 100% site is revealed.
If the superposition of different size of CMY site, it is the formation of shades of colour, as shown in Figure 2.
Constitute CMYK chromatograph around this principle.Specific method is to arrive CMYK tetra- color respectively by dot area 0%
100% various combination is made.
Such as one CMYK chromatograph has page 255, and wherein in one page, C site from top to bottom is 0% to 100%, M
From left to right site is 0% to 100%, and Y=5%, K=5% are fixed numbers, as shown in Figure 3：
But, through use for many years, find that the CMYK chromatograph for printing is very big with the relation of printing condition.First
Show the raw and auxiliary material that printing uses, such as paper and ink, the paper difference that different manufacturers provide is very big, directly affects
The tone of light colour；The completely inconsistent tone that have impact on printing field density of the printing-ink that each ink producer manufactures,
Identical C, M, the color value difference of the double exposure color of Y, K site double exposure are also larger.
The difference of each printing house printing condition also greatly have impact on the tone of printing, mainly printing net-point amplification degree
Difference, the site of 50% can print off 60% to 80% different color on different printer.
Therefore, the printing chromatograph of a CMYK only has reference significance under identical printing condition, changes printed strip
Part will be possible to inaccurate.That is the chromatograph that our factory makes only has to the actual production of our factory directly knows meaning,
The chromatograph of other producer can only play reference role.
Identical CMYK color value adopts different printing equipments, different printing conditions, different printing raw and auxiliary materials
The color of produced chromatograph is different, and we are referred to as " color space with device-dependent ".
The thinking solving this problem is must to adopt " with device-independent color space ", for this reason, we need to try one's best
Research and development, have preferably found a kind of solution of effectively solving prior art defect.
Content of the invention
The main object of the present invention is to provide a kind of manufacture method of LAB chromatograph.
For achieving the above object, the present invention takes following design：
A kind of manufacture method of LAB chromatograph, its manufacture method is as follows：
1) call the Lch coordinate-system of LAB color space, in its ch plane, equal portions segmentation is carried out with hue angle h, and from
0 to 360 degree sequentially press part sequence paging；
Wherein, in the ch plane of Lch coordinate-system：Hue angle h=arctg (b/a), a axle and b axle are chrominance axis, a axle
For red-green axle, its span is -128 to 127；B axle is yellow-blue axle, and its span is also -128 to 127；
2) carry out every page of color lump typesetting, in the color lump typesetting of each page, with the luminance axis L of color lump color in span
Interior value divides seniority among brothers and sisters, and wherein luminance axis L span is 0 to 100；With colourity a of color lump color, colourity b and saturation c
Combination value be partitioning standards divide arrangement.
For example in fig. 9 a in the 2nd row, a=10, b=10, c=[(102+102)]1/2=14；In 6th row, a=50, b=
50, c=[(502+502)]1/2=71；In 7th row, a=60, b=60, c=[(602+602)]1/2=85, because this color surpasses
Cross print range, be therefore the white of paper.
In this page, because each color lump is a=b, therefore hue angle is h=arctg (b/a)=arctg (10/10)
1=45 ° of=arctg of=arctg (50/50) ....
In the manufacture method of described LAB chromatograph, it is respectively marked with CMYK numerical value under each color lump, representated by this CMYK numerical value
The solid colour that color is represented with this LAB chromatograph color lump.
In the manufacture method of described LAB chromatograph, in described ch plane, in the range of 0 to 360 degree, solid at interval of one
Fixed angle is divided into one page, is divided into (the 360/ fixed angles number of degrees) page.
In the manufacture method of described LAB chromatograph, in every page of typesetting, take luminance axis L=10,20,30,40,50,60,
70th, 80,90, set 9 row altogether.
It is a further object of the present invention to provide a kind of purposes of LAB chromatograph.
For achieving the above object, the present invention takes following design：
A kind of as mentioned above in the LAB chromatograph of any one purposes, its be used for the color space with device-dependent and with
Carry out the exchange of color between device-independent color space.Especially could be between LAB color and printer color or
Swap between LAB color and print color.The international standard that printing adopts is ISO 12647.
A kind of as mentioned above in the LAB chromatograph of any one purposes, it is used for carrying out the color conversion across media.
It is an advantage of the invention that：Multi-hardware equipment performance and state can not have been received in LAB spectral color application of the present invention
Impact, widened the scope using, be especially applicable in printing, as long as to operate according to printing standard, just can be maximum to the greatest extent
The consistency of colour of can guarantee that.
Brief description
Fig. 1 is the schematic diagram of the size corresponding apparent color depth in site in prior art printing.
Fig. 2 a and Fig. 2 b is for forming the schematic diagram of color after different size of CMY site superposition in prior art printing.
Fig. 3 is one page schematic diagram in existing CMYK chromatograph.
Fig. 4 is the schematic diagram of LAB color space used by the present invention.
Fig. 5 is the AB plane graph in LAB color space used by the present invention.
Fig. 6 is the LA plane graph in LAB color space used by the present invention.
Fig. 7 is the LB plane graph in LAB color space used by the present invention.
Fig. 8 is ch floor map in the Lch coordinate-system that LAB color space used by the present invention is formed.
The schematic diagram of a part of page in the LAB chromatograph that Fig. 9 a, 9b, 9c and 9d make for the present invention.
Below in conjunction with the accompanying drawings and specific embodiment is described in further details to the present invention.
Specific embodiment
Refering to shown in Fig. 1, " with device-independent color space " that make main employing of LAB chromatograph of the present invention is and people
Relevant CIELAB (hereinafter referred to as LAB) color space of eye color perception, Fig. 4 axonometric chart represents this LAB color space, figure
5th, Fig. 6 and Fig. 7 is respectively with the AB plane in plan representation LAB color space, LA plane and LB plane.
Wherein, L is luminance axis, and L is bigger, and color is brighter, and the less color of L is darker, and its span is 0 to 100, such as L=
Be equivalent to when 50 50% black；A and b is chrominance axis, and a axle is red-green axle, and a is on the occasion of being red color, and a is green color for negative value,
Its span is -128 to 127；B axle is yellow-blue axle, and b is on the occasion of being yellow color, and b is blue color for negative value, its span
It is also -128 to 127.
LAB color space also can use polar coordinate representation, forms Lch coordinate-system, and its ch plane is as shown in Figure 8.
Wherein c is called saturation, c=[(a2+b2)]1/2.
H is called hue angle, h=arctg (b/a).
Because LAB color space is and device-independent color space, color only, its color relevant with human eye color perception
Do not affected by any hardware device performance and state, LAB chromatograph therefore of the present invention can be represented with Lch polar form.This
The LAB chromatograph of invention is pressed hue angle h and is determined the page number, and from 0 to 360 degree, the angle every a fixation is divided into one page, is divided into
(the 360/ fixed angles number of degrees) page, for example：Every a fixation 1 degree of angle, 2 degree, 3 degree, 4 degree, 5 degree～120 degree or 180 degree divide
For one page, correspond to respectively and be divided into page 360, page 180, page 120, page 90, page 66～page 3 or page 2.
Shown in Fig. 9 a, 9b, 9c and 9d is several figures in same preferred embodiment, every the angle 15 of a fixation
Degree is divided into one page, is divided into page 24, Fig. 9 a, 9b, 9c and 9d show a part of typesetting page in the present embodiment LAB chromatograph,
Fig. 9 a is illustrated that a typesetting page in the present embodiment LAB chromatograph.
It is the one page in LAB chromatograph shown in Fig. 9 a, hue angle=45 °.Wherein have 9 row, respectively L=10,20,30,
40、50、60、70、80、90；L=0 is completely black, L=100 is entirely white, does not therefore adopt.This page has 8 row, respectively a=
0, b=0, a=10, b=10, a=20, b=20, a=30, b=30, a=40, b=40, a=50, b=50；Row quantity with
The colour gamut (the combination value of a, b and saturation c) of color is relevant, that is, there being the color lump on the right of color color lump, color do not exist or
Print is not out.This is that therefore colour gamut may be wanted than actual color because this chromatograph is using the CMYK color printing with device-dependent
Smaller.
C therein represents saturation, c=[(a2+b2)]1/2.For example in the 2nd row, a=10, b=10, c=[(102+
102)]1/2=14.
In this page, because each color lump is a=b, therefore hue angle is h=arctg (b/a)=arctg (10/10)
1=45 ° of=arctg of=arctg (20/20) ....
Fig. 9 a, 9b, 9c and 9d show only the typesetting page of LAB chromatographic fraction of the present invention, according to the description of this specification
And the accessory exhibition of diagram, any page of this LAB chromatograph all can make by complete independently, the total page number in concrete application example and
In every page, (without departing from the design philosophy of the present invention) definition also can be specifically planned in the distribution of row, column according to implementer, herein not
Repeat one by one again.
It is respectively marked with CMYK numerical value under every piece of color lump, for example, have mark under the color lump of L=90, a=10, b=10, c=14
There is the color lump of C=1, M=19, Y=17, K=0.Color space with device-dependent and unrelated with equipment can preferably be ensured
Color space consistency of colour.
As long as it was verified that to operate in strict accordance with printing standard, it is ensured that consistency of colour.The state of printing at present
Border standard is ISO 12647.
Wherein, quality standard mainly has：
1st, the color of paper：In standard, paper is divided into 5 classes
(1) gloss paint paper：L*=95a*=0b*=-2
(2) sub- optical coating paper：L*=94a*=0b*=-2
(3) gloss paint roll web：L*=92a*=0b*=5
(4) no coated paper, white：L*=95a*=0b*=-2
(5) no coated paper, yellow：L*=90a*=0b*=9
Wherein, franchise L is ± 2 for ± 3, a and b.
2nd, the color of ink：Illustrate (being shown in Table 1) by paper 1 class and 2 classes
The color lump on the spot of table 1 green grass or young crops, pinkish red, Huang and double exposure color and black, grey block L*、a*、b*Value
| Blue or green | Pinkish red | Yellow | Black | L* | * | b* |
| 0 | 0 | 100 | 0 | 91 | -5 | 93 |
| 0 | 100 | 0 | 0 | 48 | 74 | -3 |
| 100 | 0 | 0 | 0 | 55 | -36 | -49 |
| 0 | 0 | 0 | 100 | 16 | 0 | 0 |
| 0 | 100 | 100 | 0 | 49 | 69 | 52 |
| 100 | 0 | 100 | 0 | 50 | -68 | 33 |
| 100 | 100 | 0 | 0 | 20 | 25 | -49 |
| 100 | 100 | 100 | 0 | 18 | 3 | 0 |
3rd, tone value increases：Dot gain rate (is shown in Table 2)
The dot gain rate standard of table 21 class paper is：
The present invention is the LAB chromatograph that the international standard according to printing makes, each color lump with spectrophotometer measurement, and
The numerical value of definition compares the numerical value having obtained aberration Δ E, and its aberration all meets international standard, i.e. aberration Δ E>6, specifically
Numerical value is shown in Table 3 (one page in LAB chromatograph, hue angle=45 °).
The accuracy of table 3 LAB chromatograph
The various embodiments described above can in some changes in addition without departing from the scope of the invention, therefore above explanation comprised and
Structure shown in accompanying drawing should be regarded as exemplary, and be not used to limit the application patent protection domain.
Claims (8)
1. a kind of manufacture method of LAB chromatograph is it is characterised in that manufacture method is as follows：
1) call the Lch coordinate-system of LAB color space color-values, in its ch plane, from 0 to 360 degree, every a fixation
Angle be divided into one page, by hue angle h determine the page number, sequentially arrange page；
Wherein, in the ch plane of Lch coordinate-system：Hue angle h=arctg (b/a), a axle and b axle are chrominance axis, and a axle is
Red-green axle, its span is -128 to 127；B axle is yellow-blue axle, and its span is also -128 to 127；
2) carry out every page of color lump typesetting, in the color lump typesetting of each page, with the luminance axis L of color lump color in span
Value divides seniority among brothers and sisters, and wherein luminance axis L span is 0 to 100；With the colour gamut of color lump color color in this page for divide according to
Arrange according to dividing.
2. LAB chromatograph according to claim 1 manufacture method it is characterised in that：It is respectively marked with printing under each color lump
CMYK numerical value, the solid colour that this color representated by CMYK numerical value and this LAB chromatograph color lump represent.
3. LAB chromatograph according to claim 1 manufacture method it is characterised in that：Every a fixation 10 degree of angle,
15 degree, 20 degree, 30 degree or 40 degree are divided into one page, and correspondence is divided into page 36, page 24, page 18, page 12 or page 9.
4. LAB chromatograph according to claim 3 manufacture method it is characterised in that：In every page of typesetting, take luminance axis
L=10,20,30,40,50,60,70,80,90, set 9 row altogether.Even if points page 9, every page be also take luminance axis L=10,20,30,
40th, 50,60,70,80,90, set 9 row altogether.
5. in a kind of Claims 1-4 any one described LAB chromatograph purposes it is characterised in that：For with device-dependent
Color space and the exchange carrying out color and device-independent color space between.
6. LAB chromatograph according to claim 5 purposes it is characterised in that：For between LAB color and printer color
Or swap between LAB color and print color.
7. LAB chromatograph according to claim 6 purposes it is characterised in that：The international standard of described printing is ISO
12647.
8. in a kind of Claims 1-4 any one described LAB chromatograph purposes it is characterised in that：For carrying out across media
Color conversion.
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| CN201610798716.XA CN106385524A (en) | 2016-08-31 | 2016-08-31 | LAB chromatography manufacturing method and application |
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| CN201610798716.XA CN106385524A (en) | 2016-08-31 | 2016-08-31 | LAB chromatography manufacturing method and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113538692A (en) * | 2021-06-16 | 2021-10-22 | 江南大学 | Lab gridding model construction and method for visualizing isocandela hue chromatograms of isocandela lightness and isocandela saturation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113538692A (en) * | 2021-06-16 | 2021-10-22 | 江南大学 | Lab gridding model construction and method for visualizing isocandela hue chromatograms of isocandela lightness and isocandela saturation |
| CN113538692B (en) * | 2021-06-16 | 2024-05-07 | 江南大学 | Lab gridding model construction and equal brightness equal saturation equal color phase chromatography visualization method |
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