CN104270551B - A kind of four-dimensional conversion method to digital picture - Google Patents

A kind of four-dimensional conversion method to digital picture Download PDF

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Publication number
CN104270551B
CN104270551B CN201410510399.8A CN201410510399A CN104270551B CN 104270551 B CN104270551 B CN 104270551B CN 201410510399 A CN201410510399 A CN 201410510399A CN 104270551 B CN104270551 B CN 104270551B
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Prior art keywords
color
conversion method
digital picture
dimensional conversion
target
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CN201410510399.8A
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CN104270551A (en
Inventor
唐小兴
廖晓华
王小斌
宋强
葛侬
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Beijing culture science and technology finance leasing Limited by Share Ltd
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SHANGHAI ARTRON ART PRINTING Co Ltd
SHENZHEN ARTRON COLOR PRINTING CO Ltd
BEIJING ARTRON ART PRINTING Co Ltd
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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
    • H04N1/54—Conversion of colour picture signals to a plurality of signals some of which represent particular mixed colours, e.g. for textile printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • 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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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)

Abstract

Present invention relates particularly to a kind of four-dimensional conversion method to digital picture, belong to digital image processing field, according to switch target characteristic file, establish transformational relation；According to transformational relation, image change data corresponding table is established；Color color separation and color conversion are carried out to image change data corresponding table；According to the image change data corresponding table after conversion, converting digital image file is matched；The compared to the prior art possessed beneficial effect of the present invention：Directly changed using source color space to the match colors mode of targeted colorspace and connect color space without centre, avoid the loss of image information in color conversion processes, there is more preferably reducing power；The batch processing changed between color space, color mode is carried out to image by way of data corresponding table, converted images are stored in identical file folder, ensure the relative independentability of data, convenient and swift, the chance that artificial treatment malfunctions during reducing before print.

Description

A kind of four-dimensional conversion method to digital picture
Technical field
Present invention relates particularly to a kind of four-dimensional conversion method to digital picture, belong to digital printing technologies field.
Background technology
Conventional image conversion regime is that the color between dependent color spaces is carried out by Photoshop in the market Color separation and color conversion.The general principle of Photoshop conversions is the sky from CMYK space to Lab by ICC characteristic files Between, then a kind of method of work to CMYK spaces, from CMYK four-dimensional color space conversion to Lab three-dimensional color spaces, then Four kinds of mapping modes such as relative value, absolute value, saturation degree, vision can be used to CMYK four-dimension color spaces, during conversion in reconvert.
But traditional ICC color characteristic file conversion regimes are used as by connecting color space (PCS) among one Bridge carries out the conversion between two spaces, and there is the limitation of following several respects for this mode：
From CMYK four-dimension color space conversion to Lab three-dimensional color spaces and then reconvert is to CMYK four-dimension color spaces, After by changing twice, color accuracy loss is larger, and the degree of accuracy is also influenceed by certain.
It is to be carried out by way of look-up table (LUT-Look up Table) in same ICC inputs and output file Match somebody with somebody, there is different black prints to set, have more uncertain, it is impossible to ensure the standard of color data information before and after image conversion Uniformity, at present ICC color characteristic files conversion regime there was only 90% or so color rendition precision；
For carrying out color space conversion operating aspect to high-volume picture, fail to meet to pursue high efficiency, high quality Production requirement.
The content of the invention
Lost in order to avoid running into image level, make color be easier to control, ensure the relative independentability of data, conversion side Just it is quick；The present invention provides a kind of four-dimensional conversion method to digital picture, the four-dimensional conversion method bag to digital picture Include following steps,
Step 1) establishes transformational relation according to switch target characteristic file；
Step 2) establishes image change data corresponding table according to the transformational relation；
Step 3) carries out color color separation to described image change data corresponding table and color is changed；
Step 4) matches converting digital image file according to the described image change data corresponding table after conversion.
The step 1) further comprises following steps,
Step 1.1) judges the switch target colour gamut and source color space colour gamut size, defines color space white point；
Step 1.2) sets total ink according to the switch target characteristic file and source color space GCR degree Amount, black print starting point and black print content；
Step 1.3) sets double exposure color and the black passage purity on the spot for retaining CMY color on the spot, RGB；
Step 1.4) is changed according to different switching target and set, and source colouring information is matched in switch target colour gamut.
Further, the switch target characteristic file obtains as follows,
Step a) design object color targets：
Step b) prints the aim colour target；
The color data of the aim colour target after step c) collection printings；
Step d) gathers the color data, determines switch target characteristic file.
Further, print the aim colour target and select and meet the type of ISO12647-2 standards 1 or the type of ISO12647-2 standards 2 Coating class paper.
Further, print the aim colour target and select CTP mode.
Further, the plate-making condition of the CTP mode is that plate type uses positive-type PS plate, is shown Shadow liquid electrical conductivity is 42.5 ± 0.3ms/s, and development temperature is 29 ± 0.5 DEG C, developing powder 232cm/min.
Further, it is 2088 that the aim colour target, which includes color lump quantity,.
Further, the collection of the color data is based on T-shaped state, no polarization light filter and subtracts the white detector bar of paper Part.
Further, total ink amount is 355, and the black print starting point is 5%, and the black print content is 100%.
The compared to the prior art possessed beneficial effect of the present invention：Directly changed to color of object using source color space The match colors mode in space connects color space without centre, avoids image information in color conversion processes from losing Lose, there is more preferably reducing power；Batch for image change between color space, color mode by data corresponding table Processing, converted images are stored in identical file folder, ensure the relative independentability of data, convenient and swift, reduce the mistake before print The chance that artificial treatment malfunctions in journey.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the present invention to the four-dimensional conversion method of digital picture；
Fig. 2 establishes transformational relation method flow schematic diagram for the four-dimensional conversion method of the invention to digital picture；
Fig. 3 is that the present invention illustrates to the acquisition switch target characteristic file method flow of the four-dimensional conversion method of digital picture Figure；
Fig. 4 is effect diagram of the present invention to the four-dimensional conversion method of digital picture；
Fig. 5 is effect diagram of the present invention to the four-dimensional conversion method of digital picture,
Embodiment
When considered in conjunction with the accompanying drawings, by referring to following detailed description, can more completely more fully understand the present invention with And easily learn many of which with the advantages of, but accompanying drawing described herein be used for a further understanding of the present invention is provided, Form the part of the present invention.
In order to facilitate the understanding of the purposes, features and advantages of the present invention, with reference to accompanying drawing and specific embodiment party The present invention is further detailed explanation for formula.
Embodiment：As shown in figure 1, the present embodiment provides a kind of four-dimensional conversion method to digital picture, including following step Suddenly,
Step 1) design object color target：
Step 2) prints aim colour target；
Step 3) gathers the color data of the aim colour target after printing using X-rite isis instruments；
Step 4) determines switch target characteristic file according to the color data of collection；
Step 5) establishes transformational relation according to switch target characteristic file；
Step 6) establishes image change data corresponding table according to transformational relation；
Step 7) carries out color color separation to image change data corresponding table and color is changed；
Step 8) matches converting digital image file according to the image change data corresponding table after conversion.
The present embodiment has the following technical effect that：By data corresponding table to image carry out color space, color mode it Between the batch processing changed, converted images are stored in identical file folder, ensure the relative independentability of data, convenient and swift, are subtracted The chance that artificial treatment malfunctions during lacking before print.
In preferable scheme, the step 5) further comprises following steps,
Step 1) judges switch target colour gamut and source color space colour gamut size, defines color space white point；
Step 2) sets total ink measure, be black according to switch target characteristic file and source color space GCR degree Version starting point and black print content；
Step 3) sets double exposure color and the black passage purity on the spot for retaining CMY color on the spot, RGB；
Step 4) is changed according to different switching target and set, and source colouring information is matched in switch target colour gamut.
The present embodiment has the following technical effect that：Directly changed to the color of targeted colorspace using source color space Color space is connected without centre with mode, avoids the loss of image information in color conversion processes, is had more preferable Reducing power.
In preferable scheme, step 2) is further to print the aim colour target and select to meet ISO12647-2 standards 1 The coating class paper of type or the type of ISO12647-2 standards 2.
Printing-ink possesses following characteristics：
Table 1：Printing-ink parameter
In preferable scheme, printing aim colour target selects CTP mode,
In preferable scheme, the CTP mode possesses following characteristics：
Table 2：Platemaking parameter
In preferable scheme, it is 2088 that aim colour target, which includes color lump quantity,.
In preferable scheme, the collection of color data is based on T-shaped state, no polarization light filter and subtracts the white detector bar of paper Part.
In preferable scheme, total ink amount is 355, and black print starting point is 5%, and black print content is 100%.
In preferable scheme, white point refers to the most pure and mild most bright white in color gamut space.
Table 3：C, M, Y, K, R, G, B print the front and rear reservation purity of Essential colour conversion
Table 4：Middle shadow contrast color separation
The conversion of four colors keeps channels independence, and being effectively retained for four chrominance channels is printed after conversion, without redefining point Color；Be advantageous to the control of grey balance and dot gain in printing process, it is ensured that each site contrast, level are effectively retained.
Table 5：Conversion method of the present invention and traditional Photoshop conversion methods are changed to color management system in enterprise When, standard color target color aberration statistics
Otherness is obviously reduced between printed matter and international standard after being changed by this patent conversion method, and print product is more Meet international printing standard, matching is higher before and after conversion.
Table 6：The cmyk data that source printed data obtains after this patent method migration and Photoshop conversions
From data, this patent conversion method carries out independent conversion to C, M, Y, K four-way, not by shadow between passage Ring, the control remained with beneficial to printing grey balance of four chrominance channels is printed after conversion；C, M, Y, K four-way after Photoshop conversions Track data redefines, different very big with source printed data, easily causes the loss of level, matching undesirable situation can cause The color colour cast such as black, grey version and neutral ash.
A kind of four-dimensional conversion method to digital picture provided by the present invention is described in detail above, above ginseng The exemplary embodiment of the application is described according to accompanying drawing.It should be appreciated by those skilled in the art that above-mentioned embodiment party Purpose that case is merely to illustrate that and the example lifted, rather than for being limited, it is all in teachings of the present application and right Any modification made under scope, equivalent substitution etc. is claimed, should be included in this application claims in the range of.

Claims (8)

  1. A kind of 1. four-dimensional conversion method to digital picture, it is characterised in that comprise the following steps,
    Step 1) establishes transformational relation according to switch target characteristic file；
    Step 2) establishes image change data corresponding table according to the transformational relation；
    Step 3) carries out color color separation to described image change data corresponding table and color is changed；
    Step 4) matches converting digital image file according to the described image change data corresponding table after conversion；
    The step 1) further comprises following steps:
    Step 1.1) judges the switch target colour gamut and source color space colour gamut size, defines color space white point；
    Step 1.2) according to the switch target characteristic file and source color space GCR degree, set total ink amount, Black print starting point and black print content；
    Step 1.3) sets double exposure color and the black passage purity on the spot for retaining CMY color on the spot, RGB；
    Step 1.4) is changed according to different switching target and set, and source colouring information is matched in switch target colour gamut.
  2. 2. the four-dimensional conversion method according to claim 1 to digital picture, it is characterised in that
    The switch target characteristic file obtains as follows:
    Step a) design object color targets：
    Step b) prints the aim colour target；
    The color data of the aim colour target after step c) collection printings；
    Step d) gathers the color data, determines switch target characteristic file.
  3. 3. the four-dimensional conversion method according to claim 2 to digital picture, it is characterised in that
    The aim colour target is printed from the coating class paper for meeting the type of ISO 12647-2 standards 1 or the type of ISO 12647-2 standards 2 .
  4. 4. the four-dimensional conversion method according to claim 3 to digital picture, it is characterised in that
    Print the aim colour target and select CTP mode.
  5. 5. the four-dimensional conversion method according to claim 4 to digital picture, it is characterised in that
    The plate-making condition of the CTP mode is that plate type uses positive-type PS plate, and developer solution electrical conductivity is 42.5 ± 0.3ms/s, development temperature are 29 ± 0.5 DEG C, developing powder 232cm/min.
  6. 6. the four-dimensional conversion method according to claim 5 to digital picture, it is characterised in that
    It is 2088 that the aim colour target, which includes color lump quantity,.
  7. 7. the four-dimensional conversion method according to claim 6 to digital picture, it is characterised in that
    The collection of the color data is based on T-shaped state, no polarization light filter and subtracts the white testing conditions of paper.
  8. 8. the four-dimensional conversion method according to claim 7 to digital picture, it is characterised in that
    Total ink amount is 355, and the black print starting point is 5%, and the black print content is 100%.
CN201410510399.8A 2014-09-28 2014-09-28 A kind of four-dimensional conversion method to digital picture Active CN104270551B (en)

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Publication number Priority date Publication date Assignee Title
CN108437440B (en) * 2018-03-21 2020-06-19 北京印刷学院 3D printing color presentation method, device and system based on color management
CN110659000B (en) * 2018-06-28 2021-07-02 北大方正集团有限公司 Ink conversion method, device and equipment

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CN103841292A (en) * 2012-11-20 2014-06-04 艾塔斯科技（镇江）有限公司 Operating method of scanner and scanner

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JP3931886B2 (en) * 2004-03-30 2007-06-20 コニカミノルタビジネステクノロジーズ株式会社 Device link profile creation method and apparatus, and image processing apparatus
US20070296984A1 (en) * 2006-06-21 2007-12-27 Kabushiki Kaisha Toshiba System and method for device specific color space conversion

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Publication number Priority date Publication date Assignee Title
CN103841292A (en) * 2012-11-20 2014-06-04 艾塔斯科技（镇江）有限公司 Operating method of scanner and scanner

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Effective date of registration: 20190520

Address after: 101303 No. 3 Dasheng Road, Jinma Garden, Gaoliying Town, Shunyi District, Beijing

Co-patentee after: SHENZHEN ARTRON COLOR PRINTING CO., LTD.

Patentee after: BEIJING ARTRON ART PRINTING CO., LTD.

Address before: 101312 Beijing Shunyi District Tianzhu Airport Industrial Zone Area A Tianwei Fourth Street 7

Co-patentee before: SHENZHEN ARTRON COLOR PRINTING CO., LTD.

Patentee before: BEIJING ARTRON ART PRINTING CO., LTD.

Co-patentee before: SHANGHAI ARTRON ART PRINTING CO., LTD.

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Effective date of registration: 20190604

Address after: Room 711, Building 2, Courtyard 1, Jinhang Middle Road, Shunyi District, Beijing 101300

Patentee after: Beijing culture science and technology finance leasing Limited by Share Ltd

Address before: 101303 No. 3 Dasheng Road, Jinma Garden, Gaoliying Town, Shunyi District, Beijing

Co-patentee before: SHENZHEN ARTRON COLOR PRINTING CO., LTD.

Patentee before: BEIJING ARTRON ART PRINTING CO., LTD.

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