This standard specifies the input data files, measurement methods and output data formats suitable for characterizing the characteristics of any four-color printing process. GB/T 20439-2006 Printing technology Prepress data exchange Input data for characterizing four-color printing GB/T20439-2006 standard download decompression password: www.bzxz.net
This standard specifies the input data files, measurement methods and output data formats suitable for characterizing the characteristics of any four-color printing process.

ICS 37. 100. 01
National Standard of the People's Republic of China
GB/T 20439—2006/IS0 12642:1996Graphic technologyPrepress digital data exchange-Input data for characterization of 4-colour process printing(IS0 12642:1996.1DI)
061214000022
Published on 2006-07-25
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
Implemented on 2007-05-01
GB/T 20439—2006/ISO 12642: 1996Foreword
1Scope
2Normative references
3Terms and definitions
4Technical requirements
Appendix A (informative)
Appendix B (informative)
Notes on use
KeywordsGeneral description of data file format+++
GB/T 20439-2006/ISO 12642:1996 This standard is equivalent to IS012642:1996α Printing technology prepress data exchange for input data for four-color printing feature description". The content of this standard is closely related to the content of GB/T18721-2002 "Printing technology prepress data exchange CMYK standard color image data (CMYK/SCID)". The formulation of this standard is of great significance to the promotion and application of GB13/TI8721 in the printing industry. Appendices A and B of this standard are both informative appendices. This standard is proposed by the General Administration of Press and Publication of the People's Republic of China. This standard is under the jurisdiction of the National Printing Standardization Technical Committee, and the drafting unit of this standard is China Printing Science and Technology Research Institute. The main drafters of this standard are Li Jiaxiang and Ma Zhijian. This standard is interpreted by the National Printing Standardization Technical Committee. GB/T 20439-2006/ISO 12642:1996 Background Overview
The technical content of this standard is equivalent to the American National Standard ANS1/IT8.7/3 1993. The AVSI (American National Standards Institute) document is the result of the participation of an international industrial group including a large number of prepress equipment manufacturers, film manufacturers and users. This group was originally called the DDES (Digital Data Exchange Standards) Committee and later became the founding name of the ANSIIT8 (Printing Technology Committee) responsible for developing prepress electronic data exchange standards recognized by the American Standards Institute. When color information is transmitted between electronic publishing systems, it is essential to define the color in an unambiguous way. It can be inferred from the experimental data that for central retinal vision, it can be achieved by determining the "mixture of linearly independent stimulus values" required to match a certain color. In 131, the International Illumination Association (IF) developed a complete color definition system based on experimental data published ten years ago. These data confirm the similarity of this color matching between observers. It has been recognized to use this system and its derivative systems to standardize colors.
However, many halftone color printing processes require more than three color inks. There are two main reasons for this. First, the color gamut that can be achieved with three color inks is quite limited, and adding other colors The addition of additional inks can effectively expand the color gamut. On the other hand, adding other colors of ink can also reduce the visual changes caused by color changes and overprinting errors during the process. The fourth most commonly used ink is black ink, and four-color printing has become the most common printing method. Generally speaking, the addition of additional inks means that the color cannot be uniquely defined. In this way, different ink combinations can be used to achieve the same color in different parts of the printed sheet. In many practical applications, it is more convenient to directly specify this ink combination than to obtain it according to the color separation rules, which leads to the need to transmit four-color data for specific device modes. If the same data is used in different fields, or if the data needs to be modified due to different printing suitability, some other information needs to be added so that the data receiver can interpret it. This standard is To achieve this, this standard provides a set of data that can be transmitted with the image and, if necessary, made device-independent or adjusted for different print suitability. The tools provided by this standard can be used to characterize output systems. The work undertaken by the committee is to generate data for the major types of screen-adjusting printing processes that have been identified internationally: this process is described in the Application Notes (Appendix A).
This standard specifies the ink values ​​used for all four-color (cyan, magenta, yellow, black) screen-adjustment processes (including back-printing). These ink values ​​are defined using mathematical data in a computer or using halftone values ​​on film. This requires special attention to film preparation to ensure that the output device is correctly "linearized" and adjusted, and that the film's screen is properly adjusted. The target tone values ​​are matched to the digital data in the computer file. For some applications, the film values ​​used for linearization adjustment can be reproduced from the film produced by the film recorder in one or more copies. This standard also includes test methods and data formats for determining and reporting tristimulus values ​​(X, Y, Z). While the techniques described in the technical standard are applicable to all output methods, these data have been optimized for four-color halftone printing. For non-screen printing or those using colorants that are completely different from typical printing inks, the data files should be reproduced to provide relatively uniform color differences. For systems that do not meet this criterion, user-selected data can be used: relevant suggestions are attached in the notes below, but they are not part of this standard. It should be noted that this standard does not specify the arrangement and size of the cells. This is because any such decision depends on the printing equipment to be used and the color sample area required for color measurement. It is expected that a special color scale layout will be designed to meet the needs of users. In order to meet the color measurement needs of various printing machines included in the future appendix, it is necessary to design a special color scale layout. Its structure is four groups of small color blocks. This arrangement has been adopted by ANSI/CGATS and IS0/TC130. The data described in the appropriate file format in TC130 is included in the images S7 to S10 of ISO12640 (i.e. GB/T[8721]) Standard Color Package Image Data (SCID). In order to provide guidance for other forms of arrangement, this arrangement is shown in Figure A, 1. Technical Background
i.e. Print Sustainability
CB/T 20439--2006/IS012642:1996 In the past 20 years, people have made various efforts to reduce the quality variation between various printing machines. Initially, standards such as ISO 2846 for the color and transparency of technical color printing inks were developed to regulate the color characteristics of printed ink accumulations. Later, the most significant achievement was the specification of the transfer of ink accumulations to paper developed by the German Institute of FXRA/BVI, which was achieved by specifying the reflective density or tristimulus of the standard solid printing ink film and the optical density error of the various screen values ​​reproduced. In the international printing industry, these technical specifications are widely recognized and, in many cases, are regarded as de facto printing standards. For journal and magazine printing, SWP (in the United States) and FIPP (in Europe) are widely recognized standards. For commercial printing, the technical specifications developed by FORA and IIRA are well known in Europe and have been extended to newspaper printing. It should be noted that any characterization of the printing process should take into account all the steps in the printing process, namely separation, copying (if necessary) and exposure: All printing specifications related to the above steps include recommended values ​​to maintain operational consistency and ensure the validity of the characteristic parameters:
When printing conditions differ from the published specifications, there are two options, either if large areas of color patches can be printed and measured, or the printing process can be analyzed and modeled: The advantage of this method is that only a few color measurement points are required, and the disadvantage is that the prediction accuracy is not high. In many applications, a good compromise is to modify the published data through the model. These will be discussed in more detail in the notes.
Choice of color patches
In general, measuring standard color samples can accurately describe the color characteristics of the printing process. It is difficult to determine exactly how many sample samples are needed.The number of steps depends on many factors, including the accuracy of the desired color reproduction, the uniformity of the color sampling intervals, the type of calculation method used, and the nonlinear characteristics of certain printing methods. However, practical experience has shown that when measuring the combination of six levels of cyan, magenta, yellow and black, it is best to focus on measuring the lower dot values. Usually, fewer points can be sampled in the higher dot value areas of black because the color difference between the sample points in this area is very small. Adding a single color scale with more gradation values ​​can help determine the local linearity. For most printing methods, the accuracy is sufficient. A small amount of data set may be used if: only a low-precision description of the characteristics is required:
The printing process can be accurately simulated using a well-known model listed in the instructions: The purpose of the measurement is to make a small correction to the accurately described characteristics. The advantages of this method are that the measurement workload is significantly reduced and the file size of the data is greatly reduced. This approach is advantageous when image reduction is required, even for relatively small files, which are smaller than most images. This standard defines a palette of 928 cyan, magenta, yellow and black ink value sets. This palette (hereafter referred to as the extended ink value set) has been measured to provide data on color characteristics in the main printing specifications. In some cases where such complexity is not required, a secondary palette of 182 colors (hereafter referred to as the basic ink value set) has been defined, which provides data suitable for a variety of simulation methods. The data provided is wider than required for a particular method and covers almost all published simulation methods. For characteristics that cannot be described by the data sets defined in this specification, any number of data sets can be selected by the user. The data format is specified in the specification. It is expected that the basic data set will be used as the default data file and placed in the header of the image file to be exchanged: and larger data sets can be provided when required with prior agreement. The purpose of the color palette, AVS IIT8/SC4 and ISO/TC130/W (2 months) is to cooperate with the organizations responsible for the definition of printing (such as SWOP, FOCRA, etc.) to issue color data sheets that meet the requirements of the specified printing conditions. When these data are reported using the IS door technology, these batches of data become "specified data". This means that the receiving device should use the published data and the data file should not be transmitted. In most cases, the data set using the old specification is sufficient. 1 Scope || tt || GB/T20439—2006/ISO 12642:1996 Printing technology Prepress data exchange Input data for characterization of four-color printing
This standard specifies input data files, measurement methods and output data formats suitable for characterizing the characteristics of any four-color printing process. 2 Normative references
The following documents contain clauses that, through reference to this standard, constitute clauses of this standard. For dated references, all subsequent amendments (excluding errata or revisions) are not applicable to this standard. However, parties to agreements based on this standard are encouraged to investigate whether the latest versions of these documents can be used. GB/T 18721
Printing search
For undated references, the latest version of the referenced documents shall apply to this standard. Prepress data exchange
(GB/T18721-2002, id)
ISO12640:1997)
G13/ 19437
199,D:)wwW.bzxz.Net
ISO/TEC 646
Terms and definitions
Printing technology
CMYK standard color image number (CMYK/SCIU) Spectral measurement and calculation of printed images (ISO 7-bit coded character set S for technical information exchange using GB/T 19437
The following terms and definitions are from this standard.
CIF tristimulus values
CIE trislimulus values
2004, ISO 13655:
Color system, the number of three reference colors required to match a specific color stimulus Note: In 1331 (TE standard
Color gamut color In the ganut
colorimetric system, the binary values ​​are represented by the symbols X, Y, and Y, and are called the subset of colors reproduced by some device or method. 3.3
half-tone dots
are the recording points with different frequencies or sizes that can produce a gradation image. Half-tone dots are usually quantified by the area they cover. The measurement of dot area comes from the Murray-Davies formula. Usually, the half-tone dots are used in the image. 3.4
keyword data file keywurd value file is a file that uses pre-defined data tables and keywords to exchange data in an open and extensible way. 3.5
processcolorprintiny uses three or more printing inks to reproduce color images. The primary color inks are cyan, magenta, yellow and black.
GB/T20439—2006/IS0 12642:19963.6
Ink valueinkvalue
In the reproduction process, the digital file value representing the amount of pigment required. For halftone printing, this value is equivalent to the halftone dot area expressed as a fraction.
Whitespace
The space occupied by characters that are not printed in the data file. Typical examples are spaces (position 2/0 in ISO/IF646), carriages (position 0/13 in ISO/IFC646), line feeds (position 0/10 in ISO/IEC:646) and tabs (position 0/9 in ISO/IFC646).
4 Technical requirements
4. 1 Data group definition
This standard defines two groups of ink values ​​obtained by combining the percentage of yellow, magenta, cyan and black dots at different intervals. The basic data group is a subset of the extended data group. If not specified, it is the default data group; if the extended data group (or its subset) is to be used, it must be specified in advance. Although the defined data is in mathematical form, not printed color standards (or color separation films), the chromaticity values ​​required to form a data file of color characteristics can be obtained by measuring printed color standards made with color separation films, and these color standards are derived from the ink value group defined above.
4.1.1 Basic ink value data group
The magenta, yellow and black ink values ​​specified in this group and their identification numbers (ID) are shown in Table 1. 4.1.2 Extended Ink Value Data Set
The extended data set shall include the values ​​in Table 1 in addition to the values ​​in Table 2. Note: The sample position codes in Table 2 correspond to the print format codes shown in Figure A.1. The codes are for reference only. 4.1.3 User Selected Data Set
In situations where a larger or differently spaced ink value data set is required, a user defined data set may be used. If a user data set is used, the selected ink values ​​shall be consistent with those specified in 4.4. 4.2 Color Measurement
The spectrophotometric measurement of color data on the printed sheet and the calculation of colorimetric data shall be performed in accordance with the requirements of R/T19437. For this standard, in special cases where it is considered that a non-black background is more suitable for measurement, the parts that differ from this standard shall be annotated. 4.3 Data Recording
According to 4.2 The colorimetric data required to be measured shall be recorded in the data file format specified in 4.4 as X, Y, Z three stimulus values, and shall be accurate to two decimal places.
The following additional data shall also be provided to more fully describe the measurement conditions: a) the person who measured the data; b) the date of establishment of the data;
the purpose of the data or the content of the data to be exchanged; c) the description of the instrument used, including but not limited to the brand and model of the instrument; e) the measurement light source (light source and filter ratio) and geometric conditions used; f) the wavelength interval and range used.
Note: The position data is for reference only.
-2006/150 12642:1996
GB/T 20439—
0306152666660666086888086638086333057008655800009082060030085330000black
there is a medical##
dot percentage
aowmo0a82man2o20oms88on28Rm699a00302mon282mon382mon30nmon3nmo0aonmmagenta
net333o58006030902332838O888327RR28333388cyan
84 00054992999388888948998223929Wuhan Law Enforcement and Law Enforcement Department has a pre-launch tourism project with community social technology college education medical insurance city life medical management equipment equipment program protection training road protection limit construction
Q000000o
1001000002000810060080080506000010000000200888000
Expanded ink value data set
18888388
5225499809099
Dot percentage
1322332282228
19989999
0039289
80989284
199892800
3283339084922262231
8800000828
00000nm
Hairun Equipment Service City Standard Training Approval Training Equipment Factoring District 8
# Business Insurance Limited Insurance Room
0000000
Percentage of Outlets
Electrical Appliances Factoring Limited
09080800880900996000100099080s
0008080008000090000995 9
1300898
09983392833234589
Han set city city
889230438880287
100004909800990037
89998905
22998099881
10084830589880385880388
098808388883349999982883888391.00
Wuhan City Medical Equipment Public Equipment Law Limited City City Engineering Limited Products
GB/T 20439—2006/1SO 12642:1996388888383388888883828883888888282388888812388888338888388388383223323882black
88388888888
point percentage
noaoan
30080000040n3aS888389353388222233355060000003000223 338905e78e283888889
Four public medical supervision you
China has limited public
and the kidney
Hufa travel has travel drug dealers medical travel equipment service limit
Wuhan Han Han Han Ji Li Xin area measurement limit and model situation visit data Pega travel
88287332838888222333243223339888833229322223982282
388523833823888888 2
Percentage of outlets
2 (continued)
38333388882282282
388883889
8288888800600
#Citymark
A89RS0
Dian82288
389898984999
333500
China Investment Medical Insurance Co., Ltd.
3034 26
999988288899999422
Local limit
00000038388233382822888382223323882823522882288552398832223238929883
Outlet 100% batch
00070000
1000003000000090000000889938HO3R923 0239R203890
535000322288
999888899988
1838989
133828225588903782
Wu Ke equipped with activities joint research certification research and development limited defense science active city construction new sea science 559889399868558
intelligent design sales supply public maintenance has a social program service has a public service city public lock sales security lock service committee service standardization program social service standard security machine security information Tax label made of silver and insurance board 1482
GB/T204392006/15012642:1996
Network point percentage
200920
123882882222882288
Public cooperation limit code limit training limit
Mai 2 (continued)
Network point percentage
Dian 30008622222
30000088228
303 0952222708
308928
ground machine defense research limit
point percentage
00888889
SNOO22R8R0
5300002398298439222229
##O00002##R2####RRRRR##
3933189302923
230052
1323039 8302923090
2009900
6000000828888889
138822
18888888
Yudaoyu:
8888885888
388888888888888
####
Your###
Dot percentage
Note: The position data is for reference only.
Table 2 (continued)
Dot percentage
GB/T20439—2006/IS0 126421996 sample
Dot percentage1996
Network point percentage
200920
12388288282222882288
Public cooperation limit code limit training limit
Mai 2 (continued)
Network point percentage
Electric 30008622222
30000088228
3030952222708
308928
Ground machine defense research limit
Network point percentage
00888889
SNOO22R8R0
5300002398298439222229
##O00002##R2####RRRRR##
3933189302923
230052
13230398302923090
2009900
6000000828888889
138822
18888888
Yu Dao Yu:
8888885888
388888888888888
the #of the #
your #of the #
percentage of outlets
Note: The location data is for reference only.
Table 2 (continued)
Dot-to-point ratio
GB/T20439—2006/IS0 126421996 Sample
Dot-to-point ratio1996
Network point percentage
200920
12388288282222882288
Public cooperation limit code limit training limit
Mai 2 (continued)
Network point percentage
Electric 30008622222
30000088228
3030952222708
308928
Ground machine defense research limit
Network point percentage
00888889
SNOO22R8R0
5300002398298439222229
##O00002##R2####RRRRR##
3933189302923
230052
13230398302923090
2009900
6000000828888889
138822
18888888
Yu Dao Yu:
8888885888
388888888888888
the #of the #
your #of the #
percentage of outlets
Note: The location data is for reference only.
Table 2 (continued)
Dot-to-point ratio
GB/T20439—2006/IS0 126421996 Sample
Dot-to-point ratio1996
Network point percentage
200920
12388288282222882288
Public cooperation limit code limit training limit
Mai 2 (continued)
Network point percentage
Electric 30008622222
30000088228
3030952222708
308928
Ground machine defense research limit
Network point percentage
00888889
SNOO22R8R0
5300002398298439222229
##O00002##R2####RRRRR##
3933189302923
230052
13230398302923090
2009900
6000000828888889
138822
18888888
Yu Dao Yu:
8888885888
388888888888888
the #of the #
your #of the #
percentage of outlets
Note: The location data is for reference only.
Table 2 (continued)
Dot-to-point ratio
GB/T20439—2006/IS0 126421996 Sample
Dot-to-point ratio1996
Network point percentage
200920
12388288282222882288
Public cooperation limit code limit training limit
Mai 2 (continued)
Network point percentage
Electric 30008622222
30000088228
3030952222708
308928
Ground machine defense research limit
Network point percentage
00888889
SNOO22R8R0
5300002398298439222229
##O00002##R2####RRRRR##
3933189302923
230052
13230398302923090
2009900
6000000828888889
138822
18888888
Yu Dao Yu:
8888885888
388888888888888
the #of the #
your #of the #
percentage of outlets
Note: The location data is for reference only.
Table 2 (continued)
Dot-to-point ratio
GB/T20439—2006/IS0 126421996 Sample
Dot-to-point ratio19963888883833888888883828883888888282388888812388888338888388388383223323882black
88388888888
point percentage
noaoan
30080000040n3aS88838935338822223335506000000300022333890 5e78e283888889
Four public medical supervision you
China has limited public
and the kidney
Hufa travel has travel drug dealers medical travel equipment service limit
Wuhan Han Han Han Ji Li Xin area measurement limit and model situation visit data Pega travel
88287332838888222333243223339888833229322223982282
3885238338238888882||t t||Network Percentage
2 (Continued)
38333388882282282
388883889
8288888800600
#City Sign
A89RS0
Electric 82288
389898984999
333500
China Investment Medical Insurance Co., Ltd.
303426| |tt||999988288899999422
Local limit
00000038388233382822888382223323882823522882288552398832223238929883
Outlets in batches
00070000
1000003000000090000000889938HO3R923023 9R203890
535000322288
999888899988
1838989
133828225588903782
Wu Ke equipped with activities joint research certification research and development limited defense science active city construction new sea science 559889399868558
intelligent design sales supply public maintenance has a social program service has a public service city public lock sales security lock service committee service standardization program social service standard security machine security machine information tax standard Make good silver insurance plate 1482
GB/T204392006/15012642:1996
Percentage of network points
200920
123882882222882288
Public-public cooperation limit code limit training limit
Mai 2 (continued)
Percentage of network points
Electric 30008622222
30000088228
3030 952222708
308928
ground machine defense research limit
point percentage
00888889
SNOO22R8R0
5300002398298439222229
##O00002##R2####RRRRR##
3933189302923
230052
1323039 8302923090
2009900
6000000828888889
138822
18888888
Yudaoyu:
8888885888
388888888888888
####
Your###
Dot percentage
Note: The position data is for reference only.
Table 2 (continued)
Dot percentage
GB/T20439—2006/IS0 126421996 sample
Dot percentage19963888883833888888883828883888888282388888812388888338888388388383223323882black
88388888888
point percentage
noaoan
30080000040n3aS88838935338822223335506000000300022333890 5e78e283888889
Four public medical supervision you
China has limited public
and the kidney
Hufa travel has travel drug dealers medical travel equipment service limit
Wuhan Han Han Han Ji Li Xin area measurement limit and model situation visit data Pega travel
88287332838888222333243223339888833229322223982282
3885238338238888882||t t||Network Percentage
2 (Continued)
38333388882282282
388883889
8288888800600
#City Sign
A89RS0
Electric 82288
389898984999
333500
China Investment Medical Insurance Co., Ltd.
303426| |tt||999988288899999422
Local limit
00000038388233382822888382223323882823522882288552398832223238929883
Outlets in batches
00070000
1000003000000090000000889938HO3R923023 9R203890
535000322288
999888899988
1838989
133828225588903782
Wu Ke equipped with activities joint research certification research and development limited defense science active city construction new sea science 559889399868558
intelligent design sales supply public maintenance has a social program service has a public service city public lock sales security lock service committee service standardization program social service standard security machine security machine information tax standard Make good silver insurance plate 1482
GB/T204392006/15012642:1996
Percentage of network points
200920
123882882222882288
Public-public cooperation limit code limit training limit
Mai 2 (continued)
Percentage of network points
Electric 30008622222
30000088228
3030 952222708
308928
ground machine defense research limit
point percentage
00888889
SNOO22R8R0
5300002398298439222229
##O00002##R2####RRRRR##
3933189302923
230052
1323039 8302923090
2009900
6000000828888889
138822
18888888
Yudaoyu:
8888885888
388888888888888
####
Your###
Dot percentage
Note: The position data is for reference only.
Table 2 (continued)
Dot percentage
GB/T20439—2006/IS0 126421996 sample
Dot percentage
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