This standard specifies the parameters that define printing conditions in various printing methods. The values ​​of the parameters specified can be used to exchange data to specify printing conditions, or to control the printing process by technicians to achieve the expected operation goals. This standard defines terms and establishes a minimum set of process parameters that specifically determine the visual effects of four-color halftone images of printed products. They are determined according to the process steps of "color separation", "print production", "proofing", and "surface finishing" of printing methods based on color separation films. This standard applies to - proofing and printing processes based on color separation films; - proofing and printing without film reproduction, and gravure printing similar to film production systems; - printing with more than four colors similar to the principle of four-color printing; - line screens and halftone printing without a certain screen angle and screen line count. GB/T 17934.1-1999 Printing Technology Process Control of Halftone Color Separation Films, Samples and Printed Products Part 1: Parameters and Test Methods GB/T17934.1-1999 Standard Download Decompression Password: www.bzxz.net
This standard specifies the parameters that define printing conditions in various printing methods. The values ​​of the specified parameters can be used to set preset printing conditions during data exchange, or to control the printing process by technicians to achieve the expected operation goals. This standard defines terms and establishes a minimum set of process parameters that specifically determine the visual effects of four-color halftone images of printed products. They are determined according to the process steps of "color separation", "print production", "proofing", and "surface finishing" of printing methods based on color separation films. This standard applies to: - proofing and printing processes based on color separation films; - proofing and printing without film reproduction, and gravure printing similar to film production systems; - printing with more than four colors similar to the principle of four-color printing; - line screen and halftone printing without a certain screen angle and screen line count.

CB/T17934.1—1999
This standard is equivalent to ISO12647-1:1996 Printing Technology—Process Control of Halftone Color Separation Sheets, Samples and Printed Products—Part 1: Parameters and Test Methods. At present, ISO12647 consists of two parts, Part 1 is "Parameters and Test Methods" and Part 2 is "Offset Printing".
Since the content of this standard is parameters and test methods, in order to keep pace with international standards, except for some necessary processing in the text, the definition and test methods of parameters are completely consistent with ISO 12647-1. This standard specifies the parameters that must be understood and mastered to control the printing process and ensure accurate reproduction, and gives their definitions and technical requirements. In order to make the measurement data objective and referenceable, this standard also specifies the test method. The reference standard ISO 5-4 Photography—Density Measurement—Part 1 in the original international standard is used to refer to the parameters that must be understood and mastered to ensure accurate reproduction. Part: Geometric conditions for density measurement & has not yet been converted into Chinese standards. For ease of use, we have collected the relevant parts of this international standard in Appendix B. It is used as an appendix to the standard. The original standard Appendix B is changed to an appendix. Appendix A and Appendix B are appendices to the standard. Appendix C is a reminder appendix. This standard is proposed by the Press and Publication Administration of the People's Republic of China. This standard is under the jurisdiction of the National Printing Standardization Technical Committee. The drafting unit of this standard: China Printing Science and Technology Research Institute. The main drafters of this standard: Li Jiaxiang, Zhang Hong, Wei Xin. GB/T 17934. 1—1999
ISO Foreword
1ISO (International Organization for Standardization) is a worldwide specialized standardization organization composed of national standardization groups (ISO member countries). The work of formulating international standards is usually completed by ISO's technical committees. If each member group is interested in a standard project established by a technical committee, it has the right to participate in the work of the committee. International organizations (official or unofficial) that maintain contact with ISO can also participate in the relevant work. In the field of electrical technology standardization, ISO maintains a close cooperative relationship with the International Electrical Commission (IEC): The draft international standard proposed by the technical committee is submitted to the member groups for voting. The international standard needs to be approved by at least 75% of the member groups voting to be formally adopted. International Standard IS12647-1 was developed by ISO/TC130 Printing Technical Committee. The full name of ISO12647 standard is Printing Technology - Process Control of Halftone Separations, Samples and Printed Products. It currently consists of the following parts: Part 1, Parameters and Test Methods Part 2 Amine Printing Annex A and Appendix 13 of this standard are standard appendices, and Appendix C is a suggestive appendix. GB/T17934.1-1999 When producing halftone color reproductions, it is very important for the color separation personnel, proofing personnel and printing personnel to predetermine a minimum set of parameters that specifically determine the visual effects and other technical performance of proofing and printing. This provision enables the correct production of qualified color separations (without repeated testing) and the effective implementation of post-processing such as non-press proofing and press proofing with the purpose of simulating the visual effect of the final printed product as realistically as possible. The purpose of Part 1 of this standard is to list and explain a minimum set of process parameters to be used, which are necessary to determine the visual effect of a halftone proof or printed product produced from a set of halftone color separations. For certain printing methods, some parameters are more important than others, and these parameters can be divided into mandatory and non-mandatory parameters, but in Part 1 of this standard, all parameters are treated equally, and it is necessary to distinguish between direct parameters and indirect parameters. In Part 1 of this standard, only direct parameters are described. Direct parameters are parameters that directly affect the visual effect of the image, and indirect parameters are parameters that indirectly affect the visual effect of the image by changing the value of the direct parameter. Indirect parameters include:
————color separation film thickness;
————image front and back
——negative or positive image;
——unevenness of the surface of the optical emulsion;
——presence or absence of color mark or registration mark. In the color separation process of multi-color halftone printing: halftone color separation films are usually produced from color continuous tone originals, which generally have transmission originals and reflection originals, which can be analog originals or digital originals. The color separation process is not to directly convert the color value of the original into the color of the printed product. For each recognizable point in the original, its color (represented by the three stimulus values ​​XY, Z or L\, α', 6 or hue, saturation and brightness) must be converted into four or more tone values ​​(dot area) on the color separation film. However, in most cases, the density range of the original is wider than the density range that can be obtained in printing production. Therefore, the color separation personnel need to analyze and judge the original manuscript, and the final conversion result may be different from the original manuscript. There are many possible flexibility in the color separation process, so it is very important to take into account the process parameter values ​​of the production printing press. The processes after color separation, namely proofing (non-printing machine proofing or printing machine proofing), plate exposure (for printing machine proofing and production printing), printing and surface finishing of printed products, are generally carried out with the help of a set of strict process parameters. These parameters include: - first-order tone value increase curve,
, optical properties of printing ink and ink film thickness; - substrate properties.
It is very important to keep the parameters stable in all processes. Any unexpected changes in process parameters will affect the visual effect of the image.
The above discussion shows that both color separation and proofing processes need to understand the values ​​of the process parameters used in printing production. Because, without considering the properties of the printing press, printing plate and substrate, it is not possible to print all printed products with the same set of process parameters. Therefore, it is necessary to establish effective information transfer between the color separation personnel, the proofing personnel and the production printing personnel who determine the parameters specific to a job. In order to facilitate information conversion, Part 1 of this standard specifies the integers that should be specified for the color separation sheets with the print proofs when accepting jobs. Part 1 of this standard does not specify the values ​​of each parameter, but only gives the parameter definitions and test methods. Since color proofs are the main information carrier between the pre-press process and the printing process, it is important to produce the print proofs in a way that can be realized and can simulate the best preset printing parameters, and to produce the prints as close as possible to the visual effect of the approved print proofs. One of the important variables in the printing process is the tone value increase curve (or dot gain curve), as shown in Figure !. Such a curve with appropriate errors can represent the printing primaries for various specific printing substrates and printing methods. National Standard of the People's Republic of China
Printing Technology Network Process Control of Self-adjusting Colour Separations, Proof and Production Prints
Part 1: Parameters and Test Methods
Graphic lechaulogy--Pruess tontrol fer the manufacture of half-tone colour separations ,proof and production prints--Part 1:Parameters and measurement methods1Scope
GB/T17934.11999
EQY 10 12647-1:1996
This standard specifies the parameters that define the printing conditions in various formats. The values ​​of the specified parameters can be used to characterize the preset printing conditions when exchanging data, or to control the printing process by the technician to achieve the expected operation. This standard defines terms and establishes a minimum set of process parameters specifically for determining the visual effect of four-color halftone images of printed products, which are determined according to the process steps of "color separation", "plate making", "proofing", "printing" and "surface finishing" based on color separation films.
Who is this standard applicable to!
·Proofing and printing processes based on color separation films: - proofing and printing without film reproduction, and gravure printing similar to film production systems; - and four-color printing The principle is similar to that of printing with more than four colors; line tea screens and those self-adjusting screens without a certain screen angle and screen line number. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard: When this standard is published, the versions shown are valid. All standards will be subscribed, and the parties using this standard should discuss the possibility of using the latest version of the following standards. GB/TI1500-1939 Geometric conditions for measurement of transmission density GB1501-:1989 Photographic Densitometer Conditions for Photographic Densitometers JS013655:1996 Spectral Measurement and Colorimetric Calculation of Prepress Images: This international standard can be found at the China Printing Standardization Technical Committee. 3 Definitions
This standard adopts the following definitions. The definitions in this standard are arranged in alphabetical order. Note 1: The units used in the definitions are given above. The units without exception are 1 3.1 CIE I.AH Color difference (A) CIELAB coiour differcnce: CIF 1976 L*.ab colour difference is the color difference between two points in the color space that conforms to the Euclidean distance definition. 3.2 CIE I.A color space CIELAB colour space is a two-dimensional approximately uniform color space formed by plotting in a rectangular coordinate system. 3.3 Frine width (referring to a single opaque image element) frinewidth approved by the State Administration of Quality and Technical Supervision on December 30, 1999 and implemented on August 1, 2000 CB/T 17934. 11999 The average distance between the density contour lines of 10% and 90% of the center density of the small dots Unit: m 3.4 Surface finishing surface finishing a process of coating with a glazing agent or laminating a printed matter with a transparent film layer. 3.5 Chromatic, colour a color with hue in vision. Note 4: Printing primary colors cyan, magenta and yellow are based on color oils. 3.6 Sampling aperture size sampling aperture size The size of the sample surface area for measuring reflection, transmission coefficient or density, which is determined by the design of the measuring instrument. 3.7 olstip
A collection of control blocks arranged in one dimension.
3.B print substrate
The carrier that carries the printed image.
3.9 reflectometer
A photometer that measures physical quantities related to reflection. 3.10 reflection densityreflectance factar densityThe logarithm of the reciprocal of the reflectance coefficient R with 10 as the base. 3.11 reflection densitometerAn instrument that measures the reflection density of a disk.
3- 12 reflection factor (R)reflectance factor (R)The ratio of the reflected light flux measured from the printed sample to the reflected light flux measured from the ideal reflector at the same position. 3.13 achromatic color
Color without hue in vision,
2 achromatic color - refers to black, white,. For materials that are not exposed to light, the term "colorless" or "neutral" is also used to describe them. 3 In printing practice, shadowless colors can be produced by a single amount of oil or by the most appropriate balance of three color oils. 3.14 Off-press print proof Prin: A printed product produced by other methods other than printing press printing. Its function is to show the color separation effect in a way that accurately simulates the effect of the printing press.
Note 11, also called "pre-press proof". 3.15 Colour separation film A set of white and black halftone films used for three-color printing, each film corresponding to a printing primary color. Note 6: Usually, there are four such films in a set of colour separation films (corresponding to yellow, magenta, cyan, and phototype). 3.16 OK print, OK sheet In the printing production process, the printed product selected as a reference sample for the subsequent printing job. 3.17 Grey balance
If a printed product produced under specified printing conditions appears grey under specified measuring conditions, the cyan, magenta and yellow tone values ​​(dot areas) on the color separation film are in a grey balance state. 3.18 Film Positive and Negative Film: Films whose blank areas and solid areas correspond to the non-printed areas and printed areas on the printed product respectively are called positive films; films whose blank areas and solid areas correspond to the printed areas and non-printed areas on the printed product respectively are called negative films. 3.19 Film emulsion orientation The orientation of the color separation film emulsion relative to the observer. Note 7: The standard orientation is the emulsion side facing up, i.e. facing the observer. WGB/T17934.1—1999
3.20 Tune value increase (dot gain) tunevalueincrease:dotgain The difference between the tone value on the printed product and the tone value on the corresponding color separation film. Use the self-value to indicate the loss, note 16, synonym "dot gain" only applies to the halftone image formed by the halftone pattern: 3.21 tonc value sum
the sum of the tone values ​​of four color separations,
also called "total dot area" (DTA)
1 For large-scale color separations, the maximum sum of the tone values ​​is the dark part of the image: 3.22 control block control pth
reference block made for control or measurement.
3.23 moire pattern moire pattern Unwanted periodic pattern structure produced by the interaction between two-dimensional or multi-dimensional periodic structures. 3.24 deviation tolerance
The allowable difference between the printed sample and the standard value. 3-25 Colorimeter colarirneter
Instrument for measuring chromaticity.
Standard 5: Photoelectric colorimeter measures the three stimulus values ​​by simulating the product of the reflection and transmission coefficients of the measured object, the standard light source and the color filter specified by the standard field of view. Spectrophotometer measures according to the spectral data. 3.26 Transmission density transmission density is the transmission coefficient T with a base of 10 The logarithm of the reciprocal. 3.27 Transmission densitometer An instrument that measures transmission density.
3.28 Transmission factor (T) The ratio of the luminous flux through the measuring aperture covered by the sample to the luminous flux through the measuring aperture not covered by the sample. 3.29 Image orientation If the text is in the normal reading state and the image is in the direction of viewing by the end user, the image content is said to be normal reading (otherwise it is "reverse reading").
8 The orientation of the emulsion side of the film should be indicated as "emulsion side up" or "emulsion side down". If no indication is given, it is considered to be "emulsion side up". In general, the meaning of "normal emulsion side down" and "emulsion side up" alternate. 3.30 Image orientation The horizontal direction of viewing by the end user.
3.31 Axis of dot arrangement scrccnThe direction of the two directions of dot arrangement that presents the highest number of image elements (such as dots or lines) per unit length. 3.32 Screen-tone film
Film with dot or line images used in screen-tone printing. 3.33 Screen angle scrcen angle
For rectangular dots, it is the angle between the axis of dot arrangement and the image base. For circular or square dots, it is the smallest dead angle between the first direction of dot arrangement and the base direction. Unit (\). 3.34 Screen width srrcenwidth
The reciprocal of the screen count, in cm.
3.35 Screen ruling (screen frequency) screen rulingiscreenfrequnnyThe number of image elements such as dots or lines per unit length in the direction of their maximum value, in cm-\ (dots per centimeter). 3.36 Relative density rrlalivedensity
GB/T 17934. 1-- 1999
Density value after subtracting the density of the base or unprinted substrate: Unit: 13-37 Tone value of half tone film (dot-by-dot, A) t.one value on a half tone film of positive polatity(dorarea.A)
A is given by the following formula:
A(%) = 100 x [[- 10-P-,]/[1 - 10-i, ]wherein; D, - transmission density of transparent halftone film; 1) - transmission density of solid area;
1), - transmission density of dot
3.38 tone value of negative-tone film (dot area, A)
is given by the following formula:
A(%) = 100 - 100 × [1 - 10 -%1//1 ::10-,-wherein: W. 1. Transmittance of transparent halftone film: 1) - the transmittance density of the solid area; 2) - the reflective density of the dots, 3. 39 Printing plate: a printing plate whose surface is treated so that one part can transfer printing ink and the other part cannot. 3. 40 Tone value of a print (dot area, A) The percentage of the surface area covered by a single color ink on a halftone print (if light diffusion or other optical phenomena on the substrate can be ignored) A, is calculated by the following formula: 21 (%) = 100 × E1 - 10-(0-0g]/[1 - 10 m -m Where: 1) - the reflective density of the unprinted substrate or the non-printed part of the printing plate: D. Reflectivity of solid ink: 2) - the reflective density of the halftone area. NOTE
13 Also called "equivalent dot area" or "total dot area". The synonym "dot area" applies only to images composed of dots. This definition may be used to provide proof values ​​for certain printing plates. 3.41 on press print a print produced by a printing press (production press or proofing machine). Its purpose is to show the separation effect in a way that accurately simulates the effect of a printing press.
3.42 process colours (for four-colour printing)
yellow, magenta, cyan and black:
3.43 hard dot film:
color separation film with dots that can be reliably reproduced during film copying and plate making. 3.44 Tolerance variation tolerance The permissible error between a printed sample and a sample randomly taken from the production process: 3.45 Mil-tone pread (S) S is expressed as a white fraction and is determined by the following formula: S = max. (A1 - A1), (A1 - A1). (A1 - A1), (A1 - A1), (A1 - A1)] Where: . - measured tone value of cyan primary color image, A - specified tone value of primary color image; A. - measured tone value of magenta primary color image:
CB/T17934.1-1999
Am - specified tone value of magenta primary color image; A - measured tone value of yellow primary color image
A - specified tone value of yellow primary color image. Note 1a: Example: Measured value (,m-2) - (22-17,20) Specified value (cgmy) - (20.20.18) m8x: (22—20). (17-26), (2- 18)2min[(22- 20), (1720). (20-18)_ -- -3S=[max mitj-5
3.46 Center density (on screen printing) care dcnsity The transmission density at the center of a single opaque image element (such as a dot or line), 3.47 Principal axis
The axis of a dot row that is aligned with the longest diameter of an elongated dot (such as an elliptical or differential dot), Note 12: Square and square dots have no principal axis, 4 Technical requirements
The following clauses provide the characteristics and basic parameters of the visual effects and other technical aspects of specially screen printed products. Where necessary, measurement methods and recommended values ​​are given. NOTE 19: The information provided above about characteristics and basic parameters is very important for mutual communication during the screen adjustment process. In actual work, many parameters can be determined to have analytical values, so it is not necessary to specify each parameter explicitly. Such values ​​are specified in other parts of this standard. 4. Separations
4.1.7 Quality
The minimum dot center density and maximum dot edge width of the final separations should be determined: Note 20: Refer to Appendix C.4..2 Screen count
The screen count of each set of separations should be given in centimeters (m-). If the set of separations has more than one screen count, then each separation should be described separately or the specific screen count of the set should be clearly reported. Note
21 Coarse-grained substrates require a higher screen quality than smooth coated substrates, and their tone value range is limited, and the dot increase is too excessive. 22 The screen count of black-and-white images can be finer than that of color images. For example: 80rm-1 screen for black-and-white images and 62em-1 for color images. 23 See 4.1.3 25\, 4.1.3 Screen Angle
The screen angle of each color plate should be determined.
The measurement method should be as specified in 5.: The reporting method should be as specified in A1. Note
24 Please note that the standard screen angles of black, cyan and magenta differ by 30° from each other and by 15° from cyan or black. The main axis of the screen of the main color is 45° to the main direction. 25 When adding screens by computer, the parameters of "screen number" and "screen angle" of each color plate can be set. 4. 1.4 Dot shape and its relationship with tone value The shape of the dot and its relationship with tone value should be determined within the entire tone value range: the shape of the midtone dot should be determined (such as: round, square, elliptical). When using a screen with a main axis, the tone value of the first and second connection of the dot should be determined. The tone value measurement method should be in accordance with the provisions of 5.2; the reporting method should be in accordance with the provisions of A2. 4.1.5 Image size error
The maximum size error between any two color separations in the set of color separations is determined by the percentage of the image diagonal. The measurement method is: first, align the four color separations together along the upper left corner, then measure the maximum size difference in the lower right corner and express it as a percentage of the diagonal.
4.1.6 Tone value (dot area) totalbzxZ.net
GB/T 17934. 1—1999
The total tonal value of the darkest non-color portion of the image shall be determined. If necessary, it is preferred to determine the tonal value of the black plate image separately. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. 4.1.7 Gray balance
The magenta and yellow tonal values ​​that produce a neutral color with a certain tonal value (usually 50) shall be determined: these tonal values ​​may also be determined in three additional groups. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. NOTE 26: Gray balance is determined by the cyan, magenta, and yellow tonal values ​​of the image, their subcolors, and the colors of the overprints. 4.2 Printed products
4.2.1 Visual characteristics of image portions
4.2.1.1 Substrate color
The CIELAB color space values ​​(L-, a\, b') and the color difference values ​​(AE) of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the gloss tolerance of the substrate that has been finished but not printed shall also be determined. The measurement method shall be as specified in 5.6 and the reporting method shall be as specified in A5.
4.2.1.2 Glossiness of printed matter
The glossiness and tolerance of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the glossiness of the substrate that has been finished but not printed shall also be specified. The measurement method shall be as specified in 5.5 and the reporting method shall be as specified in A5. 4.2.1.3 Color of ink
The (IELAB color space value) of the solid printed matter for each of the four primary colors shall be determinedA)
is given by the following formula:
A(%) = 100 - 100 × [1 - 10 -%1//1 ::10-,-wherein: W. - Transmittance density of transparent halftone film:
I) - Transmittance density of solid area;
I) - Selective density of halftone dots,
3. 39 Printing fornt?
A printing plate whose surface is treated to transfer printing ink in one part and not in the other. 3.40 Tone value of a print (dot area, A) The percentage of the surface area covered by a single color ink on a halftone print (if light diffusion or other optical phenomena on the substrate can be neglected) A, is calculated by the following formula: 21 (%) = 100 × E1 - 10-(0-0g]/[1 - 10 m -m Where: 1) --- Reflection density of the unprinted substrate or the non-printed part of the plate: D. Reflection density of the solid ink:
D), the reflection density of the halftone area. Note:
13 Also called "equivalent dot area" or "total dot area". 1 The synonym "dot area" only applies to halftone images composed of dots. 1 This definition can be used to provide certain tone values ​​for printing plates. 3.41 on press printout a printed product produced by a printing press (production press or proofing machine). Its purpose is to show the effect of separation in a way that accurately simulates the effect of a printing press.
3.42 process colors (for four-color printing) process coluurs
yellow, magenta, cyan and black:
3.43 hard dot film: harddot film
color separation film with dots that can be reliably reproduced during film copying and plate making. 3.44 Tolerance variation tolerance The permissible error between a printed sample and a sample randomly taken from the production process: 3.45 Mil-tone pread (S) S is expressed as a white fraction and is determined by the following formula: S = max. (A1 - A1), (A1 - A1). (A1 - A1), (A1 - A1), (A1 - A1)] Where: . - measured tone value of cyan primary color image, A - specified tone value of primary color image; A. - measured tone value of magenta primary color image:
CB/T17934.1-1999
Am - specified tone value of magenta primary color image; A - measured tone value of yellow primary color image
A - specified tone value of yellow primary color image. Note 1a: Example: Measured value (,m-2) - (22-17,20) Specified value (cgmy) - (20.20.18) m8x: (22—20). (17-26), (2- 18)2min[(22- 20), (1720). (20-18)_ -- -3S=[max mitj-5
3.46 Center density (on screen printing) care dcnsity The transmission density at the center of a single opaque image element (such as a dot or line), 3.47 Principal axis
The axis of a dot row that is aligned with the longest diameter of an elongated dot (such as an elliptical or differential dot), Note 12: Square and square dots have no principal axis, 4 Technical requirements
The following clauses provide the characteristics and basic parameters of the visual effects and other technical aspects of specially screen printed products. Where necessary, measurement methods and recommended values ​​are given. NOTE 19: The information provided above about characteristics and basic parameters is very important for mutual communication during the screen adjustment process. In actual work, many parameters can be determined to have analytical values, so it is not necessary to specify each parameter explicitly. Such values ​​are specified in other parts of this standard. 4. Separations
4.1.7 Quality
The minimum dot center density and maximum dot edge width of the final separations should be determined: Note 20: Refer to Appendix C.4..2 Screen count
The screen count of each set of separations should be given in centimeters (m-). If the set of separations has more than one screen count, then each separation should be described separately or the specific screen count of the set should be clearly reported. Note
21 Coarse-grained substrates require a higher screen quality than smooth coated substrates, and their tone value range is limited, and the dot increase is too excessive. 22 The screen count of black-and-white images can be finer than that of color images. For example: 80rm-1 screen for black-and-white images and 62em-1 for color images. 23 See 4.1.3 25\, 4.1.3 Screen Angle
The screen angle of each color plate should be determined.
The measurement method should be as specified in 5.: The reporting method should be as specified in A1. Note
24 Please note that the standard screen angles of black, cyan and magenta differ by 30° from each other and by 15° from cyan or black. The main axis of the screen of the main color is 45° to the main direction. 25 When adding screens by computer, the parameters of "screen number" and "screen angle" of each color plate can be set. 4. 1.4 Dot shape and its relationship with tone value The shape of the dot and its relationship with tone value should be determined within the entire tone value range: the shape of the midtone dot should be determined (such as: round, square, elliptical). When using a screen with a main axis, the tone value of the first and second connection of the dot should be determined. The tone value measurement method should be in accordance with the provisions of 5.2; the reporting method should be in accordance with the provisions of A2. 4.1.5 Image size error
The maximum size error between any two color separations in the set of color separations is determined by the percentage of the image diagonal. The measurement method is: first, align the four color separations together along the upper left corner, then measure the maximum size difference in the lower right corner and express it as a percentage of the diagonal.
4.1.6 Tone value (dot area) total
GB/T 17934. 1—1999
The total tonal value of the darkest non-color portion of the image shall be determined. If necessary, it is preferred to determine the tonal value of the black plate image separately. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. 4.1.7 Gray balance
The magenta and yellow tonal values ​​that produce a neutral color with a certain tonal value (usually 50) shall be determined: these tonal values ​​may also be determined in three additional groups. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. NOTE 26: Gray balance is determined by the cyan, magenta, and yellow tonal values ​​of the image, their subcolors, and the colors of the overprints. 4.2 Printed products
4.2.1 Visual characteristics of image portions
4.2.1.1 Substrate color
The CIELAB color space values ​​(L-, a\, b') and the color difference values ​​(AE) of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the gloss tolerance of the substrate that has been finished but not printed shall also be determined. The measurement method shall be as specified in 5.6 and the reporting method shall be as specified in A5.
4.2.1.2 Glossiness of printed matter
The glossiness and tolerance of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the glossiness of the substrate that has been finished but not printed shall also be specified. The measurement method shall be as specified in 5.5 and the reporting method shall be as specified in A5. 4.2.1.3 Color of ink
The (IELAB color space value) of the solid printed matter for each of the four primary colors shall be determinedA)
is given by the following formula:
A(%) = 100 - 100 × [1 - 10 -%1//1 ::10-,-wherein: W. - Transmittance density of transparent halftone film:
I) - Transmittance density of solid area;
I) - Selective density of halftone dots,
3. 39 Printing fornt?
A printing plate whose surface is treated to transfer printing ink in one part and not in the other. 3.40 Tone value of a print (dot area, A) The percentage of the surface area covered by a single color ink on a halftone print (if light diffusion or other optical phenomena on the substrate can be neglected) A, is calculated by the following formula: 21 (%) = 100 × E1 - 10-(0-0g]/[1 - 10 m -m Where: 1) --- Reflection density of the unprinted substrate or the non-printed part of the plate: D. Reflection density of the solid ink:
D), the reflection density of the halftone area. Note:
13 Also called "equivalent dot area" or "total dot area". 1 The synonym "dot area" only applies to halftone images composed of dots. 1 This definition can be used to provide certain tone values ​​for printing plates. 3.41 on press printout a printed product produced by a printing press (production press or proofing machine). Its purpose is to show the effect of separation in a way that accurately simulates the effect of a printing press.
3.42 process colors (for four-color printing) process coluurs
yellow, magenta, cyan and black:
3.43 hard dot film: harddot film
color separation film with dots that can be reliably reproduced during film copying and plate making. 3.44 Tolerance variation tolerance The permissible error between a printed sample and a sample randomly taken from the production process: 3.45 Mil-tone pread (S) S is expressed as a white fraction and is determined by the following formula: S = max. (A1 - A1), (A1 - A1). (A1 - A1), (A1 - A1), (A1 - A1)] Where: . - measured tone value of cyan primary color image, A - specified tone value of primary color image; A. - measured tone value of magenta primary color image:
CB/T17934.1-1999
Am - specified tone value of magenta primary color image; A - measured tone value of yellow primary color image
A - specified tone value of yellow primary color image. Note 1a: Example: Measured value (,m-2) - (22-17,20) Specified value (cgmy) - (20.20.18) m8x: (22—20). (17-26), (2- 18)2min[(22- 20), (1720). (20-18)_ -- -3S=[max mitj-5
3.46 Center density (on screen printing) care dcnsity The transmission density at the center of a single opaque image element (such as a dot or line), 3.47 Principal axis
The axis of a dot row that is aligned with the longest diameter of an elongated dot (such as an elliptical or differential dot), Note 12: Square and square dots have no principal axis, 4 Technical requirements
The following clauses provide the characteristics and basic parameters of the visual effects and other technical aspects of specially screen printed products. Where necessary, measurement methods and recommended values ​​are given. NOTE 19: The information provided above about characteristics and basic parameters is very important for mutual communication during the screen adjustment process. In actual work, many parameters can be determined to have analytical values, so it is not necessary to specify each parameter explicitly. Such values ​​are specified in other parts of this standard. 4. Separations
4.1.7 Quality
The minimum dot center density and maximum dot edge width of the final separations should be determined: Note 20: Refer to Appendix C.4..2 Screen count
The screen count of each set of separations should be given in centimeters (m-). If the set of separations has more than one screen count, then each separation should be described separately or the specific screen count of the set should be clearly reported. Note
21 Coarse-grained substrates require a higher screen quality than smooth coated substrates, and their tone value range is limited, and the dot increase is too excessive. 22 The screen count of black-and-white images can be finer than that of color images. For example: 80rm-1 screen for black-and-white images and 62em-1 for color images. 23 See 4.1.3 25\, 4.1.3 Screen Angle
The screen angle of each color plate should be determined.
The measurement method should be as specified in 5.: The reporting method should be as specified in A1. Note
24 Please note that the standard screen angles of black, cyan and magenta differ by 30° from each other and by 15° from cyan or black. The main axis of the screen of the main color is 45° to the main direction. 25 When adding screens by computer, the parameters of "screen number" and "screen angle" of each color plate can be set. 4. 1.4 Dot shape and its relationship with tone value The shape of the dot and its relationship with tone value should be determined within the entire tone value range: the shape of the midtone dot should be determined (such as: round, square, elliptical). When using a screen with a main axis, the tone value of the first and second connection of the dot should be determined. The tone value measurement method should be in accordance with the provisions of 5.2; the reporting method should be in accordance with the provisions of A2. 4.1.5 Image size error
The maximum size error between any two color separations in the set of color separations is determined by the percentage of the image diagonal. The measurement method is: first, align the four color separations together along the upper left corner, then measure the maximum size difference in the lower right corner and express it as a percentage of the diagonal.
4.1.6 Tone value (dot area) total
GB/T 17934. 1—1999
The total tonal value of the darkest non-color portion of the image shall be determined. If necessary, it is preferred to determine the tonal value of the black plate image separately. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. 4.1.7 Gray balance
The magenta and yellow tonal values ​​that produce a neutral color with a certain tonal value (usually 50) shall be determined: these tonal values ​​may also be determined in three additional groups. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. NOTE 26: Gray balance is determined by the cyan, magenta, and yellow tonal values ​​of the image, their subcolors, and the colors of the overprints. 4.2 Printed products
4.2.1 Visual characteristics of image portions
4.2.1.1 Substrate color
The CIELAB color space values ​​(L-, a\, b') and the color difference values ​​(AE) of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the gloss tolerance of the substrate that has been finished but not printed shall also be determined. The measurement method shall be as specified in 5.6 and the reporting method shall be as specified in A5.
4.2.1.2 Glossiness of printed matter
The glossiness and tolerance of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the glossiness of the substrate that has been finished but not printed shall also be specified. The measurement method shall be as specified in 5.5 and the reporting method shall be as specified in A5. 4.2.1.3 Color of ink
The (IELAB color space value) of the solid printed matter for each of the four primary colors shall be determinedReflectivity of solid ink:
D), the reflective density of a halftone area. NOTE
13 Also called "equivalent dot area" or "full dot area". The synonym "dot area" applies only to halftone images composed of dots. This definition can be used to provide proof of tone values ​​for certain printing plates. 3.41 Printing press print A print produced by a printing press (production press or proofing machine). Its purpose is to show the separation effect in a way that accurately simulates the effect of a printing press.
3.42 Process colors (for four-color printing)
yellow, magenta, cyan and black:
3.43 Hard dot film:
Color separation film with dots that can be reliably reproduced during film copying and plate making. 3.44 Tolerance variation tolerance The permissible error between a printed sample and a sample randomly taken from the production process: 3.45 Mil-tone pread (S) S is expressed as a white fraction and is determined by the following formula: S = max. (A1 - A1), (A1 - A1). (A1 - A1), (A1 - A1), (A1 - A1)] Where: . - measured tone value of cyan primary color image, A - specified tone value of primary color image; A. - measured tone value of magenta primary color image:
CB/T17934.1-1999
Am - specified tone value of magenta primary color image; A - measured tone value of yellow primary color image
A - specified tone value of yellow primary color image. Note 1a: Example: Measured value (,m-2) - (22-17,20) Specified value (cgmy) - (20.20.18) m8x: (22—20). (17-26), (2- 18)2min[(22- 20), (1720). (20-18)_ -- -3S=[max mitj-5
3.46 Center density (on screen printing) care dcnsity The transmission density at the center of a single opaque image element (such as a dot or line), 3.47 Principal axis
The axis of a dot row that is aligned with the longest diameter of an elongated dot (such as an elliptical or differential dot), Note 12: Square and square dots have no principal axis, 4 Technical requirements
The following clauses provide the characteristics and basic parameters of the visual effects and other technical aspects of specially screen printed products. Where necessary, measurement methods and recommended values ​​are given. NOTE 19: The information provided above about characteristics and basic parameters is very important for mutual communication during the screen adjustment process. In actual work, many parameters can be determined to have analytical values, so it is not necessary to specify each parameter explicitly. Such values ​​are specified in other parts of this standard. 4. Separations
4.1.7 Quality
The minimum dot center density and maximum dot edge width of the final separations should be determined: Note 20: Refer to Appendix C.4..2 Screen count
The screen count of each set of separations should be given in centimeters (m-). If the set of separations has more than one screen count, then each separation should be described separately or the specific screen count of the set should be clearly reported. Note
21 Coarse-grained substrates require a higher screen quality than smooth coated substrates, and their tone value range is limited, and the dot increase is too excessive. 22 The screen count of black-and-white images can be finer than that of color images. For example: 80rm-1 screen for black-and-white images and 62em-1 for color images. 23 See 4.1.3 25\, 4.1.3 Screen Angle
The screen angle of each color plate should be determined.
The measurement method should be as specified in 5.: The reporting method should be as specified in A1. Note
24 Please note that the standard screen angles of black, cyan and magenta differ by 30° from each other and by 15° from cyan or black. The main axis of the screen of the main color is 45° to the main direction. 25 When adding screens by computer, the parameters of "screen number" and "screen angle" of each color plate can be set. 4. 1.4 Dot shape and its relationship with tone value The shape of the dot and its relationship with tone value should be determined within the entire tone value range: the shape of the midtone dot should be determined (such as: round, square, elliptical). When using a screen with a main axis, the tone value of the first and second connection of the dot should be determined. The tone value measurement method should be in accordance with the provisions of 5.2; the reporting method should be in accordance with the provisions of A2. 4.1.5 Image size error
The maximum size error between any two color separations in the set of color separations is determined by the percentage of the image diagonal. The measurement method is: first, align the four color separations together along the upper left corner, then measure the maximum size difference in the lower right corner and express it as a percentage of the diagonal.
4.1.6 Tone value (dot area) total
GB/T 17934. 1—1999
The total tonal value of the darkest non-color portion of the image shall be determined. If necessary, it is preferred to determine the tonal value of the black plate image separately. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. 4.1.7 Gray balance
The magenta and yellow tonal values ​​that produce a neutral color with a certain tonal value (usually 50) shall be determined: these tonal values ​​may also be determined in three additional groups. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. NOTE 26: Gray balance is determined by the cyan, magenta, and yellow tonal values ​​of the image, their subcolors, and the colors of the overprints. 4.2 Printed products
4.2.1 Visual characteristics of image portions
4.2.1.1 Substrate color
The CIELAB color space values ​​(L-, a\, b') and the color difference values ​​(AE) of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the gloss tolerance of the substrate that has been finished but not printed shall also be determined. The measurement method shall be as specified in 5.6 and the reporting method shall be as specified in A5.
4.2.1.2 Glossiness of printed matter
The glossiness and tolerance of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the glossiness of the substrate that has been finished but not printed shall also be specified. The measurement method shall be as specified in 5.5 and the reporting method shall be as specified in A5. 4.2.1.3 Color of ink
The (IELAB color space value) of the solid printed matter for each of the four primary colors shall be determinedReflectivity of solid ink:
D), the reflective density of a halftone area. NOTE
13 Also called "equivalent dot area" or "full dot area". The synonym "dot area" applies only to halftone images composed of dots. This definition can be used to provide proof of tone values ​​for certain printing plates. 3.41 Printing press print A print produced by a printing press (production press or proofing machine). Its purpose is to show the separation effect in a way that accurately simulates the effect of a printing press.
3.42 Process colors (for four-color printing)
yellow, magenta, cyan and black:
3.43 Hard dot film:
Color separation film with dots that can be reliably reproduced during film copying and plate making. 3.44 Tolerance variation tolerance The permissible error between a printed sample and a sample randomly taken from the production process: 3.45 Mil-tone pread (S) S is expressed as a white fraction and is determined by the following formula: S = max. (A1 - A1), (A1 - A1). (A1 - A1), (A1 - A1), (A1 - A1)] Where: . - measured tone value of cyan primary color image, A - specified tone value of primary color image; A. - measured tone value of magenta primary color image:
CB/T17934.1-1999
Am - specified tone value of magenta primary color image; A - measured tone value of yellow primary color image
A - specified tone value of yellow primary color image. Note 1a: Example: Measured value (,m-2) - (22-17,20) Specified value (cgmy) - (20.20.18) m8x: (22—20). (17-26), (2- 18)2min[(22- 20), (1720). (20-18)_ -- -3S=[max mitj-5
3.46 Center density (on screen printing) care dcnsity The transmission density at the center of a single opaque image element (such as a dot or line), 3.47 Principal axis
The axis of a dot row that is aligned with the longest diameter of an elongated dot (such as an elliptical or differential dot), Note 12: Square and square dots have no principal axis, 4 Technical requirements
The following clauses provide the characteristics and basic parameters of the visual effects and other technical aspects of specially screen printed products. Where necessary, measurement methods and recommended values ​​are given. NOTE 19: The information provided above about characteristics and basic parameters is very important for mutual communication during the screen adjustment process. In actual work, many parameters can be determined to have analytical values, so it is not necessary to specify each parameter explicitly. Such values ​​are specified in other parts of this standard. 4. Separations
4.1.7 Quality
The minimum dot center density and maximum dot edge width of the final separations should be determined: Note 20: Refer to Appendix C.4..2 Screen count
The screen count of each set of separations should be given in centimeters (m-). If the set of separations has more than one screen count, then each separation should be described separately or the specific screen count of the set should be clearly reported. Note
21 Coarse-grained substrates require a higher screen quality than smooth coated substrates, and their tone value range is limited, and the dot increase is too excessive. 22 The screen count of black-and-white images can be finer than that of color images. For example: 80rm-1 screen for black-and-white images and 62em-1 for color images. 23 See 4.1.3 25\, 4.1.3 Screen Angle
The screen angle of each color plate should be determined.
The measurement method should be as specified in 5.: The reporting method should be as specified in A1. Note
24 Please note that the standard screen angles of black, cyan and magenta differ by 30° from each other and by 15° from cyan or black. The main axis of the screen of the main color is 45° to the main direction. 25 When adding screens by computer, the parameters of "screen number" and "screen angle" of each color plate can be set. 4. 1.4 Dot shape and its relationship with tone value The shape of the dot and its relationship with tone value should be determined within the entire tone value range: the shape of the midtone dot should be determined (such as: round, square, elliptical). When using a screen with a main axis, the tone value of the first and second connection of the dot should be determined. The tone value measurement method should be in accordance with the provisions of 5.2; the reporting method should be in accordance with the provisions of A2. 4.1.5 Image size error
The maximum size error between any two color separations in the set of color separations is determined by the percentage of the image diagonal. The measurement method is: first, align the four color separations together along the upper left corner, then measure the maximum size difference in the lower right corner and express it as a percentage of the diagonal.
4.1.6 Tone value (dot area) total
GB/T 17934. 1—1999
The total tonal value of the darkest non-color portion of the image shall be determined. If necessary, it is preferred to determine the tonal value of the black plate image separately. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. 4.1.7 Gray balance
The magenta and yellow tonal values ​​that produce a neutral color with a certain tonal value (usually 50) shall be determined: these tonal values ​​may also be determined in three additional groups. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. NOTE 26: Gray balance is determined by the cyan, magenta, and yellow tonal values ​​of the image, their subcolors, and the colors of the overprints. 4.2 Printed products
4.2.1 Visual characteristics of image portions
4.2.1.1 Substrate color
The CIELAB color space values ​​(L-, a\, b') and the color difference values ​​(AE) of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the gloss tolerance of the substrate that has been finished but not printed shall also be determined. The measurement method shall be as specified in 5.6 and the reporting method shall be as specified in A5.
4.2.1.2 Glossiness of printed matter
The glossiness and tolerance of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the glossiness of the substrate that has been finished but not printed shall also be specified. The measurement method shall be as specified in 5.5 and the reporting method shall be as specified in A5. 4.2.1.3 Color of ink
The (IELAB color space value) of the solid printed matter for each of the four primary colors shall be determined46 Center density (on screen printing) care dcnsity The transmission density at the center of a single opaque image element (e.g., dot or line). 3.47 Principal axis
The axis of a dot array that is aligned with the longest diameter of an elongated dot (e.g., elliptical or angular). Note 12: Square and rectangular dots have no principal axis. 4 Technical requirements
The following clauses provide the characteristics and basic parameters that specifically define the visual effects and other technical aspects of screen printing. Where necessary, measurement methods and recommended values ​​are given. Note 19: The information provided above regarding characteristics and basic parameters is very important for mutual communication during the screen printing process. In actual work, many parameters can be determined with analytical values, so it is not necessary to specify each parameter explicitly. Such values ​​are specified in other parts of this standard. 4. Separations
4.1.7 Quality
The minimum dot center density and maximum dot edge width of the final separations should be determined: Note 20: Refer to Appendix C.4..2 Screen count
The screen count of each set of separations should be given in centimeters (m-). If the set of separations has more than one screen count, then each separation should be described separately or the specific screen count of the set should be clearly reported. Note
21 Coarse-grained substrates require a higher screen quality than smooth coated substrates, and their tone value range is limited, and the dot increase is too excessive. 22 The screen count of black-and-white images can be finer than that of color images. For example: 80rm-1 screen for black-and-white images and 62em-1 for color images. 23 See 4.1.3 25\, 4.1.3 Screen Angle
The screen angle of each color plate should be determined.
The measurement method should be as specified in 5.: The reporting method should be as specified in A1. Note
24 Please note that the standard screen angles of black, cyan and magenta differ by 30° from each other and by 15° from cyan or black. The main axis of the screen of the main color is 45° to the main direction. 25 When adding screens by computer, the parameters of "screen number" and "screen angle" of each color plate can be set. 4. 1.4 Dot shape and its relationship with tone value The shape of the dot and its relationship with tone value should be determined within the entire tone value range: the shape of the midtone dot should be determined (such as: round, square, elliptical). When using a screen with a main axis, the tone value of the first and second connection of the dot should be determined. The tone value measurement method should be in accordance with the provisions of 5.2; the reporting method should be in accordance with the provisions of A2. 4.1.5 Image size error
The maximum size error between any two color separations in the set of color separations is determined by the percentage of the image diagonal. The measurement method is: first, align the four color separations together along the upper left corner, then measure the maximum size difference in the lower right corner and express it as a percentage of the diagonal.
4.1.6 Tone value (dot area) total
GB/T 17934. 1—1999
The total tonal value of the darkest non-color portion of the image shall be determined. If necessary, it is preferred to determine the tonal value of the black plate image separately. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. 4.1.7 Gray balance
The magenta and yellow tonal values ​​that produce a neutral color with a certain tonal value (usually 50) shall be determined: these tonal values ​​may also be determined in three additional groups. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. NOTE 26: Gray balance is determined by the cyan, magenta, and yellow tonal values ​​of the image, their subcolors, and the colors of the overprints. 4.2 Printed products
4.2.1 Visual characteristics of image portions
4.2.1.1 Substrate color
The CIELAB color space values ​​(L-, a\, b') and the color difference values ​​(AE) of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the gloss tolerance of the substrate that has been finished but not printed shall also be determined. The measurement method shall be as specified in 5.6 and the reporting method shall be as specified in A5.
4.2.1.2 Glossiness of printed matter
The glossiness and tolerance of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the glossiness of the substrate that has been finished but not printed shall also be specified. The measurement method shall be as specified in 5.5 and the reporting method shall be as specified in A5. 4.2.1.3 Color of ink
The (IELAB color space value) of the solid printed matter for each of the four primary colors shall be determined46 Center density (on screen printing) care dcnsity The transmission density at the center of a single opaque image element (e.g., dot or line). 3.47 Principal axis
The axis of a dot array that is aligned with the longest diameter of an elongated dot (e.g., elliptical or angular). Note 12: Square and rectangular dots have no principal axis. 4 Technical requirements
The following clauses provide the characteristics and basic parameters that specifically define the visual effects and other technical aspects of screen printing. Where necessary, measurement methods and recommended values ​​are given. Note 19: The information provided above regarding characteristics and basic parameters is very important for mutual communication during the screen printing process. In actual work, many parameters can be determined with analytical values, so it is not necessary to specify each parameter explicitly. Such values ​​are specified in other parts of this standard. 4. Separations
4.1.7 Quality
The minimum dot center density and maximum dot edge width of the final separations should be determined: Note 20: Refer to Appendix C.4..2 Screen count
The screen count of each set of separations should be given in centimeters (m-). If the set of separations has more than one screen count, then each separation should be described separately or the specific screen count of the set should be clearly reported. Note
21 Coarse-grained substrates require a higher screen quality than smooth coated substrates, and their tone value range is limited, and the dot increase is too excessive. 22 The screen count of black-and-white images can be finer than that of color images. For example: 80rm-1 screen for black-and-white images and 62em-1 for color images. 23 See 4.1.3 25\, 4.1.3 Screen Angle
The screen angle of each color plate should be determined.
The measurement method should be as specified in 5.: The reporting method should be as specified in A1. Note
24 Please note that the standard screen angles of black, cyan and magenta differ by 30° from each other and by 15° from cyan or black. The main axis of the screen of the main color is 45° to the main direction. 25 When adding screens by computer, the parameters of "screen number" and "screen angle" of each color plate can be set. 4. 1.4 Dot shape and its relationship with tone value The shape of the dot and its relationship with tone value should be determined within the entire tone value range: the shape of the midtone dot should be determined (such as: round, square, elliptical). When using a screen with a main axis, the tone value of the first and second connection of the dot should be determined. The tone value measurement method should be in accordance with the provisions of 5.2; the reporting method should be in accordance with the provisions of A2. 4.1.5 Image size error
The maximum size error between any two color separations in the set of color separations is determined by the percentage of the image diagonal. The measurement method is: first, align the four color separations together along the upper left corner, then measure the maximum size difference in the lower right corner and express it as a percentage of the diagonal.
4.1.6 Tone value (dot area) total
GB/T 17934. 1—1999
The total tonal value of the darkest non-color portion of the image shall be determined. If necessary, it is preferred to determine the tonal value of the black plate image separately. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. 4.1.7 Gray balance
The magenta and yellow tonal values ​​that produce a neutral color with a certain tonal value (usually 50) shall be determined: these tonal values ​​may also be determined in three additional groups. The tonal values ​​shall be measured in accordance with 5.2 and reported in accordance with A2. NOTE 26: Gray balance is determined by the cyan, magenta, and yellow tonal values ​​of the image, their subcolors, and the colors of the overprints. 4.2 Printed products
4.2.1 Visual characteristics of image portions
4.2.1.1 Substrate color
The CIELAB color space values ​​(L-, a\, b') and the color difference values ​​(AE) of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the gloss tolerance of the substrate that has been finished but not printed shall also be determined. The measurement method shall be as specified in 5.6 and the reporting method shall be as specified in A5.
4.2.1.2 Glossiness of printed matter
The glossiness and tolerance of the unprinted substrate shall be determined. Where printed matter is to be surface finished, the glossiness of the substrate that has been finished but not printed shall also be specified. The measurement method shall be as specified in 5.5 and the reporting method shall be as specified in A5. 4.2.1.3 Color of ink
The (IELAB color space value) of the solid printed matter for each of the four primary colors shall be determinedIf the light source is a white substrate, it must be stated. Note 34: The color coordinates are dimensionless values ​​with a unit of 1. A7 Reflection density and relative reflection density
The reported density value should be retained to two decimal places:
"- Spectral characteristics + It is best to use the FI or T spectral characteristics in GB/T11501: 1. The density of unprinted substrates;
--The size of the measuring light hole:
--The substrate material other than Appendix B;
-Whether a polarization device is used:
Example 1: "The solid density of blue is 1.45, and the density of the substrate is 0.15. This value is the measurement hole of the T spectral characteristics without a polarization device.
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