Offline proofs information sheet * Off-line proofs should be sent with a copy of the sample job information sheet to identify the proofing product, system used, name, address, and contacts of the prepress service provider.
* Samples should also contain information about the consistency of the application data specification sheet with the producer.
Control Strips* All offline proofs should have color control strips. These color control bars are screened 133 lines/inch over all halftone proofs (analog or digital). All color control strips should include a solid color block of each primary color, 25%, 50%, 75% tone blocks, solid overprint color blocks, and at least one gray balance color block (cyan = 50%, product, yellow = 39 %). At the same time, it is recommended to use 25%, 50%, 75% of two-color overprint color blocks. These color control strips can be provided in the form of a manufacturer's color control proofs, GCA/GATF proofreaders or GATF/SWOP proofing control strips or equivalent digital files. Exposure control elements can also be included when appropriate.
Density and colorants for off-site proofing of density and color in the field are determined according to the SWOP Hi-Lo Color Reference. Due to different processes (environment, gloss, color sequence, color, etc.), the value of the offline proofing system may differ from the SWOP Hi-Lo color manual, but it should be consistent with the application data specification sheet.
Dot enlargement and gray balance* The goal of tone reproduction is based on the proofing process of the SWOP press. The imaging features of various technologies can lead to slight differences in color and gradation conversion, but it must be consistent with the apparent effects of SWOP printing proofs and acceptability. The value provided for dot gain is listed on each producer's application data specification sheet.
* For off-line printing proofs, it is important to obtain a grey balance that matches the SWOP print sample as closely as possible.
Color Sequences * Users of off-line proofing materials will note that the producers of these products often come up with special color orders for colorants. These color sequences do not have to be the same with the printing press or the printing sequence in the production process.
Substrate * Proofing proofs are defined as receiving material and should be tested on blank areas that include all layers provided by the proofing system.
* The apparent characteristics of off-line proofing materials should be similar to SWOP proofing materials.
* Each manufacturer specifies the materials used in their application data specification sheet.
Certification/Conformance/Tolerance* Process samples containing the actual off-line proofs of color images and a SWOP-approved control strip can be sent to the GATF/SWOP off-line proofing certification program group.
* Samples sent will be visually and instrumentally compared to determine the consistency of the manufacturer's application data specification. Then you can get a report.
* This certification program does not allow SWOP certification of any proofing system or product.
The GAA input specification for gravure printing applies to GAA input specifications for gravure printing using film or electronic documents, as with the SWOP specification. Many publications now successfully use these two kinds of printing techniques to produce magazines. Advertisers who advertise in magazines hope that the advertising effectiveness of these two kinds of craftsmanship matches the effect of the SWOP color guide. For this reason, GAA adopted the SWOP specification as the basis for advertising materials used in gravure printing.
Listed below are several pieces of information that the GAA feels it needs to add to help Gravure Publishing prepare to enter the job.
Printed materials have a significant difference between the GAA and SWOP specifications that users should be aware of. Unlike the SWOP specification, the GAA input specification applicable to gravure printing is applicable to coated paper and non-coated paper. The degree of matching of the final gravure copying effect with the color proof in terms of whiteness, print smoothness, and color glossiness is determined by the printed paper of the publication.
Color gravure standard colors are matched with SWOP colors, sometimes GAA/SWOP colors. The standard reference manual for these colors is the SWOP Hi-Lo color manual. The colorimetric values ​​of these reference manuals are freely available from GAA. (GAA Color Code for Printing Proofing and Printing Process - Version 1.6 1992)
As long as there is no moiré at the corner, any corner can be used. However, experience shows that in addition to yellow, other gravure halftone input film angle can not be between 75 degrees -105 degrees.
Total Overprinting (TAC)
Like the SWOP specification for web offset printing, the GAA stated that the requirement for the total number of overprints is 300%. However, for gravure and non-coated paper printing, the publisher is not limited to using 300% of this amount, but often uses a higher dot overlap.
Non-Color Structure (GCR) and Undertone Gain (UCA)
Because of the reduced opacity of non-coated papers and increased porosity, GCR applications are not applicable to all non-coated paper users. Therefore, the use of GCR for non-coated papers must be recognized by all participating agencies. In the offset printing preparation process, after the UCR is used in the black or dark gray area, the tri-color balanced gray area must achieve a visually neutral grey effect.
Key image area In any printing process, the color of all three primary colors, if the dot value is 5% or less, is difficult to duplicate accurately. However, if the image area with a dot value of 5% or less is an important area for expressing advertising content, then it is a key image area. The edges of the image and the highlighted background portion fall into this category.
* Ensure a good gradation reproduction in key image areas where the color composition should be at least 5% minimum. The highlights and areas of metallic sheen should be represented by the white of the paper.
Text and lines are anti-white, overprinting characters and lines should not be placed together with the primary color separation film, but should be given as an independent film. This allows printers the flexibility to use their equipment to provide the best reproduction quality possible.
Electronic documents Electronic documents are also a form of input for gravure personnel and have been promoted throughout the use process. The use of electronic documents instead of halftone films will improve the accuracy of registration and color reproduction. The GAA supports the work of CGATS SC6 and DDAP in the development of this standard. However, until these new standards were completed and approved by the ANSI organization (American National Standards Institute), GAA recommended the following methods that users can use:
* Digital information exchange between image systems should be consistent with the GAA-approved ANSI and ISO standards - TIFF/IT digital communication standards using the P1 option. For more detailed information on the electronic document exchange, see the section on the production and exchange of electronic documents in the SWOP specification.
* Use of electronic documents should be recognized by all relevant organizations.
* Samples should also contain information about the consistency of the application data specification sheet with the producer.
Control Strips* All offline proofs should have color control strips. These color control bars are screened 133 lines/inch over all halftone proofs (analog or digital). All color control strips should include a solid color block of each primary color, 25%, 50%, 75% tone blocks, solid overprint color blocks, and at least one gray balance color block (cyan = 50%, product, yellow = 39 %). At the same time, it is recommended to use 25%, 50%, 75% of two-color overprint color blocks. These color control strips can be provided in the form of a manufacturer's color control proofs, GCA/GATF proofreaders or GATF/SWOP proofing control strips or equivalent digital files. Exposure control elements can also be included when appropriate.
Density and colorants for off-site proofing of density and color in the field are determined according to the SWOP Hi-Lo Color Reference. Due to different processes (environment, gloss, color sequence, color, etc.), the value of the offline proofing system may differ from the SWOP Hi-Lo color manual, but it should be consistent with the application data specification sheet.
Dot enlargement and gray balance* The goal of tone reproduction is based on the proofing process of the SWOP press. The imaging features of various technologies can lead to slight differences in color and gradation conversion, but it must be consistent with the apparent effects of SWOP printing proofs and acceptability. The value provided for dot gain is listed on each producer's application data specification sheet.
* For off-line printing proofs, it is important to obtain a grey balance that matches the SWOP print sample as closely as possible.
Color Sequences * Users of off-line proofing materials will note that the producers of these products often come up with special color orders for colorants. These color sequences do not have to be the same with the printing press or the printing sequence in the production process.
Substrate * Proofing proofs are defined as receiving material and should be tested on blank areas that include all layers provided by the proofing system.
* The apparent characteristics of off-line proofing materials should be similar to SWOP proofing materials.
* Each manufacturer specifies the materials used in their application data specification sheet.
Certification/Conformance/Tolerance* Process samples containing the actual off-line proofs of color images and a SWOP-approved control strip can be sent to the GATF/SWOP off-line proofing certification program group.
* Samples sent will be visually and instrumentally compared to determine the consistency of the manufacturer's application data specification. Then you can get a report.
* This certification program does not allow SWOP certification of any proofing system or product.
The GAA input specification for gravure printing applies to GAA input specifications for gravure printing using film or electronic documents, as with the SWOP specification. Many publications now successfully use these two kinds of printing techniques to produce magazines. Advertisers who advertise in magazines hope that the advertising effectiveness of these two kinds of craftsmanship matches the effect of the SWOP color guide. For this reason, GAA adopted the SWOP specification as the basis for advertising materials used in gravure printing.
Listed below are several pieces of information that the GAA feels it needs to add to help Gravure Publishing prepare to enter the job.
Printed materials have a significant difference between the GAA and SWOP specifications that users should be aware of. Unlike the SWOP specification, the GAA input specification applicable to gravure printing is applicable to coated paper and non-coated paper. The degree of matching of the final gravure copying effect with the color proof in terms of whiteness, print smoothness, and color glossiness is determined by the printed paper of the publication.
Color gravure standard colors are matched with SWOP colors, sometimes GAA/SWOP colors. The standard reference manual for these colors is the SWOP Hi-Lo color manual. The colorimetric values ​​of these reference manuals are freely available from GAA. (GAA Color Code for Printing Proofing and Printing Process - Version 1.6 1992)
As long as there is no moiré at the corner, any corner can be used. However, experience shows that in addition to yellow, other gravure halftone input film angle can not be between 75 degrees -105 degrees.
Total Overprinting (TAC)
Like the SWOP specification for web offset printing, the GAA stated that the requirement for the total number of overprints is 300%. However, for gravure and non-coated paper printing, the publisher is not limited to using 300% of this amount, but often uses a higher dot overlap.
Non-Color Structure (GCR) and Undertone Gain (UCA)
Because of the reduced opacity of non-coated papers and increased porosity, GCR applications are not applicable to all non-coated paper users. Therefore, the use of GCR for non-coated papers must be recognized by all participating agencies. In the offset printing preparation process, after the UCR is used in the black or dark gray area, the tri-color balanced gray area must achieve a visually neutral grey effect.
Key image area In any printing process, the color of all three primary colors, if the dot value is 5% or less, is difficult to duplicate accurately. However, if the image area with a dot value of 5% or less is an important area for expressing advertising content, then it is a key image area. The edges of the image and the highlighted background portion fall into this category.
* Ensure a good gradation reproduction in key image areas where the color composition should be at least 5% minimum. The highlights and areas of metallic sheen should be represented by the white of the paper.
Text and lines are anti-white, overprinting characters and lines should not be placed together with the primary color separation film, but should be given as an independent film. This allows printers the flexibility to use their equipment to provide the best reproduction quality possible.
Electronic documents Electronic documents are also a form of input for gravure personnel and have been promoted throughout the use process. The use of electronic documents instead of halftone films will improve the accuracy of registration and color reproduction. The GAA supports the work of CGATS SC6 and DDAP in the development of this standard. However, until these new standards were completed and approved by the ANSI organization (American National Standards Institute), GAA recommended the following methods that users can use:
* Digital information exchange between image systems should be consistent with the GAA-approved ANSI and ISO standards - TIFF/IT digital communication standards using the P1 option. For more detailed information on the electronic document exchange, see the section on the production and exchange of electronic documents in the SWOP specification.
* Use of electronic documents should be recognized by all relevant organizations.
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