GAA Gravure Publishing Input Parameter Description

The publication input parameter descriptions for providing film and electronic documents for GAA gravure printing are in fact consistent with the SWOP parameter descriptions previously described. Many publishers now successfully use two kinds of printing processes to produce magazines. Advertisers who advertise in these publications expect both technologies to match the SWOP color guides they provide. Therefore, GAA has adopted the SWOP parameter description as the basic standard for the use of advertising materials in gravure printing.

In the following list of areas, GAA believes that providing additional information will help suppliers prepare gravure printed input materials.

There is a clear difference between the GAA and SWOP parameter descriptions for printing substrates that the user should be aware of. Unlike the description of the SWOP parameters, the GAA gravure publication input parameters describe the parameters for both coated and uncoated printed materials. The degree of matching of brightness, print smoothness and glossiness of the final gravure reproduction product to the color guide is determined by the printed material used in the publication.

The standard color of color gravure should conform to SWOP color, sometimes written as GAA/SWOP. The standard reference for these colors is the SWOP high and low color reference. The reference color data can be obtained free of charge by GAA. (Description of GAA color parameters for publication proofing and printing - Revision 1.6 1992.)

As long as the screening angle can avoid the moiré, any screening angle can be used. However, the experience of gravure half-tone film input shows that other printing primary colors except yellow should avoid 75 degrees and 105 degrees.

Total Ink Coverage (TAC)
The GAA agrees that SWOP requires 300% of the TAC for web offset printing. However, 300% of TAC is not a limiting factor for gravure printing. Some publishers believe that using higher TAC values ​​on non-coated surfaces will be better.

Ash Component Substitution (GCR) and Background Gain (UCA)
Due to reduced opacity and increased porosity of non-coated materials, GCR applications may not be suitable for all users of non-coated materials. Therefore, the application of GCR on non-coated materials is a problem that needs to be solved by all members.

During the offset preparation process, the three-color balance (cyan, shade, and yellow) obtained after passing through the GCR in the black or dark gray area must be maintained with a visually neutral gray feel.

Hard-to-replicate image areas A variety of colors consisting of three printing primaries (cyan, shade, and yellow) with a 5% dot value (or lower dot value) are difficult to duplicate accurately in any printing process. This is often the case for graphic edge and light background patterns.

In order to ensure a good tone reproduction for image areas that are difficult to copy, the lightest composite color should consist of no less than 5% dots. The highlights and reflected light should be represented by the white color of the paper.

Fonts and line drawings that are anti-white, two-set sun-printed fonts, and line drawings should not be included in the four-primary color separation film. Instead, a separate film should be provided. This brings more flexibility to the printer and produces the best product for the device.

Electronic documents Electronic documents have become a way of selecting gravure input, and printers are strongly encouraged to use electronic documents. Providing electronic documents to replace halftone film will bring about improved registration and improved color reproduction accuracy. The GAA supports the current development of standards for CGATS SC6 and DDAP. But unless these new standards have been finalized and approved by the American National Standards Institute (ANSI), GAA will still advise users to follow the following points:

Digital information exchange between image systems should be based on GAA-approved ANSI and ISO standards - the TIFF/IT digital exchange standard using the P1 option.

The use of electronic documents must be approved in advance by all participating members.

More detailed information on GAA Gravure Publishing input parameter descriptions can be obtained through the Gravure Association of America.

Compliance with the SWOP parameters Description All provided copy materials should be sent before the deadline set by the publisher for inspection by publishers and printers. If the publisher's deadline is exceeded, the license extension period allows sufficient time to request new materials.

If the publisher receives print material that does not comply with the SWOP specifications and does not use a standard survey report that provides advertising material, a report on the change and its consequential consequences should be produced immediately and sent immediately to the advertising agency's production manager. In your hands, use the name of the advertising agency if possible. If time permits, a copy of the survey report should also be sent to the agency production manager and prepress service provider.

All materials received within the extension of the publisher must be checked if time permits, but they can also be passed. If the latest material does not match the specifications, the effect may be different from the expected effect.
If the material provided does not meet the approved parameter descriptions, the quality of the final printed product will be adversely affected, it is necessary to submit a report in advance.

Further information The transport film of the material is divided into single sheets, safely packaged and fully protected against any possible scratches, punctures and folds.

Securely package electronic files on tape or disk before shipping.

The proofs must be accompanied by film and electronic documents and cannot be folded during the transfer.

The content of the package should be confirmed outside to determine the type of material contained.

Paper Size View individual publisher’s mechanical parameter descriptions to determine the true size and standard size (no bleeding) and bleeding size of the ad.

All important actual content, including all forms of content, should be guaranteed to be within 3/8” of the edge of the final finished product to ensure that no important information is trimmed.

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