GAA gravure publishing input parameter description

Many publishers are now successfully using two printing processes to produce magazines. Advertisers who advertise in these publications expect both technologies to match the SWOP color guide they provide. Therefore, GAA has adopted SWOP parameter description as the basic standard for the use of advertising materials in gravure publication and printing.

In the areas listed below, GAA believes that providing additional information will help suppliers prepare input materials for gravure publishing.

Printing materials

There is a clear difference between GAA and SWOP parameter descriptions that users should be aware of. Unlike SWOP parameter descriptions, GAA gravure publishing input parameter descriptions provide parameters for coated and uncoated printing materials. The degree to which the final gravure reproduction product matches the brightness, smoothness and gloss of the printed matter in the color guide is determined by the printed materials used in the publication.

color

The standard color of gravure printing should conform to SWOP color, sometimes written as GAA / SWOP. The standard reference for these colors is the SWOP high and low color reference. These reference chromaticity data can be obtained free of charge through GAA. (GAA chromaticity parameter description for publication proofing and printing-Rev. 1.6 1992.)

Screening angle

As long as moiré can be avoided, any screen angle can be used. However, the experience of inputting halftone film in gravure printing shows that other primary colors other than yellow should avoid 75 degrees and 105 degrees.

Total ink coverage (TAC)

GAA agrees that SWOP's TAC requirements for web offset printing must reach 300%. However, 300% TAC is not a limiting factor for gravure publishing. Some publishers believe that using a higher TAC value on the surface of non-coated materials will be better.

Gray component substitution (GCR) and background color gain (UCA)

Due to the decrease in 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 to be solved, and it needs to be approved by all members in advance.

During the preparation of offset printing, the three-color balance (cyan, magenta, and yellow) obtained by GCR in the black or dark gray area must maintain the visual neutral gray feeling.

Image areas that are difficult to copy

Various colors composed of three printing primary colors (cyan, magenta, and yellow) with a dot value of 5% (or lower dot value) are difficult to accurately reproduce in any printing process. Graphics edges and light background patterns often fall into this category.

In order to ensure good tonal reproduction of difficult-to-reproduce image areas, the lightest synthetic colors should all consist of dots of not less than 5%. Highlights and reflected light should be expressed by the white color of the paper.

Font and line drawing

Inverse characters, double-printed fonts and line drawings should not be included in the four primary color separation film, but a separate film should be provided. This brings greater flexibility to the printing staff and can produce the best products relative to the equipment.

Electronic document

Electronic files have become an option for gravure input and strongly encourage printers to use electronic files. Providing electronic files to replace halftone films will lead to improved registration and improved color reproduction accuracy. GAA supports the current standard development of CGATS SC6 and DDAP. But unless these new standards have been finalized and approved by the American National Standards Institute (ANSI), GAA will still recommend users to follow the following points:

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

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

More detailed information on input parameter descriptions for GAA gravure publishing can be obtained through the American Gravure Association.

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