![]() ![]() Document part metadata (DPM) is a simple mechanism that allows for the exchange of information regarding a set of content pages to aid the receiver of the PDF files in determining the intended use of those content pages in the final print product. PDF files represent content pages and do not normally contain information identifying the usage of these content pages in print production. ![]() ISO 19593 standardizes the use of PDF layers (technically the PDF optional content group (OCG) feature) for communicating a wide variety of processing steps applicable to the packaging industry.Įxample PDF with processing steps visible Print Product Metadata (ISO 21812) In this way a PDF file can serve as a interoperable container for all production data, printing and non-printing, of a printed product, such as a package or a label. This data must be encoded in PDF in a commonly agreed manner so that it may be excluded during printing and only applied during the correct processing step. These non-printing PDF objects and metadata correspond to additional processing steps, for example die cutting, creasing, clear varnishing, white underprint, areas for gluing, Braille, etc. It is common practice in the packaging segment, and other segments of the printing industry, to work with PDF files that contain PDF graphics objects to be used for printing and additional PDF graphics objects and metadata to be used for other steps in the production of the final product. Print workflow and metadata standards are used to communicate the intended appearance, processing steps, or job tickets for printed products through the use of existing PDF features.
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