PDF/UA, like PDF itself, is internally complex, but used correctly, actually makes things easier.PDF Association expands its board of directors
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René Treuber, Product Manager of axaio software, will be hosting a presentation titled “Introducing ISO standards for PDF “processing steps” and “print product metadata”” at the PDF Days Europe 2018. In this Interview he gives some background information about it.Interview with Roman Toda, CTO of Normex, about PDF Days Europe 2018
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by Dietrich von Seggern
PDF/X is a subset of PDF – see “Technical side and requirements of PDF/X” for an overview. As such, conforming with PDF/X means accepting specific requirements and restrictions to the use of the PDF format.
One principle of PDF/X is that conforming files must be complete, i.e. fully self-contained. In addition, nothing may appear on a PDF/X page that is either not printable at all (such as video or 3D) or where print output is not fully defined (for example, if a font is not embedded). While the first rule is rather easy to implement, the latter is more difficult. PDF allows for many complex situations, for example, colors in semi-transparent overlapping objects. In other cases, it may not be clear whether objects on a layer are to be printed. There are many other cases of interdependencies in which it is difficult to determine whether the print result is unambiguously defined, or not.
Certain features needed only for some print applications (e.g., a bleed zone) are not required in PDF/X as they are not required in all print products. Wherever it makes sense in such cases, however, PDF/X requires that if such information is present, it must be accurate. PDF/X requires, for example, that if a bleed zone is defined then that zone must not be enclosed by the trimmed print product.
These requirements apply in all parts and conformance levels of PDF/X.
PDF/X does not include provisions that although important, may vary depending on the printing conditions, e.g. the minimum image resolution or the bleed zone.
Other non-ISO standards have been developed based on PDF/X that cover such production specific requirements (see “Further quality requirements: PDF/X-Plus” for further information).