pdf and pdfx-plus · •annotations •missing bleed pdf/x gwg. variants •there is one pdf/x-1a...
TRANSCRIPT
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PDF and PDF/X-Plus
David van DriesscheExecutive Director & co-chair Specifications Subcommittee, GWG
CTO, Four Pees
April 11, 2019
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Who am I?
• Started working at Enfocus in 1996(Tailor, PitStop…)
• Helped to start the Ghent Workgroup in June 2002• Co-founded Gradual Software in 2004
(Switch)• CTO at Four Pees from 2008
(working with callas software, axaio software, Elpical, InSoft…)
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UniversalSelf-sufficientCompatible
Vendor-neutralCompact
Well-behaved
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ISO 32.000
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www.gwg.org
PDF is not enough – PDF/X
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PDF/X origins…
• PDF/X-1 was developed by amongst others the DDAP (Digital Distribution of Advertising for Publishing).
• Taken up by the ISO standards organization• In 2001
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blind eXchange
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Standards in standards
PDF/X
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PDF/X flavors
• PDF/X-1, PDF/X-1a• PDF/X-2• PDF/X-3• PDF/X-4, PDF/X-4p• PDF/X-5g, PDF/X-5pg, PDF/X-5n• PDF/X-6
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PDF/X flavors
• PDF/X-1, PDF/X-1a• PDF/X-2• PDF/X-3• PDF/X-4, PDF/X-4p• PDF/X-5g, PDF/X-5pg, PDF/X-5n• PDF/X-6
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PDF/X-1a
• Based on PDF 1.4• No support for transparency (has to be flattened),
layers, JPEG-2000…• Supports only gray, CMYK and spot color
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PDF/X-4
• Based on PDF 1.6• Allows transparency, layers, JPEG-2000 etc.• Allows all color-managed color spaces– ICC-based gray, RGB, CMYK– Calgray, CalRGB– Lab– (and spot color as well of course)
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PDF/XPDF/A
PDF/UAPDF/EPDF/HPDF/VT
PDF/VCR
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www.gwg.org
PDF is not enough – Ghent Workgroup
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How did the GWG start?(January 2001)
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How did the GWG start?(February 2001)
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How did the GWG start?(April 2001)
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June 2002
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Mission Statement
To establish and disseminate process specifications
for best practices in graphic arts workflows
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Clash of the standards?
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Differences between PDF/X and GWG Specifications
• Faster• More practical• More user driven• Less accurate• Diversified for specific
markets
• Slower• More theoretical• More vendor driven• More accurate• A global graphic arts
standard
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Standards in standards
PDF/X
GWG
Workflow Specific
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PDF/X-Plus• Unintended spot colors• Low resolution• RGB images/artwork• Missing fonts• Hairlines• 4/C black elements / TAC• Page size inconsistent• Overprint problems• Annotations• Missing bleed
PDF/X GWG
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Variants
• There is one PDF/X-1a standard• There are many GWG specification variants– Newspaper Ads– Magazine Ads– Sheetfed Offset CMYK– Sheetfed Offset Spot Hi-Res– Sheetfed Offset Spot Lo-Res– …
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The GWG specifications
• Current standard• Used by most national standards in Europe• Based on PDF/X-1a
1v4
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The GWG specifications
• Used frequently for testing• Virtually not used in production (with the
exception of Switzerland)• Based on PDF/X-4
1v4 2012
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The GWG specifications
• Approved in October 2015• Based on PDF/X-4• Tested extensively• Implementation steps planned by
organizations
1v4 2012 2015
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www.gwg.org
Conclusions
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So what should you use?
• Ask your printer / publisher / significant workflow-other
• PDF• PDF/X– PDF/X-4– PDF/X-1a
• Ghent Workgroup specifications
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Where do you find that?
• gwg.org– Application Settings area– gwg.org/application-settings
• Look in your software– The settings might already be included!
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