PDF/A-3 for preservation. Notes on embedded files and JPEG2000
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Johan van der Knijff, the National Library of the Netherlands, presented his views on ‘PDF/A-3 for preservation’ based on notes on embedded files and JPEG2000. The presentation was given at DPC briefing (http://bit.ly/1b487mD) which introduced and reviewed recent developments with the PDF / A standard, with particular emphasis on PDF/A version 3 published in October 2012. The meeting took place in Leeds on 13 March 2013.
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PDF/A-3 for preservation. Notes on embedded files and JPEG2000
- 1. SCAPE Johan van der Knijff Koninklijke Bibliotheek – National Library of the Netherlands DPC, PDF/A-3 Briefing, Leeds, 13.3.2013 PDF/A-3 for preservation Notes on embedded files and JPEG 2000
- 2. Part 1: Embedded files PDF/A-3: embedding of any file (type)
- 4. Key point: Use of “embedded files” really means “embedded file streams” = specific data structure in PDF!
- 5. File specification dictionary 31 0 obj <</Type /Filespec /F (mysvg.svg) /EF <</F 32 0 R>> >> endobj
- 6. File specification dictionary 31 0 obj <</Type /Filespec /F (mysvg.svg) /EF <</F 32 0 R>> >> endobj EF key points to embedded file stream
- 7. Embedded file stream 32 0 obj <</Type /EmbeddedFile /Subtype /image#2Fsvg+xml /Length 72>> stream …SVG Data… endstream endobj
- 8. Uses of embedded file streams
- 10. File attachments not meant to be rendered by viewer
- 11. File attachment annotation EmbeddedFiles entry in name dictionary PDF/A-3
- 13. Rendered in/by PDF viewer
- 15. What about inline images?
- 16. Not based on “embedded file stream”, but on “Image XObject” data structure (allows limited set of pre-defined formats) What about inline images?
- 17. No impact on content that is meant to be rendered by PDF viewer But PDF/A-3’s may contain file of any possible format as an attachment Embedded files wrap-up:
- 18. Part 2: JPEG 2000 Supported since PDF/A-2
- 20. Image XObject 1614 0 obj <</Subtype/Image/Width 615/Height 978/ColorSpace/DeviceRGB /BitsPerComponent 8/Interpolate true/Length 5278 /Filter/JPXDecode>> stream … Image data … :: :: endstream endobj
- 21. Image XObject 1614 0 obj <</Subtype/Image/Width 615/Height 978/ColorSpace/DeviceRGB /BitsPerComponent 8/Interpolate true/Length 5278 /Filter/JPXDecode>> stream … Image data … :: :: endstream endobj Identifies object as JPEG 2000 image
- 22. ISO 19005-2 (PDF/A-2): JPEG 2000 support based on subset of JPEG 2000 Part 2 (JPX baseline) Only Part 1 of the standard (JP2) commonly used for archival applications!
- 23. JP2 vs JPX JP2 JPX JPEG 2000 Part 1: Basic still image format JPEG 2000 Part 2: = JP2 + assorted advanced stuff …
- 24. Fragmented codestreams Allowed in JPX Baseline!
- 25. OS PDF viewers – JPEG 2000 libraries Ghostscript: OpenJPEG or JasPer Evince: OpenJPEG Mupdf: OpenJPEG Firefox PDF viewer: built-in decoder None of these libraries support fragmented codestreams!
- 26. Is it really a problem? Fragmented codestreams extremely rare But why is this feature even allowed in a long- term archival format? OS support of JPEG 2000 in general remains problematic
- 27. #SCAPEProject http://www.scape-project.eu This work was partially supported by the SCAPE Project. The SCAPE project is co-funded by the European Union under FP7 ICT-2009.4.1 (Grant Agreement number 270137). Funding