Multi-page digital content handling

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Main Page > Code Documentation > Multi-page digital content handling

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Contents

[edit] Base Use-Case

  • Contributor uploads a multi-page digital object, such as a book, as a multi-page PDF or JPEG.
  • System creates multiple single-page information object+digital object children of book information object. Child IO title = page 1, page 2, etc.
  • Researcher can view a child (page) information object and has an easy way to switch to the prev/next page (page turner, coverflow, etc.)

[edit] Other possible features

  • Flag to activate page turner for only selected IO's?
  • Prompt contributor before creating child objects? (i.e. Allow contributor to say "no" and create children manually)
  • Prompt contributor for title pattern (grep, placeholder) for "page" names (e.g. "sheet 1, sheet 2...", "photo 1, photo 2...")

[edit] External libraries

[edit] Terminology

The OAI-ORE standard refers to digital objects containing multiple sub-objects (e.g. multi-page tif or pdf files) as "Compound Digital Objects", so we've chosen to follow this language.

[edit] See Also

[edit] Libraries for manipulating multi-page documents

Identify command output for multi-page tiff

[edit] JPEG

Jpeg and Jpeg2000 do not support multi-page images [1].

[edit] TIFF

With ImageMagick:

  • Can manipulate (convert) and return meta-data (identify) for multi-page tiffs. Meta-data needs to be parsed separately.

With GD lib:

  • May be possible to extract multi-page TIFF meta-data via the iptcparse() function though it's unclear what proportion of TIFFs will contain IPTC IIM data. iptcparse() appears to be incompatible with XMP and or "IPTC Core Schema for XMP" data formats.
  • Unclear if GD lib allows manipulation of multi-page TIFF files

[edit] PDF

Note: Multi-page viewing of PDF files is available in most browsers via Adobe Reader.

Imagemagick:

GD lib:

  • GD lib has no support for PDFs. See pdflib below.

Other libraries:

  • pdflib is a PEAR package for PHP that must be installed separately.
  • fpdf is a third-party PDF library for PHP.
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