A range of derivatives are produced for Web delivery of the National Library’s digitised collection material, employing the following standards:
Derivative and file type Set of standards used

Thumbnail copy (JPEG)

  • Derived for all material formats from TIFF master
  • Resolution: 72 ppi
  • Longest dimension: 150 pixels (e.g. 118x150 portrait; 150x118 landscape)

View copy (JPEG)

  • Derived from TIFF master using Image Alchemy software
  • Resolution: 72 ppi
  • Longest dimension: 600 pixels for pictures and 760 pixels for manuscripts, maps and music (e.g. 590x760 portrait; 760x760 square; 760x590 landscape)

View copy (multi-page PDF)

  • Created for print publications scanned for Copies Direct orders
  • Derived from multi-page TIFF master
  • Compressed
  • Resolution: 72 dpi
  • Longest dimension: 1000 pixels

Examination copy (JPEG)

  • Derived for printed music and cartographic materials from TIFF master using Image Alchemy software
  • Resolution: 72 ppi
  • Longest dimension: 1000 pixels (e.g. 781x1000 portrait; 1000x1000 square; 1000x781 landscape)

Print copy (PDF)

  • Derived for printed music from JPEG examination copies using Image Alchemy software
  • Compressed
  • Resolution: 72 dpi
  • Longest dimension: 1000 pixels

Interactive copy (MrSID)

  • Created primarily for cartographic material from TIFF master using MrSID software
  • Compressed
  • Resolution: 300 ppi
  • Longest dimension: as per the TIFF master (varies according to the original physical item)

NB* The shorter dimension is set to whatever is appropriate to maintain the aspect ratio of the image.