Image Digitization Standards

Staff digitizing images
Staff digitizing images
Master Image

  • Tonal depth: 24-bit colour
  • Format: TIFF
  • Compression: Uncompressed
  • Spatial Resolution: 1200 dpi
  • Represents as closely as possible the information contained in the original
  • Serves as long term source for derivative files
  • Can serve as surrogate for the original
  • High quality
  • Used for creating high quality print reproductions
  • Remains in a controlled environment, with limited use

 

Web Access Image

  • Tonal depth: 24-bit colour
  • Format: JPEG
  • Compression: Compressed for speed of access
  • Spatial Resolution:
    • Resize images to 640 pixels in their longest dimension (either width or height)
    • 96 dpi
  • Used in place of master image for general web access
  • Generally fits within viewing area of average monitor
  • Reasonable file size for fast download time; does not require a fast network connection
  • Acceptable quality for general research

 

Thumbnail Image

  • Format: JPEG
  • Compression: Compressed for speed of access
  • Spatial Resolution:
    • Resize originals to 150 pixels in their longest dimension (either width or height)
    • 72 dpi
  • Designed to display quickly online; allows users to determine whether they want to view Access Image
  • Serves as a long term source for derivative files 

 

Equipment Used for PreVIEW

  • Scannx Book Scanner 6167  [Book Scanner and Document Capture]
  • Epson Perfection V750 Pro [Flatbed Scanner]
  • Kodak Perfect Page [Document Scanner]
  • Plustek Optic Film 120 [Film Scanner – 35mm negatives, mounted slides, & 120mm medium format film]
  • Colortrac Smart tlf Gxt T42 [Large Format Map Scanner]
  • Digital Asset Management System – Canto Cumulus 8 Web Publisher Pro
  • Storage Array Network (SAN): Dell EMC RAID storage System with Fibre
  • Channel host interfaces and Fibre Channel disk drives
  • Dell Graphic Workstations with 20” LCD Monitor

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