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Scanners Mary Van Court
 

Scanners Mary Van Court

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Presentation on optimal scanner settings given by Mary Van Court fo rhte RML Rendezvous, March 10, 2010.

Presentation on optimal scanner settings given by Mary Van Court fo rhte RML Rendezvous, March 10, 2010.

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    Scanners Mary Van Court Scanners Mary Van Court Presentation Transcript

    • Not Through a Glass, Darkly
      Tips and Tricks forOptimal Scanner SettingsMary Van Court
      University of WashingtonHealth Sciences Library
    • Before you start…
      What do you want to scan?
      What kind of digital file do you want?
      Do you have the right software?
    • Do you want to scan a photo or a multipage document?
    • Photos are usually scanned asJPEG or GIF files
      Use JPEG for complex images
      > 16 million colors
      Not as sharp as GIF
      Use GIF for line art or logos
      Sharper than JPEG
      256 colors
    • Multipage documents are usually scanned as PDF or TIFF files
      Most people are more comfortable with PDF
      Some applications require TIFF (such as Ariel for Interlibrary Loan)
      Lots of programs to convert between theme.g. DocMorph from the National Library of Medicine (http://docmorph.nlm.nih.gov/docmorph/).
    • Look at the software
      The software that came with your scanner will usually do a good job of scanning photos, but will it do what you want?
    • Every scanner/software combination is different
    • Some walk you through the process step by step
    • Some show all your scanningoptions on one screen
    • Some give you a few optionsand make you look for the rest
    • Sometimes there are multiple places to look
    • Select the file format
    • Select the resolution
      For web display
      100 dpi
      For standard printing
      240 – 300 dpi
      For glossy printing or posters
      Scanner maximum
      dpi = dots per inch
    • Sometimes the resolution setting is explicit
    • Sometimes there are sliders
      This one shows the relationship between resolution and file size.
    • Select the image type/mode
    • Sometimes it’s more cryptic
      24-bit color
      256 colors
      8 colors
      RGB colors
      Line drawing
      Half tone
      Text + photo
      Generation
    • Set the physical parameters
      It’s often automatic, but sometimes you have to set:
      Paper size
      Flatbed scanner vs. document feeder
      One or two-sided original
      Scanner accessories
    • Adjust the image parameters
      Brightness
      Threshold
      Contrast
      Dithering
      Despeckle
    • Sometimes settings are pictures – not words
    • Settings are not consistent from scanner to scanner
      Does the scan get lighter or darker when you increase the brightness?
    • Optical Character Recognition (OCR)
      A
      Lots of programs to convert paper image to text
      Need to scan at 300 – 400 dpi
      97-99% accurate
      Can create searchable image
    • Post scanning editing
      Variety of software
      Lots of different features
      Shop around for what you want
    • The bottom line is …
      There are a lot of choices. Keep looking until you find one that works for you.