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Document scanning is a method of converting paper documents to an electronic format that can then be stored digitally. This article outlines some of the key concepts and considerations required to optimize this process and result in a quality electronic document.

Core steps and considerations:

  1. Document Preparation
  2. Scanning
  3. Conversion to digital format (e.g. Tiff, JPG) or OCR (PDF, other)
  4. Compression

Document Preparation

Proper preparation is important for preserving the quality of your documents and protecting your scanner.

  • Remove staples, paperclips, and binder clips
  • Remove Post-it notes and attach notes. If these need to be scanned, photocopy them and scan as a separate page.
  • If possible, improve document quality by photocopying
  • Repair torn pages
  • Straighten folded corners

Scanning

You will need to determine the appropriate scanner driver settings for the types of documents you will be scanning. Scanning software should support the creation of multiple scan profiles that will accommodate various scan configurations such as Black and White, Gray scale, color, single sided (simplex), double sided (duplex), DPI (dots per inch - resolution), compression settings and type, border removal, speckle removal, rotation, drop out color, etc.

A raster image is a sequence of on and off pixels.

Words may look like a series of letters but they cannot be selected and are not understood by the system. Images need to be converted to an intelligent format to create a text searchable document such as PDF.

Document quality is important for readability. Black and white paper documents with fair or poor quality can sometimes be improved by scanning to Gray Scale.

Gray scale scanned images will be larger than pure Black and White scanned images. You will need to determine if you can afford the larger image size by scanning to Gray Scale.


See examples below:

Black and White Scanned Example


Gray Scale Scanned Example


DPI - Resolution Settings

Typically black and white business documents with little or no graphical elements are scanned at 200 dpi. If there are small details that need to be retained, it may be desirable to scan to 300 dpi. Higher resolutions will not improve image quality and will result in significantly larger file sizes.


Black and White 200 DPI Image Example

Gray Scale 200 DPI Image Example

Notice the increased image quality and detail in the 200 DPI Gray Scale image and further image quality improvements below in the 300 DPI Gray Scale image below

Gray Scale 300 DPI Image Example

Compression

  • Losless – less compression but no data loss (TIF)
  • Lossy – deep compression with subsequent data loss (JPG)


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