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When sending faxes, the receiver always says that the fax is illegible... What the best dpi, contrast, brightness, etc (when scanning) in order to send a legible fax?

PS: I'm using Win7's built-in fax software. I don't know anyone that owns a color fax machine to receive faxes, then I need to send black/white or grayscale option. Thank you!

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2 Answers

up vote 2 down vote accepted

Oh, you're scanning something into Windows and then faxing it out from there.

Remember that fax technology only supports 1-bit color depth. There is no greyscale. So set your scanner to do that and then tweak the preview until you can read it.

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I always set my fax machine to "superfine" resolution, which seems to help a lot, assuming the other end supports it.

These are the supported resolutions, according to Wikipedia:

  • Horizontal: 100 scan lines per inch
    • Vertical: 100 scan lines per inch
  • Horizontal: 200 or 204 scan lines per inch
    • Vertical: 100 or 98 scan lines per inch ('Standard')
    • Vertical: 200 or 196 scan lines per inch ('Fine')
    • Vertical: 400 or 391 (note not 392) scan lines per inch ('Superfine')
  • Horizontal: 300 scan lines per inch
    • Vertical: 300 scan lines per inch
  • Horizontal: 400 or 408 scan lines per inch
    • Vertical: 400 or 391 scan lines per inch ('Ultrafine')
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