Barcode Density

Legacy Poster

• 31. August 2012 16:33

Hi,
If I am using a barcode 128 with a density of 27.636 chars/in, wouldn't the lenght of 27 X's be just over 1 inch?

Thanks,
Ken

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  Michael Toupin (mtoupin

  ★ BarTender Hero ★

  • 31. August 2012 17:43
  [quote name='mgracr' timestamp='1346430830' post='3177']
  Hi,
  If I am using a barcode 128 with a density of 27.636 chars/in, wouldn't the lenght of 27 X's be just over 1 inch?
  
  Thanks,
  Ken
  [/quote]
  Hi Ken,
  
  No, it would actually be a bit over 2 inches. When you see a spec for chars/in, it's discussing ASCII characters, not their text equivalents.
  
  When you encode an alphanumeric character into a barcode, you're actually encoding the 2-digit ASCII code (in the case of X it would be 88). So 27 X's would be 54 8's, or around 2 inches. Add in the start/stop characters and the check digit, and you're talking around 2.25" for that barcode at 6.6 mins (27.6 c/i).
  
  If you were to create the same barcode with 27 1's, it would push the barcode into codeset C, which is a numeric-only standard that encodes each set of two ASCII characters as one character, so a numeric-only barcode would encode 27 characters, plus the start/stop and check digits, and would end up being around 1.25" wide.

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  Legacy Poster

  ★ BarTender Hero ★

  • 31. August 2012 18:41
  Mike T,
  Thank you for the very clear explanation.
  
  Ken

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