[ List Subjects ][ Post Message ]
[ View Followups ][ Post Followup ]

Date: 05/07/03 at 2:46 PM
Posted by: Jim Williams
E-mail: jim.williams@polyonics.com

In Reply to: Scanning of barcodes on colored background posted by CJ on 05/07/03 at 2:37 PM:

Bar codes scan based on the differences in absorption/reflectance of light, between the colors, at the wavelength of light used by the scanners. For example, some colors may look weird to you in visible light, but to an infrared scanner, they look literally "black and white". One of the keys is Print Contrast Signal, a ratio which measures the reflectance difference between the two contrasting colors chosen.

If you want specific examples of "good" and "bad" colors, go to . In the "Public Library" is a pdf document called "Colors for Barcode". It'll show you quite a few combinations.

Follow Ups:

  Re: Scanning of barcodes on colored background Jim   Posted at: 05/14/03 (0)

Post a Follow-up:

Name:
E-Mail:
Subject:

Message to Post: