NCR 7800 - Bar Code Quality

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Bar-code readability depends on the quality of the label.
Although bad bar codes can often be read, the scanner cannot
read bar codes that are obstructed, defective, or damaged. If a
certain bar code cannot be read, inspect the bar-code label in
question and verify the quality of the label.
The readability of a label depends on variables such as sizing,
placement, color, paper type, ink viscosity, and package
coatings. The printing run can yield erroneous labels due to
the many variables involved. In particular, poor color contrast
and marginal print quality can make a label hard to read.
A UPC label should be considered readable if it meets or
exceeds the requirements set forth in the UPC Symbol
Specification put out by the UPC Council, Inc. and dated
March 1982, and the General Specification for Article
Symbol Marking, Copyright EAN-1977. The examples of bad
bar codes below are not inclusive.
R 0026
01 2 34 67 85 9
06
0123467859
06
0123467859
06
0123467859
06
Bar Code Quality