NCR 7890, User Manual

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Operating Your 7890 Scanner
Bar Code Quality
4-12 User’s Guide
The readability of a label depends on variables such as
sizing, placement, color, paper type, ink viscosity, and
package coatings. The middle of a printing run can
yield erroneous labels due to the many variants
involved. In particular, poor color contrast and marginal
print quality can make a label hard to read.
A 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.