•1 No Quiet Zone
•2 Thin Bars not equal to Thin Spaces
•3 Poor Code Contrast - or Red Barcode !
•4 Missing Pixels (lines in middle of bars)
•5 Non Straight Edges
•6 Printing too close to code
•7 Less than 6 Digit ITF
•8 Wrong Code Code Table 128
•9 Code 39 too large
•10 Poor Aspect Ratio
Use these links to find best practice guides from GS1
Bar Coding Getting it Right Verification Implementation Ink Jet |