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How to print a good barcode

Here is an example for how to print a good barcode and how to select a correct printer.
EAN/UPC On-Demand Printed Symbols at Minimum Size.
It is more difficult for the user to create high quality bar code symbols with general-purpose printers than it is with direct thermal transfer label printers. There are two reasons for this difficulty. First, the printed dot size for general-purpose printers is appreciably larger than the pixel dimension, as shown in below image. This causes the bars (dark bars) to be printed wider and the spaces (light bars) to be narrower than nominal, unless the software driving the printer corrects for this distortion. Second, the software that constructs the bar code may itself introduce dimensional errors.

 

Example of Digital Printing