Lexmark MX6500E User Manual download pdf (Page 4)

Optimizing bar code detection

Tips on scanning bar codes

• When scanning one-dimensional bar codes, position them horizontally to match the linear scaling of the bars.

• If patterns of text and specks are falsely detected as bar codes, then you can choose to ignore those areas, or you

can rescan the page.

• If the bar code is skewed on the page itself, then position the page in such a way that the bar code is aligned

horizontally or vertically with the scanner. This is particularly helpful when scanning two-dimensional bar codes,

such as PDF417, Data Matrix, and QR codes, which are harder to recognize than basic one-dimensional bar codes,

such as Code 3 of 9 and Code 128.

Tips on designing bar codes

• Increase the bar code font size to a more readable size.

• Make sure asterisks appear before and after the bar code characters. Asterisks are used as start/stop characters

for most linear bar codes.

• Make sure that only valid bar code characters are used within the data. An invalid character may be recognized as

a blank space, which will then result to having increased gaps between the bars.

• Make sure that there is enough contrast between the bar code and the color of the material you are printing on.

• Make sure to know the type, resolution, orientation, placement, and the number of bar codes on a document.

These are significant factors that can affect bar code detection.

• To prevent patterns of text and specks from appearing as bar codes in some documents, make sure to establish a

quiet zone (a clear area without any text or other marks) around the bar code.

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Lexmark MX6500E User Manual Page 4