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Barcode Density

Posted by Tom Graham on

Density of a barcode refers to how much space is required for the needed characters - typically how many characters per inch “CPI”. Factors that determine the density of a barcode: Symbology Type The ratio of wide to narrow elements X-Dimension

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Barcode Quiet Zone

Posted by Tom Graham on

Quiet zones Areas just before and after barcode These areas should be Same color as the spaces At least 10 times as wide as x-dimension Without the quiet zone the scanner is not able to read the code correctly - it doesn’t know where the barcode starts or ends.

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Barcode X-Dimension

Posted by Tom Graham on

X-Dimension is the width of the narrowest element (bar or space) in a barcode. It is measured in thousands of an inch call mils - 1000 mils is 1 inch. 5 mils means 5 thousandths of an inch. Here you can see two barcodes - on the left a 1D barcode with x-dimension of 10 mils and on the right a 2D barcode with x-dimension of 5 mils. Different scanners are able to read codes with different x-dimensions.

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Bar Width Ratios

Posted by Tom Graham on

Barcodes consist of bar and space elements. These bar and space elements can vary in width proportional to the narrowest element in the barcode. The difference between the wide and narrow elements is called bar width ratio. You can have up to 4 different bar width ratios in a single barcode, like with the Symbology Code 128.

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Barcode Check Digits

Posted by Tom Graham on

Check digits verify that the embedded barcode data is decoded correctly by the host system. The check digit is calculated from all the data characters in the barcode. Not all symbologies have a check digit - e.g. D2 of 5 doesn't Some symbologies give the option to include a check digit or not - e.g. Code 39 In some symbologies the check digit is automatically embedded in the barcode - e.g. UPC A

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