![]() For example, 2:1, 3:1 and 2.5:1 are common ratios that describe the width of white spaces and black bars based on the starting point of the narrowest black bar. As a general rule, the margins should be at least seven to ten times the narrowest bar width in the barcode.Īll the other bars in the code are based off a ratio of the narrow bar width. ![]() A quiet zone or margin is the white space to the left and the right of the barcode this helps the reader to locate the barcode. The widths of the spaces and bars relate to a specific character in the barcode. In most cases, 1D barcodes are read from left to right. Each character in the code represents something different about the product and a database provides information on what each character means. These linear codes only contain alphanumeric data. Intelligent Mail encodes numeric characters.The first barcodes implemented worldwide were 1D (one-dimensional) barcodes. Not only do the width of the bars and spaces carry information, but so do the height and vertical location. Postal Service, this barcode encodes up to 65 characters.
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