ITF-14
ITF-14 (or ITF) is a variant of the Interleaved 2 of 5 barcode with its specification defined by GS1. ITF is a larger code intended for use on the outside of packing cases and scanning a distance. In this form it most commonly uses the same data as EAN-13 but with a LEADING 0. If a check digit is calculated by dBarcode for this code then the EAN-13 check digit is produced.
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The horizontal bars supporting the bars of the barcode are called Bearer Bars, and these are recommended rather than mandatory.
dBarcode can produce the bearer bars at any size, although the normal size recommended is about 5 mm. This size is largely historical and allowed for the spreading of pressure during metal plate printing; the actual size has no effect on the scanning of the barcode. An Extra option is provided for producing the vertical bearer bars at the same thickness and these may be obtained by checking the EXTRA1 checkbox in applications, or setting the flags parameter bit DL_FLAG_EXTRA1 (bit 4 of the flags variable) or BarCode.Extra1 in the OCX.
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Similarly dBarcode does not normally include the optional H printer gauge marks (nor the accompanying extra light margin space), because these were also features of older printing technologies, designed to check for impression depth and ink spread. If the H gauges are required they may be obtained by checking the EXTRA2 checkbox in applications, or setting the flags parameter bit DL_FLAG_EXTRA2 (bit 5 of the flags variable) or BarCode1.Extra2 in the OCX.
Note that these ITF codes are not the same library selection as Interleaved 2 of 5 (I-2of5)
ITF-6