Quiet: It refers to the limited area where the reflectivity at the outer ends or
middle of the barcode is the same as that of the space. The actual width of
the Quiet area is a scale of the narrow bar width multiplied by the Quiet area.
Blank：When the barcode is reversed, you can specify the size of the blank
area around the barcode.
Bar Barcode Height: the height of the barcode.
Standard Width: It refers to the width of the narrowest bar, i.e. the width of
the unit bar. Commonly a one-dimensional barcode consists of bars and
spaces with four types of width respectively, and 1, 2, 3 and 4 refer to 1, 2, 3
and 4 times the width of the unit bar as per the width size of bars and spaces.
The width of the narrow bar means the width of one unit bar.
Refers to the width of the narrowest strip module, that is, the width of the
reference strip module
The actual width of Bar 2 is a scale of the narrow bar width multiplied by the
width of Bar 2, and the method applies for Bar 3 and 4.
The actual width of Space 1 is a scale of the narrow bar width multiplied by
the width of Space 1, and the method applies for Space 2, 3 and 4.
Blank：A limited area with the same reflectivity as the space on the outside
or in the middle of the left and right ends of the barcode，The actual width of
the blank area is equal to the width of the narrow strip module multiplied by
the proportion of the blank.
4.8.2.2. Two-Dimensional Barcode
4.8.2.2.1. PDF417 Barcode
PDF is the abbreviation of the Portable Data File. Figure 4-21 is the
demonstration of PDF417 Barcode.
PDF is the acronym of the three words "Portable Data File", meaning
"Portable Data File". Figure 4-21 is the demonstration of PDF417 Barcode.
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