Compact PDF417, or Compact
Portable Data File 417, has the same features as
PDF417 standard. However, Compact PDF417 may be used where space
considerations are a primary concern and symbol damage is unlikely. In an
environment where label damage is unlikely (e.g. an office), the right row
indicators, that PDF417 Symbols feature, may be omitted and the stop pattern
may be reduced to one module width bar. This procedure reduces the non-data
overhead from 4 codewords per row to 2 codewords per row, with some trade-off
in decode performance and robustness, or the ability to withstand noise,
damage, degradation, dust etc. This overhead reduction version is called
Compact PDF417, which is fully decoder compatible with standard PDF417.
NOTE: In the original AIM USA (1994) and AIM Europe (1994) PDF417
specifications, the term Truncated PDF417 has been used in a technically
synonymous manner. The name Compact PDF417 is preferred to avoid confusion with
the more general use of the term 'truncated'.
Sample of a Compact PDF417 Barcode
In order to get a Compact PDF417 barcode image, please follow
these steps:
-
Set the Symbology property to CompactPdf417
-
Set the Pdf417CompactionType property to:
-
Text:
It allows encoding all printable ASCII characters, i.e. values from 32 to 126
inclusive in accordance with ISO/IEC 646, as well as selected control
characters such as TAB (horizontal tab ASCII 9), LF (NL line feed, new line
ASCII 10) and CR (carriage return ASCII 13).
-
Binary:
It allows encoding all 256 possible 8-bit byte values. This includes all ASCII
characters value from 0 to 127 inclusive and provides for international
character set support.
-
Numeric:
It allows efficient encoding of numeric data strings.
-
Auto: It switches between Text, Binary and Numeric modes in order to
minimize the number of codewords to be encoded.
-
Set the Pdf417ErrorCorrectionLevel
property. ISO/IEC standards recommend a minimum error correction level of 2.
-
Setting up dimensions and quiet zones:
-
In our PDF417 implementation the BarHeight property is calculated as BarWidth
* BarRatio
-
Set the BarWidth
property (Value is expressed in Inches)
-
Set the BarRatio property to an integer greater than or equal to 3
-
Set the Pdf417Rows property to a value ranging from 3 to 90.
Specify zero (0)
so that BarcodeItem can determine it automatically.
-
Set the Pdf417Columns property to a value ranging from 1 to 30.
Specify zero (0)
so that BarcodeItem can determine it automatically.
-
Set the QuietZone
property to double of BarWidth (Value is expressed in Inches)
-
(Optional) Set the Pdf417AspectRatio property to a value ranging from 0
to 1. It's the ratio of the height to the overall width of the symbol.
NOTE: For Pdf417AspectRatio property takes effect, Pdf417Rows and
Pdf417Columns properties must be set to 0 (zero).
-
Set the Code property with the value to encode.
