"Sample PDF417.png" is a nonsensical PDF417 symbol as it contains only pad characters and no data. Please replace with a symbol that contains valid data. See example image linked at right that adheres to the PDF417 standard and is available to the public at Wikimedia Commons.
Sample of a PDF417 symbol encoding "PDF417 is a stacked linear barcode symbol format used in a variety of applications, primarily transport, identification cards, and inventory management." When printed at 200 DPI the symbol will be 1.75 inch x 0.76 inch. The symbol is encoded using Error Correction Level 5, with 6 Columns and 24 Rows (144 Codewords). It contains 80 Data Codewords and 64 Check Codewords.
