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ja3250

How do PDF417 Rows work?


We are using your Java Solution for printing PDF417 barcodes and it works great. My question is about the Rows parameter. How does the Rows value affect the PDF417 bar code?

When I set the Columns value, the barcode contains that many columns. However, when I specify a value for Rows, the barcode never contains that many rows.

I would think the amount of data to be coded and the number of columns specified would determine how many rows end up in the barcode (Example 500 character to be coded using 2 columns would require a lot more rows than 500 characters and 20 columns).

I would never expect to specify 500 characters and 1 column along with 4 rows and I would never expect to specify 5 characters and 20 columns and 20 rows.

I would expect the number of rows to be determined by your program based on the other variables: amount of data, number of columns, compaction mode, etc.

I do not see how the rows variable could work in relation to the number of rows in the barcode.
Can you explain how specifying the number of rows affects the number of rows in the barcode?

Thanks

Operating System: AS400 OS V5R4

10-05-12     2512 day(s) ago    

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Ben

Best Answer

The number of Rows determines the number of modules vertically in a PDF417 barcode (the number rows in the encoded data is insignificant).

image

For example, setting PDFRows to 20, will create a PDF417 barcode with 20 modules (example image below):

image
In this example, I highlighted each module using yellow and blue marking.

If you had 500 values and set Columns to 2 and Rows to a higher amount such as 10, you would be required to modify the column to a larger number.

If the Rows and Columns are set to values that cannot accommodate the amount of data that you are encoding, the amount of Rows will increase, unless you increase the amount of Columns. The amount of data that determines the breaking point (change int Rows) depends on the encoding mode, the amount of data, and the Columns set--all explained in the PDF417 specification.

If unsure about the number of Rows and Columns, set them equal to zero (auto). This will build the most efficient PDF417 barcode.

Posted 2512 day(s) ago

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