c# - iTextSharp DataMatrix barcode capacity -

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i have specification implement datamatrix barcodes using 16x36 size. i'm using c# itextsharp library has barcodedatamatrix class.

given these barcode dimensions, specified capacities are:

  • numeric: 64
  • alphanumeric: 46
  • byte: 30

this taken site:

http://www.barcodephp.com/en/2d/datamatrix/technical

the requirement store 46 character string in 16x36 symbol.

i'm having hard time understanding how can encode 46 byte string in such way fits 30 bytes.


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