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PDF417 2D barcode generator for Python

Project description

Easily encode your data into a 2D barcode using the PDF417 format.

Licensed under the MIT License, see LICENSE.

CLI

The pdf417gen command can be used to generate a barcode from commandline. Ittakes the input either as an argument or from stdin.

Usage

Creating bar codes is done in two steps:

• Encode a string to a list of code words using encode()
• Render the barcode using one of the rendering functions: render_image(),render_svg().

Usage overview:

Supports strings (unicode in py2) and byte arrays (str in py2):

Encoding data

The first step is to encode your data to a list of code words.

Columns

The bar code size can be customized by defining the number of columns used torender the data, between 1 and 30, the default value is 6. A bar code can have amaximum of 90 rows, so for larger data sets you may need to increase the numberof columns to decrease the rows count.

Security level

Increasing the security level will produce stronger (and more numerous) errorcorrection codes, making the bar code larger, but less prone to corruption. Thesecurity level can range from 0 to 8, and procuces 2^(level+1) errorcorrection code words, meaning level 0 produces 2 code words and level 8produces 512. The default security level is 2.

Auto Numeric Compaction Mode

This mode can pack almost 3 digits (2.93) info a symbol character.The words with length less 13 symbols will be invoked as Text

Render image

The render_image function takes the following options:

• scale - module width, in pixels (default: 3)
• ratio - module height to width ratio (default: 3)
• padding - image padding, in pixels (default: 20)
• fg_color - foreground color (default: #000000)
• bg_color - background color (default: #FFFFFF)

Note

A module is the smallest element of a barcode, analogous to a pixel. Modulesin a PDF417 bar code are tall and narrow.

The function returns a Pillow Image object containing the barcode.

Colors can be specified as hex codes or using HTML color names.

Render SVG

The render_svg function takes the following options:

• scale - module width, in pixels (default: 3)
• ratio - module height to width ratio (default: 3)
• padding - image padding, in pixels (default: 20)
• color - foreground color (default: #000000)

The function returns a ElementTree object containing the barcode in SVG format.

Unlike render_image, this function does not take a background color option.The background is left transparent.

See also

• pdf417-php - a PHP implementation
• golang-pdf417 - a Go implementation
• Specifications - USS-PDF-417

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0.8.1

Online Pdf417 Barcode Generator

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0.7.2

0.7.1

0.7.0

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