QR Codes

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Revision as of 21:58, 6 December 2023 by Mcint (talk | contribs) (adding QR extension instructions to header, checking if visible in mouseover previews)
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QR Codes are two-dimensional barcode graphics that can encode arbitrary binary data and we use QR code stickers to label things at Noisebridge!

Stick one on a physical object encoding a link to a page that can be configured to 301 to arbitrary URLs (e.g. https://www.noisebridge.net/qr/07A72C23A7), and you get a system for hardlinking physical objects into cyberspace.

You can embed a QR code for any page on the wiki, of its own URL, by including this snippet on the page:

  • QR code embed snippet: {{#qrlite:{{fullurl:{{FULLPAGENAME}}#section-fragment}}|format=png|size=5|margin=0}}, prefix with a <br> to set it on its own line.
  • Include the text of the link, <br>{{fullurl:{{FULLPAGENAME}}}}, in text near the image, for the others' clarity when browsing & for printing.


Extension:QRLite, on this wiki

You can embed a QR code for any page on the wiki, of its own URL, by including this snippet on the page:

  • QR code embed snippet: {{#qrlite:{{fullurl:{{FULLPAGENAME}}#section-fragment}}|format=png|size=5|margin=0}}, prefix with a <br> to set it on its own line.
  • Include the text of the link, <br>{{fullurl:{{FULLPAGENAME}}}}, in text near the image, for the others' clarity when browsing & for printing.

QR codes are generated by the "QRLite" extension on this wiki,

QR Code Demo

Here's the new QR codes (and also some styling of the URL#fragment link target). Go wild!

PNG
{{#qrlite:{{fullurl:{{FULLPAGENAME}}}}|format=png|size=5|margin=0}}
{{#qrlite:{{fullurl:{{FULLPAGENAME}}#QR_Code_Demo}}|format=png|size=5|margin=0}}
SVG

{{#qrlite:{{fullurl:{{FULLPAGENAME}}}}|format=svg|size=5|margin=0}}
View/include the link nearby
<br>{{fullurl:{{FULLPAGENAME}}}}

For external URLs, here's the syntax:

 {{#qrlite:https://example.com/|format=svg|size=5|margin=0}}


Documentation

Generators

Software

  • Zxing Project appears to be a Google-blessed software library written in Java for processing one-dimensional and two-dimensional barcodes. It is written for use on mobile phones.
  • Snappr.net has an image-attched-to-email-to-text type gateway setup. snappr [at] snappr.net More info on their page

Other 2D Encodings