QR Codes

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.

QRLite error: QrCode class not found, you may need to run "composer install".

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,

• checkable at the Special:Version#mw-version-ext,
• documented at mw:Extension:QRLite,
• or in source at gh:gesinn-it/QRLite.

QR Code Demo

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

QRLite error: QrCode class not found, you may need to run "composer install".

QRLite error: QrCode class not found, you may need to run "composer install".

PNG	QRLite error: QrCode class not found, you may need to run "composer install".	Plain & simple, https://replica-wiki.extremist.software/wiki/QR_Codes: {{#qrlite:{{fullurl:{{FULLPAGENAME}}}}|format=png|size=5|margin=0}} With #fragment, https://replica-wiki.extremist.software/wiki/QR_Codes#QR_Code_Demo: {{#qrlite:{{fullurl:{{FULLPAGENAME}}#QR_Code_Demo}}|format=png|size=5|margin=0}}
SVG	QRLite error: QrCode class not found, you may need to run "composer install".	{{#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}}

QR Code with border

QRLite error: QrCode class not found, you may need to run "composer install".

https://replica-wiki.extremist.software/wiki/QR_Codes

{|class="wikitable"
|{{#qrlite:{{fullurl:{{FULLPAGENAME}}}}|format=png|size=5|margin=0}}
|-
|{{fullurl:{{FULLPAGENAME}}}}
|}

Documentation

• The Wikipedia page on QR Codes is a decent overview.
• The ISO standard (208.00 CHF, ~$180 USD) developed by the original manufacturer, Denso Wave.
• Overview on Denso Wave's site

Generators

• QR Code Generator from the Zxing Project
• Call the Google Chart API with 'cht=qr'.

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

• Xerox PARC Dataglyphs - Embedding binary data inside of image dithering. Neat trick.