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A comment on Show HN: A Hand-Drawn QR Code Alternative. Parent comment

Re:Show HN: A Hand-Drawn QR Code Alternative by ryan-c on Monday July 27, 2015 @03:03PM (#9957274)
You can take it up to 11 like this: http://files.rya.nc/qr.png
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Re:Show HN: A Hand-Drawn QR Code Alternative by starshadowx2 on Monday July 27, 2015 @03:52PM (#9957589)
QR Codes can actually get pretty colourful and unique -

http://www.hongkiat.com/blog/qr-code-artworks/

http://techcrunch.com/2015/05/18/dotless-qr-codes/

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Re:Show HN: A Hand-Drawn QR Code Alternative by function_seven on Monday July 27, 2015 @03:28PM (#9957427)
I don't see anything on your blog about how that QR code can possibly work (I just scanned it, it does work, but my eyes tell me that's impossible)

You have any background on how that QR was constructed?

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Re:Show HN: A Hand-Drawn QR Code Alternative by ryan-c on Monday July 27, 2015 @04:07PM (#9957680)
The very short explanation:

* Split source image into red, green, and blue channels

* Run through the halftone qr generator[0]

* Recombine resulting QR codes into an RGB image

* Average combined QR codes with the source image

I'll probably post an article walking through the process using imagemagick some time next in August.

0. http://vecg.cs.ucl.ac.uk/Projects/SmartGeometry/halftone_QR/...

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