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@blinry @piko To follow the talk was quite fun. Most probably I will never try to decode a QR code by hand.

Regarding the separators. It's mentioned there need to be empty lines around the finder pattern, highlighted on two sides. When I place the QR code on a black background it cannot be scanned any more.

* Has a QR code always to be placed on a white/light background?
* Must empty lines surround the whole finder patterns?
* Is it just a weakness in the QR code readers?
* What do I miss?