On: Everyone knows your location: tracking myself down...

[claw-el]

I believe some apps actually have to automatically brighten up your screen when displaying a QR code for scanning, and then reduce back the brightness of its previous setting when moving out of the QR code. I believe the Whole Foods app does this for its first screen.

[emaro → claw-el]

Surely that could be done without sending the brightness to some 3rd party.