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In the era before smartphones, barcode readers were highly tuned devices that emitted a specific frequency of light and the sensor was tuned for exactly that. C
by jldugger 3y ago
In the era before smartphones, barcode readers were highly tuned devices that emitted a specific frequency of light and the sensor was tuned for exactly that. Cellphone screens generally don't emit that frequency of red, and I guess absorb rather than reflect light sent to it, making the screen opaque.
So even if you, the human, can read it doesnt mean the device that authorizes you can.
- lxgr 3y agoDefinitely, but what I mean is that that's not a failure mode specific to Apple passes. If a screenshot a barcode works, so should the pass, and vice versa.
- jldugger 3y agoStill seems like a waste of time if your MVP fails tho.
- lxgr 3y agoIt's not too hard to imagine other use cases for 2D barcodes in Passbook/Wallet, even if one specific library does not work out. Loyalty cards at retailers come to mind, for example. POS systems often support scanning coupons from phone screens.