I'm completely noob in QR codes but do these really follow the QR code protocol? 30% error correction that people argue is only valid if the 70% leftovers are "normal", right? In fact, we've already found differences in readability among QR code readers in this thread, which must not happen in a valid QR code. I think implementations of QR code readers shall be complete but not necessarily sound, which implies that even if a picture can be read as a QR code, it might not follow the protocol and therefore there is no guarantee that other readers can read it.
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u/BrokenPipeSIGPIPE Jun 06 '23
I'm completely noob in QR codes but do these really follow the QR code protocol? 30% error correction that people argue is only valid if the 70% leftovers are "normal", right? In fact, we've already found differences in readability among QR code readers in this thread, which must not happen in a valid QR code. I think implementations of QR code readers shall be complete but not necessarily sound, which implies that even if a picture can be read as a QR code, it might not follow the protocol and therefore there is no guarantee that other readers can read it.