As a small, useless but fun hobby project, I wanted to try and draw something inside my EU Covid Pass QR certificate WITHOUT relying on error correction or rendering the digital certificate invalid.<p>TL;DR - some deflate misuse, mixed-mode alphanumeric and numeric QR encoding, mask choice override, padding the code with content that base45 encodes to numbers only and choosing them in a way to produce a meaningful image. Apparently, verifier apps are fine with it - every one I tried scans green.<p>This is a non-prod demo cert used for illustration of the concept with some funny images inside:<p>https://i.imgur.com/3JonSRX.png<p>Would there be any interest in me doing a post explaining how it was done?<p>Also, what else should I draw inside?
Neat. How about a pixel art that reads "Legit certificate of vaccination" in bad hand writing (like this[1]), but actually scans to a valid certificate?<p>TBH I didn't even notice the skull and syringe at first glance, just a QR code.<p>[1] <a href="https://papersplease.fandom.com/wiki/Jorji_Costava?file=Fake_passport_1160.png" rel="nofollow">https://papersplease.fandom.com/wiki/Jorji_Costava?file=Fake...</a> vs legitimate passports in the game: <a href="https://steamtradingcards.fandom.com/wiki/Papers,_Please_-_Passports?file=Papers_Please_Artwork_7.jpg" rel="nofollow">https://steamtradingcards.fandom.com/wiki/Papers,_Please_-_P...</a>