This looks great! I also gave it a try, uploaded a transparent png (which was converted to black, fair enough, guess there's no good default choice for all case

This looks great! I also gave it a try, uploaded a transparent png (which was converted to black, fair enough, guess there's no good default choice for all cases) and scanned the pretty QR code with my phone: Flawless. Thanks for building and sharing this, I love to see QR codes become more readable