This is a different method than using error correction that allows for more usable area (see details in other threads.) It still leaves 7% of the ECC intact so

This is a different method than using error correction that allows for more usable area (see details in other threads.) It still leaves 7% of the ECC intact so you can further modify the code after it is generated. I had to modify a few pixels still to embed another QR code inside a QR code (and have both scan!) http://designerqrcodes.wordpress.com/designer-qr-code-art-gallery/qrinqr/ http://designerqrcodes.wordpress.com/designer-qr-code-art-ga...