Missing 'Quiet Zone' Margin Causes QR Code Failures in Print, Not Preview

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A developer's QR code generator API produced codes that scanned correctly on screen but failed when printed on conference tickets. The failure occurred because printed codes lacked the required empty margin, known as the 'quiet zone', around the symbol. This margin is mandated by the QR code specification (ISO/IEC 18004) and is essential for scanners to locate the code's edges. The developer's testing showed that a margin of four modules ensured 100% successful scans. The API now defaults to including this necessary margin and warns users about similar issues with transparent backgrounds.

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