Custom QR Codes - Structure

Knowing the structure behind QR codes helps when designing a custom QR code that will scan properly
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four different types of qr code in black and white, each with an individual's own image
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a qr code that is yellow and white with black squares on it, in front of a black background
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the qr code is shown in black and white, with an arrow pointing to it
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the qr code is shown in this screenshote, and it appears to be an image
QR Code Structure