this post was submitted on 14 Jan 2026
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Chapotraphouse
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The ability to correct generally means the amount of squares that can have their value flipped (bit error) without changing the message. This can be changing white -> black or black -> white with identical results. If you want to know more about how it works, the article it links about Reed-Solomon error correction goes into more detail about the algorithm.
Still not a good way to solve this issue, but QR codes (and other codes like it) are ubiquitous for good reason.
Thank you for the explanation. A lot of the maths goes over my head, but your posts and articles have helped me understand how they work a bit better and answered a long-standing question I had.