![]() We noticed that the first and the last bar are always 11 px (most certainly used along with the logo size to calibrate the scanner), so this leaves us with 21 bars × 3 bits per bar = 63 bits of information per barcode – clearly less than in a Spotify track ID, so some kind of a lookup table must be used. Here we can see that there's 8 variants for each bar: 11, 18, 25, 32, 39, 46, 53, and 60 pixels tall.
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