our company is looking to publish a desk calendar with a QR code. I know how to generate QR's, but do I need it to be a certain "resolution" or whatever if it's going to go through a professional printer? Thx!
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Like anything, a printed QR code needs to have a certain resolution. For good results it should have at least 300 dpi to look sharp.
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There are actually different error correction levels defined in the QR code algorithm. The idea is to include additional data in the QR code in case it's hard to read or partially damaged.
The resolution is less important, as long as the code is readable. QR code were designed exactly for this purpose. They should be easily readable to provide a Quick Response.
Also, make sure to pick a version and size that is appropriate for your data. Using a version 40 code to hold 40 characters makes no sense. Pick the lowest possible values that are sufficient to hold your data. But keep in mind that the error correction data has to fit into it as well.