On 08/03/2024 12:35, hw wrote:
On Thu, 2024-03-07 at 23:15 -0500, Jeffrey Walton wrote:I have a USB thermal printer for the shipping labels, <https://www.amazon.com/gp/product/B08V28J3JS>.This printer has only 300dpi. If you print QR-codes on it make sure you can scan them: they have to be large enough or get you an unscanable smear.
I believed that 300dpi is high enough resolution for QR-codes of reasonable size if source image has proper quality. On the other hand, if possible, it is better to scale QR-codes to match some whole factor of printer pixel size.