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.