On Mon, 2024-03-11 at 23:45 +0700, Max Nikulin wrote:
> On 11/03/2024 08:06, hw wrote:
> > On Sun, 2024-03-10 at 09:50 +0700, Max Nikulin wrote:
> > > On 10/03/2024 04:41, hw wrote:
> > > > \psbarcode{textblah foo}{height=0.6 width=0.6 eclevel=L}{qrcode}
> > > >
> > > > That works for 600dpi laser printers. When you print the QR-code with
> > > > a 300dpi label printer you can't reliably scan it, not even when you
> > > > make the QR-code 1x1" in size.
> > > >
> > > > Perhaps that's not a reasonable size?
> > >
> > > Perhaps height and width are chosen improperly. An image some percents
> > > smaller may be sharper.
> >
> > What size do you consider reasonable?
>
> It seems you expect some number that you can use for any QR code. There
> is no size that fits for all codes.
It's because you said: "I believed that 300dpi is high enough
resolution for QR-codes of reasonable size if source image has proper
quality." that I keep asking what you consider a reasonable size.
> Out of curiosity I tried to scan a QR code printed on a thermal printer
> (so likely having ~200dpi resolution) having size of approximately 0.8in
> and 50 pixels (modules) per inch. It encodes a 69 bytes long link.
> Likely the same code scaled to 0.4in will still work, but I would prefer
> to avoid it, 0.6in should be more reliable. On your 300dpi printer this
> particular QR code may be printed e.g. at ~(0.8/1.5)in.
Did you successfully scan it?
> > [...]
> > The QR-code must fit on the label, plus some text. The labels are
> > 50x35mm in size.
>
> It limits amount of information you may put into QR codes. You can still
> choose to use e.g. 4,5,6, etc. printer dots per QR code module.
How can I choose that? I don't know that there would be an option
with pdflatex or pdf or the printer driver that would let me choose
how many dots per module the printer puts onto the label.
> > When I zoom in on QR-codes in a PDF viewer, they don't get blurry.
> > Perhaps the pst-barcode package uses vector graphics?
>
> Nice, however you have to adjust size to avoid blurring.
How do you mean? I thought vector graphics don't blur when scaled.
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