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?
> - Find the dpi value in the specs of your printer
300dpi
> - Find number of pixels in QR code in QR specs (or just calculate them)
Calculate them how or find them where? Pdflatex somehow does it and
the QR-codes are fine when printed on a laser printer and when shown
on a 4k display.
> - Specify width and height so that the ration of 2 numbers above is a
> whole number.
>
> Image may become a bit larger or a bit smaller.
The QR-code must fit on the label, plus some text. The labels are
50x35mm in size.
That limits the QR-code to about 1x1", give or take a few mm. 1" is
already half the width of the label which doesn't leave much room for
text, and you have to give it some slack because you want to end up
printing somewhere on the label and not on the gaps between the
labels.
When I zoom in on QR-codes in a PDF viewer, they don't get blurry.
Perhaps the pst-barcode package uses vector graphics?
'pdfimages -list' doesn't show any images for a PDF with QR-codes
created with pdflatex.
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