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https://issues.apache.org/jira/browse/PDFBOX-4435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16748375#comment-16748375
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Tilman Hausherr commented on PDFBOX-4435:
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You could try… my feeling is that it is unfixable, because it's the only way to
pass the transparency, which is why I haven't attempted to report it myself,
although I recently got a more direct access to their bug tracker. Maybe it's
different for a paid subscriber.
The speed and the rasterization are the same problem IMHO, see also
https://blog.idrsolutions.com/2012/05/avoid-transparency-when-printing-in-java/
And I searched again today, and maybe it is a industry-wide problem:
https://stackoverflow.com/questions/6286665/what-causes-wpf-printer-output-to-be-rasterized
If possible I'd like to see the file you mention.
> Poor quality printing of PDF label
> ----------------------------------
>
> Key: PDFBOX-4435
> URL: https://issues.apache.org/jira/browse/PDFBOX-4435
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.3, 2.0.13, 2.0.14
> Environment: Lubuntu 16.04, GK420d printer, CL-S400DT(Z) printer
> Reporter: David Hancock
> Priority: Major
> Fix For: 2.0.14, 3.0.0 PDFBox
>
> Attachments: before_after.png, comparison.png, label-pdfbox-1-8.jpg,
> label-pdfbox-2-0.jpg, label.pdf, label.png
>
>
> Hello,
> I'm experiencing poor quality printing of PDF courier labels with PDFBox when
> printing from the command line with the following command:
> {noformat}
> java -jar pdfbox-app-*.jar PrintPDF label.pdf
> {noformat}
> This makes scanning the QR code on these labels troublesome.
> I've tried versions 2.0.3, 2.0.13, 2.0.14 (SNAPSHOT) and all produce the same
> quality issue. Interestingly version 1.8.16 does not appear to suffer from
> this issue.
> I have tried 2 different thermal printers, a GK420d and a CITIZEN
> CL-S400DT(Z) and both output the same.
> When printing the label directly from the GNOME document viewer (Evince) the
> label prints clearly on both printers.
> Please find examples of these labels attached.
> Can anything be done to prevent these quality issues?
> Thanks,
> David
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