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https://issues.apache.org/jira/browse/PDFBOX-4435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16746577#comment-16746577
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Tres Finocchiaro commented on PDFBOX-4435:
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<quote>I can confirm the label prints fine when converting it to an image first
as per your last comment and printing via OS. My issue is we indirectly use
PDFBox though QZ-Tray for printing which means I've got no control over how the
printing of this PDF is handled internally. I'll raise a ticket with them and
see if they can make use of any of the suggestions here.</quote>
The 3rd party app uses the PDFBOX API directly. Coercing a good black/white
image through a 600dpi command line render won't make it into the 3rd party
product (I'm the developer). We're always willing to add flags (or a code
shim) to fix and/or advanced API settings, but the issue here appears to be
that the PDF is force PDFBOX to a rasterized print which needs to be fixed
either in the PDF or in the render.
> 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
> Attachments: 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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