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https://issues.apache.org/jira/browse/PDFBOX-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17000383#comment-17000383
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Tres Finocchiaro commented on PDFBOX-4709:
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Providing the DPI only seems to make it worse.
I've found a way to emulate this issue...
The steps are fairly complex so please bear with me...
# Using Windows 10, install the latest ZDesigner driver from Zebra's website.
The driver chosen was "ZDesigner TLP 2884-Z" although any ZPL driver should
technically work.
# Using Google Chrome, install the Zpl Printer plugin. If not already, open
the Zpl Printer application and click it to "On".
# Manually add a new Standard TCP/IP printer port to the system with an IP
address of 127.0.0.1 (the OS took a long time to timeout and allow me to finish
the port addition, but it does eventually let you.
# Manually add a new printer to the system pointing it to the newly added
TCP/IP port.
# Select the ZPL driver (eg. TLP 2884-Z)
# From the newly added printer properties, go to Preferences, Options and
change the size to 4x6 inches (otherwise our example will throw
PrinterException("Paper's imageable height is too small.");
# Set the printer as the system's default printer.
Now you can print a virtual Zebra printer (this technique will technically work
on Linux or macOS, but the driver is written by Michael Sweet – not Zebra – so
it's not a great unit test).
Observe the printing quality difference between the unit tests provided in
Lite's code snippet. In my case, I'm using a font size of 8. Using 24 in the
code example hides the issue, you really need to use a smaller font to see it
with the naked eye.
> PDFBox prints text poorly in comparison to Adobe, Chrome, other apps
> --------------------------------------------------------------------
>
> Key: PDFBOX-4709
> URL: https://issues.apache.org/jira/browse/PDFBOX-4709
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.14
> Environment: Windows 10
> AdoptOpenJDK 11
> PDFBox 2.0.14
> Reporter: Lite M Finocchiaro
> Priority: Major
> Attachments: Adoberesult.jpg, Drug-print.pdf, Drug-print.pdf,
> IMG_20191219_130048_2.jpg, PDFBoxVSgraphicsobj.jpg, PDFBoxresult.jpg
>
>
> When printing a PDF from PDFBox to a Zebra GK420d thermal label printer, the
> text from the PDF is blurry and appears to have the top and bottom cut off
> compared to printing the same file through Adobe Acrobat.
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