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https://issues.apache.org/jira/browse/PDFBOX-4435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16746286#comment-16746286
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Tilman Hausherr commented on PDFBOX-4435:
-----------------------------------------
I suspect this: the QR code is an RGB image and has /Interpolate set. So java
interpolates and creates some colors between black and white. This looks weird
on a b/w printer. So what you could do:
- convert the QR image to a b/w image
or
- don't print directly, instead use PDFBox to convert to a b/w image (there is
an option for this) and print that image
or
- modify PDFBox so that in PageDrawer.java, force
{{graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);}}
or
- remove the interpolate setting from the QR code
or
- change PDFPrintable so that when dpi is non zero, a bitonal image is used and
not an ARGB image
> 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
>
>
> 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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