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https://issues.apache.org/jira/browse/PDFBOX-5450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr resolved PDFBOX-5450.
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Resolution: Fixed
Note that this solves only the problem with actual transparency groups, not the
printing problems with patterns or transparent images.
> Create Opaque PDFRenderer example
> ---------------------------------
>
> Key: PDFBOX-5450
> URL: https://issues.apache.org/jira/browse/PDFBOX-5450
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.26
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.27, 3.0.0 PDFBox
>
>
> To solve the troubles from PDFBOX-4123 (low print quality of PDFs with
> unneeded transparency groups)
> As mentioned in the mailing list in [this
> thread|https://lists.apache.org/[email protected]:2022-3]
> {quote}
> Both options are related to transparency groups. These are an extension of
> XObject forms. I thought about ignoring them, i.e. treat them like ordinary
> forms.
> So I looked at PDXobject.createXObject(); this one is called by
> PDResources.getXObject(), which is called by DrawObject.process(). That one
> class can officially be replaced if you extend PageDrawer and call
> "addOperator(new DrawObject());" in the constructor; that class should have
> a slightly modified code that does NOT call showTransparencyGroup(), but only
> showForm() (there are 3 DrawObject classes, copy the one in
> org.apache.pdfbox.contentstream.operator.graphics). You can extend
> PageDrawer, but you'll have to extend PDFRenderer as well, see class comment
> of PageDrawer.
> {quote}
> and implemented by [~tresf] in [this
> commit|https://github.com/qzind/tray/blob/2a275bb729a3cf4b909fd683fbe23f7c1f8d4c2b/src/qz/printer/action/pdf/OpaquePDFRenderer.java].
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