[jira] [Resolved] (PDFBOX-5450) Create Opaque PDFRenderer example

["Tilman Hausherr (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-5450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tilman Hausherr resolved PDFBOX-5450.
-------------------------------------
    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/list?users@pdfbox.apache.org: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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