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https://issues.apache.org/jira/browse/PDFBOX-4245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr resolved PDFBOX-4245.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.0.0 PDFBox
                   2.0.12

Thank you [~kunhart], not only this fixed the bug, but it shorted the code as 
well.

> wrong rendering of the transparency group at the specific position on a page
> ----------------------------------------------------------------------------
>
>                 Key: PDFBOX-4245
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4245
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.10
>            Reporter: Jiri Kunhart
>            Assignee: Tilman Hausherr
>            Priority: Major
>              Labels: patch
>             Fix For: 2.0.12, 3.0.0 PDFBox
>
>         Attachments: gs-bugzilla690022-reduced-rotations-cropbox.pdf, 
> gs-bugzilla690022-reduced-rotations.pdf, gs-bugzilla690022.pdf, 
> pdfbox-2.0.10-SNAPSHOT_transparency_group_all.patch, 
> pdfbox-2.0.10-SNAPSHOT_transparency_group_resources.zip, 
> pdfbox-2.0.10-SNAPSHOT_transparency_group_sources.patch, 
> pdfbox-2.0.10-SNAPSHOT_transparency_group_sources_2.patch, 
> pdfbox-2.0.12-SNAPSHOT_transparency_group_sources.patch, 
> pdfbox-3.0.0-SNAPSHOT_transparency_group_sources.patch
>
>
> The rendering of the transparency groups works only if the whole page is 
> rendered. If you try to render only a part of the page where is a 
> transparency group placed, you will get only the white image or an image with 
> shifted pixels representing applied soft mask. The simple fix is attached in 
> the patch, including the test and the resources used for testing.



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