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https://issues.apache.org/jira/browse/PDFBOX-1570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13636490#comment-13636490
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Andreas Lehmkühler commented on PDFBOX-1570:
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No, transparency groups are described in chapter 11.4
http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/adobe_supplement_iso32000_1.pdf
> PDFImageWriter creates black boxes for some images in the pdf
> -------------------------------------------------------------
>
> Key: PDFBOX-1570
> URL: https://issues.apache.org/jira/browse/PDFBOX-1570
> Project: PDFBox
> Issue Type: Bug
> Components: Writing
> Affects Versions: 1.8.1
> Environment: Mac OSX
> Reporter: Florian Over
> Attachments: blackboxes.png, doo-erste-schritte.pdf
>
>
> After loading a pdf file and writing a Image with PDFImageWriter.writeImage
> the resulting image is on several parts black, where in the original pdf
> resides images.
> See examples.
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