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https://issues.apache.org/jira/browse/PDFBOX-4320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16624834#comment-16624834
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Christian Lauer commented on PDFBOX-4320:
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Regarding the strange blurred dots and lines: Your opinion is, that the buggy
jpeg2000 decoder of JAI is responsible for that?
> Weird spots in rendering result of scanned PDF 1.6 document
> -----------------------------------------------------------
>
> Key: PDFBOX-4320
> URL: https://issues.apache.org/jira/browse/PDFBOX-4320
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.11
> Reporter: Christian Lauer
> Priority: Major
> Labels: JPEG2000, JPG2000, JPXDecode, JPXFilter
> Attachments: scanned.pdf, weired.tiff
>
>
> The rendering of some scanned Documents in PDF 1.6 format result shows weired
> blurred black spots. It seems to me that the scanning software detects form
> areas and moves them in separate elements, which are not rendered by PDFBox.
> The result in Adobe Reader and other conversion tools like Image Magick
> (which is using ghostscript as PDF renderer) is absolute perfect. Besides the
> mentioned spots, there are some other rendering bugs resulting of wrong
> positioning of the graphical elements of the PDF.
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