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From "Tilman Hausherr (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-4320) Weird spots in rendering result of scanned PDF 1.6 document
Date Sat, 22 Sep 2018 21:15:00 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-4320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16624839#comment-16624839

Tilman Hausherr commented on PDFBOX-4320:

Thanks, now I see it... That too is a result of that bug.

To see the image in the PDF displayed by java, start PDFDebugger and go to {{Root/Pages/Kids/[0]/Resources/XObject/ImagePart_3555,
and there's the same effect.}}

{{{color:#333333} I extracted the image and displayed it with IrfanView and it looks OK. You
can try loading the image with ImageIO and then saving as PNG and you'll see the same effect.{color}}}

> 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: PDFBOX-4320.jp2, 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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