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From "Christian Lauer (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 20:58:00 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-4320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16624832#comment-16624832

Christian Lauer commented on PDFBOX-4320:

If you for example take a close look at the second occurrence of the word "Postleitzahl" you'll
notice that the first occurrence of the letter "l" is corrupted, as well as the following
"e". There are several other bugs like this.

> 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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