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From "Jani Pehkonen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PDFBOX-4211) Some text is missing in JBIG2 images
Date Tue, 08 May 2018 14:10:00 GMT

     [ https://issues.apache.org/jira/browse/PDFBOX-4211?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jani Pehkonen updated PDFBOX-4211:
    Attachment: EncodedTable.patch

> Some text is missing in JBIG2 images
> ------------------------------------
>                 Key: PDFBOX-4211
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4211
>             Project: PDFBox
>          Issue Type: Bug
>          Components: JBIG2
>    Affects Versions: 2.0.9
>            Reporter: Jani Pehkonen
>            Priority: Major
>         Attachments: EncodedTable.patch
> [This PDF|http://library.sciencemadness.org/library/books/unitized_experiments_in_ochem.pdf]
has problems.
> See pages "iii" (2), "ix" (6), "x" (7) etc. These pages have most of their text missing
or in wrong position when rendered in PDFDebugger. Each page is a JBIG2 image that uses Huffman
encoding. You may need to use for example -Xmx1000M to avoid OutOfMemoryError because the
JBIG2 images are very large.
> Apply my patch to file EncodedTable.java in package org.apache.pdfbox.jbig2.decoder.huffman.
I have fixed one line of code that does not follow the JBIG2 standard. 
> The JBIG2 standard is freely available [here|https://www.itu.int/rec/T-REC-T.88-200002-I/en]

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