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

             Summary: 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
         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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