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Posted to dev@pdfbox.apache.org by "Jani Pehkonen (JIRA)" <ji...@apache.org> on 2018/05/08 14:10:00 UTC

[jira] [Created] (PDFBOX-4211) Some text is missing in JBIG2 images

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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