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From "Pete Nattress (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PDFBOX-4484) Some JBIG2 images are corrupted when subsampling is enabled
Date Tue, 12 Mar 2019 15:48:00 GMT

     [ https://issues.apache.org/jira/browse/PDFBOX-4484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Pete Nattress updated PDFBOX-4484:
    Attachment: test-jbig21-subsampling.jpg

> Some JBIG2 images are corrupted when subsampling is enabled
> -----------------------------------------------------------
>                 Key: PDFBOX-4484
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4484
>             Project: PDFBox
>          Issue Type: Bug
>            Reporter: Pete Nattress
>            Priority: Minor
>         Attachments: test-jbig2.pdf, test-jbig21-no-subsampling.jpg, test-jbig21-subsampling.jpg
> We have observed problems when rendering some PDFs containing JBIG2 images if the subsampling
option is enabled.
> It is possible to reproduce this with the file I have attached using the CLI:
> {code:java}
> $ java -jar pdfbox-app-2.0.14.jar PDFToImage -subsampling test-jbig2.pdf
> Mar 12, 2019 3:17:09 PM org.apache.pdfbox.pdmodel.graphics.image.SampledImageReader from1Bit
> WARNING: premature EOF, image will be incomplete
> {code}
> In the output, the extracted image is distorted and has incorrect dimensions. This does
not appear to affect all JBIG2 images, for instance the file "ItDoesntWorkScan.pdf" attached
to PDFBOX-1067 contains a JBIG2 image and is rendered correctly with the above code. PDFs
containing images encoded with algorithms other than JBIG2 also appear to be OK, although
I haven't tested this exhaustively.
> We have worked around this problem for now by disabling the subsampling option.

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