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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2019/03/12 18:01:00 UTC
[jira] [Commented] (PDFBOX-4484) Some JBIG2 images are corrupted
when subsampling is enabled
[ https://issues.apache.org/jira/browse/PDFBOX-4484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16790824#comment-16790824 ]
Tilman Hausherr commented on PDFBOX-4484:
-----------------------------------------
It happens in 2.0.14, but not in the trunk, so the jbig2 decoder is unlikely to be the culprit.
> 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
> Components: Rendering
> Affects Versions: 2.0.14
> 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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