Pete Nattress created PDFBOX-4484:
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Summary: 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
Attachments: test-jbig2.pdf
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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