jbig2 requires special decoders that aren't part of iText.  At some point, I
intend to make the decoders extensible (so folks can register their own
decoders, even if iText doesn't provide it out of the box).  At this stage,
the stream bytes that PdfImageObject returns are valid jbig2 content (not
complete though, b/c JBig2 decoders have to also handle the 'globals' data -
see JBIG2GLOBALS, which is stored in a separate stream in the PDF).

Long and short, the simple extraction you are trying to do isn't going to
work with Jbig2.  You'll need to configure a jbig2 decoder with the globals,
then use PdfImageObject.getImageAsBytes() to get the raw bytes and run them
through the decoder.



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