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https://issues.apache.org/jira/browse/PDFBOX-81?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423008#comment-13423008
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Tilman Hausherr commented on PDFBOX-81:
---------------------------------------

Doesn't work with version 1.7.1 with the jbig2.jar file. However now there's an 
error message, although the function page.convertToImage() doesn't fail:
26.07.2012 12:21:13.521 ERROR [main] org.apache.pdfbox.filter.JBIG2Filter:73 - 
Can't find an ImageIO plugin to decode the JBIG2 encoded datastream.
26.07.2012 12:21:13.521 ERROR [main] 
org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap:186 - Something went 
wrong ... the pixelmap doesn't contain any data.
26.07.2012 12:21:13.521 WARN  [main] 
org.apache.pdfbox.util.operator.pagedrawer.Invoke:86 - getRGBImage returned NULL

When using levigo-jbig2-imageio-1.4.1.jar  I get this:
26.07.2012 12:50:46.677 ERROR [main] org.apache.pdfbox.filter.JBIG2Filter:77 - 
Something went wrong when decoding the JBIG2 encoded datastream.
26.07.2012 12:50:46.677 ERROR [main] 
org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap:186 - Something went 
wrong ... the pixelmap doesn't contain any data.
26.07.2012 12:50:46.677 WARN  [main] 
org.apache.pdfbox.util.operator.pagedrawer.Invoke:86 - getRGBImage returned NULL

                
> Excetion while extracting images
> --------------------------------
>
>                 Key: PDFBOX-81
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-81
>             Project: PDFBox
>          Issue Type: New Feature
>          Components: PDFReader
>    Affects Versions: 0.8.0-incubator
>            Priority: Minor
>              Labels: JBIG2
>         Attachments: COSName.java.diff, FilterManager.java.diff, 
> JBIG2Filter.java, jbig2_src.zip, pdfbox-81.PDXObjectImage.patch, 
> sigice9_172.Adobe.pdf, sigice9_172.CVISION.pdf
>
>
> [imported from SourceForge]
> http://sourceforge.net/tracker/index.php?group_id=78314&atid=552832&aid=1259747
> Originally submitted by guzzil on 2005-08-15 02:40.
> when trying to extract images from I pdf, i get exceptions  
> like  
> Exception in thread "main" java.io.IOException: Unknown  
> stream filter:COSName{JBIG2Decode}  
>         at  
> org.pdfbox.filter.FilterManager.getFilter(FilterManager.java:116)  
>         at  
> org.pdfbox.cos.COSStream.doDecode(COSStream.java:276)  
>         at  
> org.pdfbox.cos.COSStream.doDecode(COSStream.java:240)  
>         at  
> org.pdfbox.cos.COSStream.getUnfilteredStream(COSStream.java:173)  
>         at  
> org.pdfbox.pdmodel.common.PDStream.createInputStream(PDStream.java:205)  
>         at  
> org.pdfbox.pdmodel.common.PDStream.getByteArray(PDStream.java:458)  
>         at  
> org.pdfbox.pdmodel.graphics.xobject.PDPixelMap.getRGBImage(PDPixelMap.java:131)
>   
>         at  
> org.pdfbox.pdmodel.graphics.xobject.PDPixelMap.write2OutputStream(PDPixelMap.java:153)
>   
>         at  
> org.pdfbox.pdmodel.graphics.xobject.PDXObjectImage.write2file(PDXObjectImage.java:117)
>   
>         at  
> org.pdfbox.ExtractImages.extractImages(ExtractImages.java:169)  
>         at  
> org.pdfbox.ExtractImages.main(ExtractImages.java:73)  
>   
> The pdfs are scanned images, which are afterwards  
> optimized with Adobe Acrobats "optimize" function.  
>   
> pdfimages from xpdf can extract the images.  
>  
> I can send you a pdf with this error (it is to big for an 
> upload). 
> [comment on SourceForge]
> Originally sent by benlitchfield.
> Logged In: YES 
> user_id=601708
> yes please upload the pdf to ftp.pdfbox.org and I will take a 
> look at it.
> Ben Litchfield

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