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Subject: Re: JBIG2 Images
To: users@pdfbox.apache.org
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From: Tilman Hausherr <THausherr@t-online.de>
Message-ID: <56E6F75E.3050900@t-online.de>
Date: Mon, 14 Mar 2016 18:39:42 +0100
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Am 14.03.2016 um 10:38 schrieb Felix Hermann:
> Hello,
>
> thanks for your advice.
>
> Another point: It seems that levigo is not thread-safe. When I used it with 5 threads, all five threads were blocked after about one hour. All threads were locked in HashMap.getEntry() (after calling a class of levigo).

Please open an issue here:
https://github.com/levigo/jbig2-imageio/issues

Tilman


>
> Regards
> Felix
>
>
>
>   
> -----Ursprüngliche Nachricht-----
> Von: Tilman Hausherr [mailto:THausherr@t-online.de]
> Gesendet: Mittwoch, 9. März 2016 19:07
> An: users@pdfbox.apache.org
> Betreff: Re: JBIG2 Images
>   
> Am 09.03.2016 um 15:11 schrieb Felix Hermann:
>> Hello,
>>    
>> we use PDFBox 2.0.0 for converting PDF to images.
>>    
>> We also want to support JBIG2 images. Therefore we would like to use
>> the JBIG2-Image-Decoder, which is proposed on your website. (See:
>> https://pdfbox.apache.org/2.0/dependencies.html[https://pdfbox.apache.org/2.0/dependencies.html] )
>>    
>> On your website it says: "These libraries are optional and will be loaded if present on the classpath, otherwise support for these image formats will be disable and a warning will be logged when an unsupported image is encountered."
>>    
>> I downloaded the source code, created a jar-file and put it onto the classpath.
>>    
>> However it didn't work. I'm getting the following error:
>>    
>> [09.03.2016 14:37:59] ERROR
>> org.apache.pdfbox.contentstream.PDFStreamEngine
>> (PDFStreamEngine.java:851) - Cannot read JBIG2 image: jbig2-imageio is
>> not installed
>>    
>> I also tried 'JBIG2 ImageIO' by 'levigo'. This worked. However we cannot use it, as it is under the GPL-Licence.
>   
> That is the reason why we don't distribute the levigo software.
>   
> Solutions for you:
> - Distribute your software without it and have your users download it
> - Write your own decoder (you could take the one in PDF.js and write it in java, it is Apache licensed)
> - Ask levigo for an apache license.
>   
> Tilman
>   
>>    
>> Any help will be appreciated
>>    
>> Regards
>>    
>> Felix
>>   
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