Am 14.03.2016 um 13:00 schrieb Felix Hermann:
Hello,
do you know a fast way to determine whether there are JBIG2-Images in a PDF document?
Search for /JBIG2Decode in the file.
Tilman
I want my program switch to another PDF-Tool in this case.
Regards
Felix
Gesendet: Montag, 14. März 2016 um 10:38 Uhr
Von: "Felix Hermann" <[email protected]>
An: [email protected]
Betreff: AW: JBIG2 Images
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).
Regards
Felix
-----Ursprüngliche Nachricht-----
Von: Tilman Hausherr [mailto:[email protected]]
Gesendet: Mittwoch, 9. März 2016 19:07
An: [email protected]
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[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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