Re: JBIG2 Pdf?

[Andreas Lehmkuehler <an...@lehmi.de>]

Hi,

Am 03.02.2011 02:49, schrieb Kenneth Berland:
> Andreas,
>
> I can't make pdfbox decompress jbig2 encoding images anymore. Do you have a
> sample pdf and java code that works?
>
> I had it working in September when I submitted the patch,
> https://issues.apache.org/jira/browse/PDFBOX-81, but, for the life of me, I
> don't know what has changed. I've tried with pdfbox-1.4.0 and my patches to
> 1.2.1. I'm thinking that my sample file is bad?
Did you add the ImageIO-plugin [1] to yout classpath?

BR
Andreas Lehmkühler

P.S.: Please use the mailing lists to discuss PDFBox topics.

[1] http://code.google.com/p/jbig2-imageio/

Re: JBIG2 Pdf?

[Kenneth Berland <ke...@hero.com>]

The problem is that no decompressed data is returned in JBIG2Filter.java 
by:

BufferedImage bi = ImageIO.read( compressedData );

bi is always null, so there is no error condition, but also no work done. 
It seems to me that decompressing JBIG2 is more complicated than passing 
the compressedData to imagio.  Thereis a good amount of data at 
COSDictionary options, namely:

COSDictionary{(COSName{ColorSpace}:COSName{DeviceGray}) 
(COSName{Subtype}:COSName{Image}) (COSName{Filter}:COSName{JBIG2Decode}) 
(COSName{Length}:COSInt{32219}) (COSName{Width}:COSInt{2840}) 
(COSName{Type}:COSName{XObject}) (COSName{BitsPerComponent}:COSInt{1}) 
(COSName{Height}:COSInt{3658}) } filterIndex: 0

and I suspect the decoder needs this data to perform properly.  A cursory 
look at http://www.verypdf.com/document/pdf-format-reference/pg_0080.htm 
also influences my opinion.

-KB



On Thu, 3 Feb 2011, Kenneth Berland wrote:

> Yes, I did.  I confirm this by placing the following code in 
> JBIG2Filter.java:
>
> for ( int idx=0; idx < myStringArray.length; idx++){
>  System.out.println( myStringArray[idx] );
> }
>
> This yields:
>
> BMP
> jpeg
> WBMP
> GIF
> jpg
> bmp
> jbig2
> JPG
> wbmp
> png
> JBIG2
> PNG
> JPEG
> gif
>
> -KB
>
>
> On Thu, 3 Feb 2011, Andreas Lehmkuehler wrote:
>
>> Hi,
>> 
>> Am 03.02.2011 02:49, schrieb Kenneth Berland:
>>> Andreas,
>>> 
>>> I can't make pdfbox decompress jbig2 encoding images anymore. Do you have 
>>> a
>>> sample pdf and java code that works?
>>> 
>>> I had it working in September when I submitted the patch,
>>> https://issues.apache.org/jira/browse/PDFBOX-81, but, for the life of me, 
>>> I
>>> don't know what has changed. I've tried with pdfbox-1.4.0 and my patches 
>>> to
>>> 1.2.1. I'm thinking that my sample file is bad?
>> Did you add the ImageIO-plugin [1] to yout classpath?
>> 
>> BR
>> Andreas Lehmkühler
>> 
>> P.S.: Please use the mailing lists to discuss PDFBox topics.
>> 
>> [1] http://code.google.com/p/jbig2-imageio/
>

Re: JBIG2 Pdf?

[Kenneth Berland <ke...@hero.com>]

Yes, I did.  I confirm this by placing the following code in 
JBIG2Filter.java:

for ( int idx=0; idx < myStringArray.length; idx++){
   System.out.println( myStringArray[idx] );
}

This yields:

BMP
jpeg
WBMP
GIF
jpg
bmp
jbig2
JPG
wbmp
png
JBIG2
PNG
JPEG
gif

-KB


On Thu, 3 Feb 2011, Andreas Lehmkuehler wrote:

> Hi,
>
> Am 03.02.2011 02:49, schrieb Kenneth Berland:
>> Andreas,
>> 
>> I can't make pdfbox decompress jbig2 encoding images anymore. Do you have a
>> sample pdf and java code that works?
>> 
>> I had it working in September when I submitted the patch,
>> https://issues.apache.org/jira/browse/PDFBOX-81, but, for the life of me, I
>> don't know what has changed. I've tried with pdfbox-1.4.0 and my patches to
>> 1.2.1. I'm thinking that my sample file is bad?
> Did you add the ImageIO-plugin [1] to yout classpath?
>
> BR
> Andreas Lehmkühler
>
> P.S.: Please use the mailing lists to discuss PDFBox topics.
>
> [1] http://code.google.com/p/jbig2-imageio/
>