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/
