Use point 3 to get the image bytes and feed them to TIFFFaxDecoder. You may
have to get the dictionary parameters from the PRStream.
----- Original Message -----
From: "John Pruitt" <[EMAIL PROTECTED]>
To: "Paulo Soares" <[EMAIL PROTECTED]>
Cc: <itext-questions@lists.sourceforge.net>
Sent: Wednesday, November 23, 2005 8:03 PM
Subject: Re: [iText-questions] CCITTFax Decode
I am trying to follow your recommendations, however I am having a few
problems. I have been trying to use TiffImage.getTiffImage() to extract the
tiff images from my pdf.
1. First, I tried to use PdfReader.getSafeFile() after opening my pdf with
the PdfReader and passed the RandomAccessFileOrArray to
TiffImage.getTiffImage(). For some reason, the RandomAccessFileOrArray
returned from PdfReader.getSafeFile() contains a null RandomAccessFile
reference. This null pointer causes an exception in
TiffImage.getTiffImage(). Is getSafeFile() broken, or am I doing something
wrong?
2. Next, I created a RandomAccessFileOrArray directly using my pdf's
filename and the constructor. Then, I tried to get the first tiff from the
pdf using TiffImage.getTiffImage(), but I get an exception "Bad endianness
tag..."
3. Next, I used PdfReader.getPageN() to get the dictionary for a page and
used it to eventually get a PRStream to the image. Then I tried creating a
RandomAccessFileOrArray using the PRStream.getBytes() and also with
PdfReader.getStreamBytes(PRStream). Then, I pass this fileorarray to
TiffImage.getTiffImage() and I again get a "Bad endianness tag..."
exception.
There must be something I am missing. Would you might providing a little
more insight? I really appreciate your time and help.
Thank you,
John
Paulo Soares wrote:
If you want a CCITTFax decoder look at
com.lowagie.text.pdf.codec.TIFFFaxDecoder.java. Look at TiffImage.java
for info on how to use it. You can extract streams with
PdfReader.getStreamBytes().
----- Original Message ----- From: "John Pruitt" <[EMAIL PROTECTED]>
To: "Paulo Soares" <[EMAIL PROTECTED]>
Cc: <itext-questions@lists.sourceforge.net>
Sent: Tuesday, November 22, 2005 7:25 PM
Subject: Re: [iText-questions] CCITTFax Decode
I believe the following (taken from CCITTFaxDecodeFilter.java of pdfbox)
might explain why pdfbox does not decode my pdfstream and produce the
images I need:
public void decode( InputStream compressedData, OutputStream result,
COSDictionary options ) throws IOException
{
org.pdfbox.util.ErrorLogger.log( "Warning: CCITTFaxDecode.decode
is not implemented yet, skipping this stream." );
}
The decoder has not been implemented. I have been searching for 2 weeks
now for a decoder.
John
Paulo Soares wrote:
Use pdfbox to extract the images.
----- Original Message ----- From: "John Pruitt" <[EMAIL PROTECTED]>
To: <itext-questions@lists.sourceforge.net>
Sent: Tuesday, November 22, 2005 6:20 PM
Subject: [iText-questions] CCITTFax Decode
My company has been using iText successfully to convert multi-page
tiff files into encrypted pdf files for some time now. I am working on
a project in which I need to convert these pdf files back to
multi-page tiffs. I am aware that iText is primarily designed for
creating pdfs as opposed to extracting content from pdfs, however this
is a simple, specific case in which each page consists of a single,
full-page image. I was wondering if there might be an easy way to
extract these images with iText? I am looking through the
com.lowagie.text.pdf.codec classes, but have yet to understand how I
might be able to use them. I have also looked into another Java pdf
library called "pjx." With pjx I am able to get the PdfStream data for
the images out, however I am having trouble finding a CCITTFax decoder
to decode the stream. Ideally, I would like to get the images in a
java.awt.* format.
If anyone could provide any insight, leads, links, sample code, etc,
it would be greatly appreciated.
Thank you very much,
John
-------------------------------------------------------
This SF.Net email is sponsored by the JBoss Inc. Get Certified Today
Register for a JBoss Training Course. Free Certification Exam
for All Training Attendees Through End of 2005. For more info visit:
http://ads.osdn.com/?ad_id=7628&alloc_id=16845&op=click
_______________________________________________
iText-questions mailing list
iText-questions@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/itext-questions
-------------------------------------------------------
This SF.Net email is sponsored by the JBoss Inc. Get Certified Today
Register for a JBoss Training Course. Free Certification Exam
for All Training Attendees Through End of 2005. For more info visit:
http://ads.osdn.com/?ad_id=7628&alloc_id=16845&op=click
_______________________________________________
iText-questions mailing list
iText-questions@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/itext-questions
-------------------------------------------------------
This SF.Net email is sponsored by the JBoss Inc. Get Certified Today
Register for a JBoss Training Course. Free Certification Exam
for All Training Attendees Through End of 2005. For more info visit:
http://ads.osdn.com/?ad_id=7628&alloc_id=16845&op=click
_______________________________________________
iText-questions mailing list
iText-questions@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/itext-questions
-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems? Stop! Download the new AJAX search engine that makes
searching your log files as easy as surfing the web. DOWNLOAD SPLUNK!
http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click
_______________________________________________
iText-questions mailing list
iText-questions@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/itext-questions
