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
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