Thank you again, I will try this later, when I have time again 
to work on this. I will let you know about the results.

Andreas


On 20 Jul 2003 at 13:32, Leonard Rosenthol wrote:

> At 7:52 PM +0200 7/19/03, Andreas Probst wrote:
> >Thank you both Matt and Leonard for your replies. Unfortunately
> >they don't really make me hope to find a solution. :-(
> 
>  The only solution involves a LOT of internal knowledge about PDF
> and a LOT of time to develop such a tool.   My company did some
> work for a client related to PDF comparing - it took us a good
> 3-4 months to develop a solution that worked reliably and we were
> starting with all the necessary PDF processing tools and know
> how...
> 
> 
> >Matt, I've already tried the approach with Ghostscript. I
> >converted the PDF into Postscript and PCL.
> 
>  Wrong idea.
> 
>  I think Matt's idea was to just create a raster image JPEG,
> TIFF, PNG) and then compare the raster output.  That will
> certainly tell you some things - but again, it's far from
> perfect.
> 
> 
> >I'd need to confirm that the print output is the same as before:
> >i.e. text and structure.
> 
>  The only CORRECT way to do that is to do extremely low level PDF
> analysis...
> 
> 
> 
> Leonard
> -- 
> -----------------------------------------------------------------
> ---------- Leonard Rosenthol                           
> <mailto:[EMAIL PROTECTED]> Chief Technical Officer           
>           <http://www.pdfsages.com> PDF Sages, Inc.              
>                215-629-3700 (voice)
>                                 215-629-0789 (fax)
> 




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