[cups.development] pstopdffilter creates incomplete PDF?

[Christian Aust]

Hi all,

I'm about to create a Fax backend using CUPS on Mac OSX 10.5.2. It  
worked, until I started to add some PDF compression. Right now, two  
isues keep me from get it to work again:

(1) Order of CUPS filters
I've learned that filters can be specified using the PPD keyword  
*cupsFilter. However, is it possible to specify more than one filter,  
effectively executing both of them in a sequential order? What meaning  
has the cost parameter?

(2) Format of pstopdffilter output
When I realized that I had an issue with multiple filters in the PPD,  
I tried to add the needed functionality to my backend. There, I'd like  
to call /System/Library/Printers/Libraries/quartzfilter to apply a  
ColorSync filter to my PDF (it reduces image quality to shrink the PDF  
size)

The quartzfilter executable returns an error code 256, complaining  
about missing cross-reference tables in the PDF, and in fact  
Preview.app isn't able to open such PDF, either. It seems as if the  
outcomes of pstopdffilter are somewhat "incomplete". How can I fix that?

Any help is greatly appreciated. Best regards,

Christian Aust

p.s. One such file is available for download at http://raq550.dyndns.org/~christian/tmp-4oag3sipfax.pdf.zip 
  (60kb)