PDF File Alteration

[Adam Tauno Williams <adam@xxxxxxxxxxxxxxxx>]

I have some PDF files of what apparently were PowerPoint (a registered trademark
of the Microsoft corporation) presentations.  I can convert each of these pages
to a PBM with "pdftopbm" (output OK, but not great),  and I can also open them
in GIMP (something I discovered by accidently openning the PDF instead of the
PBM, and they look great).  What I need to do is plaster several PDF files,
images, text documents, etc... into one file that users can request be printed
on a B/W laser via a web form, whatever... (probably will turn it all back into
a PDF or Postscript file).  My dillema is that these PDFs look great on the
screen but print terrible as they are white letters on a pale blue graphic
background.  I'm wondering if anyone knows of a way (command?) to remove the
background from a PDF?  I don't even know if PDFs store the background seperate
from the text, etc.... so maybe I'm grasping at straws.  If so, just whack me.

Systems and Network Administrator
Morrison Industries
1825 Monroe Ave NW.
Grand Rapids, MI. 49505