Printing black and white versions of prosper slideshows, two-per-page

Instead of starting with something like:

    \documentclass[pdf,serpaggi,slideColor,colorBG]{prosper}

say

    \documentclass[ps,serpaggi,slideBW,nocolorBG,accumulate]{prosper}

Produce a file.ps as usual. Then, say:

   $ pstops -pa4 '2:0L@.7(21cm,0)+1L@.7(21cm,14.85cm)' file.ps new.ps
   $ ps2pdf new.ps

and you have a new.pdf that's ready to send off to anyone.

Ajay Shah, 2002