Converting Simple PS Transparency to PDF Fails

[Walt]

I have a PS file that contains something like this:

<< /AllowTransparency true >>
setdistillerparams
<<
   /BeginPage
   { gsave
       [ /ca .5 /SetTransparency pdfmark
       /Helvetica-Bold findfont 42 scalefont setfont
       .8 .85 .9 setrgbcolor 90 100 moveto 57 rotate
       (Some Watermark Text) show
       grestore
   } bind
>> setpagedevice


The problem is that while the transparency renders correctly
through distiller, I need to be able to distill this on a Linux
server through the commandline. ps2pdf strips out the
transparency even though it is supposed to recognize it.

Any suggestions? This is rather difficult to find information about!

Thank you,
Walt


-~