I think this has nothing to do with Ghostscript.NET ( wrapper ) and it's more native Ghostscript question. If that's a case, I would suggest you to ask this question on the Ghostscript IRC channel. (http://ghostscript.com/irclogs/current.html) (server: irc.freenode.net , room: #ghostscript )
Cheers,
Josip
Cheers,
Josip