Problm with 2 distiller Parameters

Hi NG,

I have problems with the distiler parameters "-dColorImageFilter" and
"-dColorACSImageDict". When I enter correct values (as described in the
Adobe Distiller Parameter Manual) Ghostscript asks me to give null, true or
false as value. That does not make sense ;-)
It should give GS the Compression method and strength, which cannot be said
in Bool.

Is this just unimplented oder what could be the problem?

thanks in advance,
Philip