[NTG-context] Low res output possible?

Just wondering: in programs like InDesign, Viva Designer, it is trivial to produce a low resolution pdf output (useful when exchanging a hi-res file with authors and editors prior to pre-print is difficult). I assume it might be possible to do so in ConTeXt. Currently I use a script (gs) to achieve that once I have the ConTeXt output so it is no difficulty, but if that could be done at time of compiling it would make the process just that bit simpler. Possible? Julian