hi > If the end result is to be a poster then CMYK would be my choice. It is > printing after all.
he is probably printing the poster on a internal print shop with a laser printer which expects RGB files... afaik, nowadays, printing not always expects CMYK, anymore! and you should only do CMYK if somebody requested to do so (or you have the knowhow to handle CMYK!) ciao a.l.e
