I was at the local gallery recently and they put an entirely new section up to celebrate the Simpson desert. The pictures looked fantastic and I noticed they specified FujiFilm Velvia as the film used. I'm wondering how they ended up with the giant poster sized prints. I know the best positive process and indeed the best quality from the 35mm format I've seen so far was done via the Ilfochrome process, and I have found a lab in Brisbane which can do this. But as far as I've figured out this is a positive only process. So what's the best printing method for poster sized prints from 35mm negatives?