Thanks for your responses. I've so far changed the colour space on my x100 twice since this thread started! The consensus seems to be sRGB for jpgs. The defaults seem to work well for all other settings so I'll trust fuji on this one. To be honest there are things that worry me more about this camera than the colour space at this point, namely the focal distance in auto-focus, the RAW button reverting to jpg after each exposure, the battery life and other 'quirks' as they're politely known but I'll save all that for another post.