I trust this is the best section to ask this in and I wonder if anyone can help me.
I want to have books published (POD) with Bob Books in the UK using their Layflat option. In this case they take the digital images and do the actual processing using traditional silver halide/C-Type/chromogenic methods, with photo sensitive paper and chemicals. I thought they wanted sRGB files as POD services usually do and so converted to sRGB (I found later they seem to be saying my original ProPhoto RGB file would have worked fine too but my question would also apply there as well.) I have used Blurb a few times before and soft proofed the sRGB files they required in PS, with generally good results, but they were using the ink and CYMK printing method and not silver halide.
So my question is, do I need to soft proof the images using the sRGB preview/simulation as usual, at least for those images where the preview is showing a big difference from the ProPhoto originals, or will this mess things up? I can't get my head around the idea of soft proofing for a chemical print, it doesn't sound right, but at the same time I can't see how sending a ProPhoto file would turn out exactly the same as an sRGB file.
I can't get through to their technicians directly and have been waiting 8 days for an answer to my question which I need urgently. Can anyone help?
Thanks.