Do you embed the profile when saving the tiffs?
Should I have chosen this CMYK profile?
Please ask your printer.
In general when editing photographs working in CMYK right away is not a great idea.
Hi, thanks for the response. I do embed the profile, just out of interest I tried a version without embedding and it looks different again... possibly more saturated but very dark. And again, loading the exported tiff back into photoshop restores all the colours correctly. I'm baffled.
It's not actually a photo I'm working on, it's graphics designed from scratch starting on a blank canvas, specifically grungy, deep reds in stripes.
I will double check with my printer, although I would like to think that the files I export from photoshop would match the source and original design. Otherwise I'm doomed from the start, regardless of whether or not the printer can deal with the profiles?
If Photoshop displays the image correctly the suspicion seems reasonable that your »default image viewer« is not color managed.
CMYK profile (US web coated SWOP v2). Everything looked...exactly as I wanted them. But, when I export tiffs (as my printer requested) they look very washed out and desaturated when I preview them on my computer
what do you mean?
Photoshop (and color managed apps should still be displaying correctly if you embedded an ICC profile)
of course, unmanaged (and half managed, Source> sRGB) applications will never display like Photoshop (Source> Monitor Profile) because they do not convert/transform colors to the monitor space
this phenomenon is easy to observe HERE
but the short answer to the question is
Edit> Convert to Profile: the profile your printer recommends
File> Save As your production copy (and embed the profile for good measure)
at that point Photoshop (if your monitor is correctly profiled) is the contract proof and the printer should be able to come reasonable close if he can print his own profile correctly