I spoke to a print shop in Manchester this morning, since they advertise large canvas prints (150cm x 60cm maximum, which is pretty big for me). I thought I'd about profiles for soft-proofing.
They told me that they don't use a printer profile: they print from Photoshop to their iPF8300 using "printer manages colours". They wouldn't tell me what canvas they use, other than that it's a polyester / cotton mix that's not a branded make, so I can't try to find a profile from the manufacturer's web site (not that it would be much use, given the first point).
They're not dramatically cheap (£125 for the maximum size, above, gallery-wrapped).
I was rather surprised and was left with the feeling that they would best be avoided. Am I being unfair?
Jeremy