Re: Does anyone know....
depends on the quality of the original
To go past A3 you need about 10Megapixels as a general guide. even then pixels isn't a infalible guide, a 6M from a DSLR will generally be a lot better blown up than a £99 10meg pixel compact. this is due to lens, sensor and processing circuits of teh image.
There are loads of online people who do this sort of thing but if you want a walk in service try garth(although I can't recall him doing it) or the big chains like max spielman , Jessops, etc
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