I've realised that I am unable to create an artboard using CMYK colour so looks like this isn't an option i'll be able to use. Thanks so much for all your help! ... View more

I've tried that, thanks.  It saves as a photoshop pdf and my partner who doesn't have photoshop cant open the file. ... View more

I'm trying to convert a billboard advert to pdf so that I can upload it to the printers website for printing and this is the only format they accept.  Ive tried saving it as a jpg and then opening preview and converting to pdf but i'm getting a white border around the image. ... View more