> I am producing a magazine and understand that the PDF/X-3 format is the best > one for commercial printers which I will be using.
Only if you have colour management set up properly. And the reason you can not select X-3 is probably that you don't. If the printer does not specifically require X-3 I'd go for 1.5. (Some printers might even not be able to handle a X-3 PDF.) /Peter
