Can't do borderless printing with custom sizes in Preview
I am using Mavericks and Preview to print photos on a Canon printer than is capable of borderless printing. If I am printing standard sizes such as A5 or 4x6 which have a borderless op-tion I can print borderless no problems.
I have set up many custom sizes with zero margins and others with margins of the required size. These work in Pages to print birthday cards, but when I use them in Preview it adds a border even though I have specified none.
I have tried other software like iPhoto but it doesn't offer custom sizes or zero borders, while Canon's own Easy Photo Print will print borderless, but it cuts off the edges of the photos for some reason.
What do I have to do in Preview to make custom sizes print the whole photo borderless?
Thanks.
MacBook Pro