Problem with full page graphic in Open Writer

Hallo everybody,

i try to create a pdf from an Open Office Document odt

the first page is a A5 format with a full page graphic and with

pdf creator there is always a thin withe line at the bottom

and at the right edge,

it is like that the picture would not be really full page but smaller,

and in open office the size of the picture is exactely full page,

how to have a full page graphic on the pdf?

thank you very much