If you want your image printed to the edge of the page, we will need the image to 'bleed' off the edge of the sheet to allow for trimming.
For example to create a 3mm bleed on A4 the page size will be 216mm x 303mm, this allows for 3mm trimming all around the page.
It is also important that any text and graphics are kept a minimum of 4mm from the edge of the sheet.