This is something you need to do in an image editor, like Photoshop, before creating the PDF. Acrobat only identifies "white margins" as areas where no objects (images, text, graphics, etc.) exist at all.
This is something you need to do in an image editor, like Photoshop, before creating the PDF. Acrobat only identifies "white margins" as areas where no objects (images, text, graphics, etc.) exist at all.