The WatermarkOptions type exposes the following members.
Auto scale the watermark. If the value is true the position and size is automatically calculated to fit the page size.
Indicates that the watermark is stamped as background. If the value is true, the watermark is laid at the bottom. By default is false and the watermark is laid on top.
Watermark left position
Watermark rotation angle
Watermark top position
Watermark transparency. Value between 0 and 1. Value 0 is fully visible, value 1 is invisible.