The watermark position
The watermark can be postioned vertically and horizontally in three ways. In addition to
this an offset can be specified which is a whole number of pixels. If the
watermark is next to the edge of the image then the offset is used to move the image
away from that edge. If the vertical and horizontal position is both center then
the offset will move the watermark down towards the bottom of the image.
Rotating the watermark
If the vertical position is the center and the horizontal position is either
left or right that H2Omarker will rotate the watermark 90 degrees. The offset
value then becomes the number of pixels between the watermark and the main image's
edge.