Sets the number of pixels of padding between the watermark and the edge of the image.
The edges where the padding is applied are determined by the alignment of the watermark, which can be changed using the
markalign parameter. If the
markalign parameter is unset, the padding will be applied on the bottom right of the watermark. If the
markpad parameter is unset, the watermark will have a padding of 10 pixels.
The following example has the parameter