Watermark Tile
mark-tile
Tiles the watermark on top of the image in the requested pattern when the mark parameter is specified.
Valid value is grid. The default value is grid. Use mark-tile[N] to style a specific additional watermark layer — styles do not inherit across watermark layers.
The watermark family of parameters are used to place a single mark in a specific location. The watermark is then tiled in a grid pattern around the single mark.
Note: If mark-align is not set, the default top, left will be used for a tiled watermark. This is different from the default bottom, right for a single mark.
mark-tile=grid
Default. Tiles the watermark in a grid on top of the entire image.