Exactly, it expects you to provide the image. The coordinates are currently expected to be absolute and pixel-specific, where 55,11 is 55 pixels inward and 11

Exactly, it expects you to provide the image. The coordinates are currently expected to be absolute and pixel-specific, where 55,11 is 55 pixels inward and 11 downward. If there was sufficient interest, I could implement relative positioning as well, where they resolve to a percentage of the source image.