Running setwp <wallpaper> will set <wallpaper> to fill the screen. For more options, see help :
Usage:
setwp [--fit | --stretch | --center | --tile] <wallpaper>
setwp --help | --version
Options:
-f --fit Fit wallpaper to screen.
-s --stretch Stretch wallpaper to fill screen.
-c --center Center wallpaper.
-t --tile Tile wallpaper.
-h --help Show this help message.
-v --version Show version information.
Todo
Option to set picture position (fill, fit, strech, center, tile)