-c,--color <[#]rrggbb>
Set the background color.
-h,--help
Show help message and quit.
-i,--image <path>
Set the background image.
-m,--mode <mode>
Scaling mode for images: stretch, fill, fit, center, or tile. Use the additional mode solid_color to
display only the background color, even if a background image is specified.
-o,--output <name>
Select an output to configure. Subsequent appearance options will only apply to this output. The
special value * selects all outputs.
-v,--version
Show the version number and quit.