love.graphics:setBackgroundColor( red, green, blue )
No alpha value is present as the background cannot be transparent.
Usage
love.graphics:setBackgroundColor( red, green, blue )Arguments
redThe amount of red.
greenThe amount of green.
blueThe amount of blue.
Returns
Nothing
Examples
Example 1:  Set the current color as red, then blue. 
love.graphics:setBackground(255, 10, 10);
love.graphics:setBackground(10, 10, 255);