love.graphics.setColor
Sets the color used for drawing.

In versions prior to 11.0, color component values were within the range of 0 to 255 instead of 0 to 1.
love.graphics.setColor( red, green, blue, alpha )
red number The amount of red.
green number The amount of green.
blue number The amount of blue.
alpha (1) number The amount of alpha. The alpha value will be applied to all subsequent draw operations, even the drawing of an image.
love.graphics.setColor( rgba )
rgba table A numerical indexed table with the red, green, blue and alpha values as numbers. The alpha is optional and defaults to 1 if it is left out.