rgba
Creates a new Color instance from the passed RGBA values.
Return
a new Color instance
Parameters
red
the red channel value in the 0..1 range
green
the green channel value in the 0..1 range
blue
the blue channel value in the 0..1 range
alpha
the opacity channel value in the 0..1 range
Throws
if any of the passed values is out of the 0..1 range