function Invert()
    {
        $this->r = 0xff - $this->r;
        $this->g = 0xff - $this->g;
        $this->b = 0xff - $this->b;
    }
function Invert()
    {
        $this->r = 0xff - $this->r;
        $this->g = 0xff - $this->g;
        $this->b = 0xff - $this->b;
    }
function Invert ( ) { $ this -> r = 0xff - $ this -> r ; $ this -> g = 0xff - $ this -> g ; $ this -> b = 0xff - $ this -> b ; }
Inverts the color
Inverts the color