public function apply_filter()
{
$this->hsl(0, -100, 0)->curves_graph('-0.062*u^3-0.104*u^2+1.601*u-0.175')->brightness_contrast(-10, 48);
// it would be nice to do the curves like this!
/*$this->curves(array(
array(11,0),
array(69,86),
array(158,185),
array(255,220),
));*/
}