Instafilter\Filter::gamma PHP Method

Change the gamma of an image

public gamma ( float $gamma, integer $channel = null ) : Filter
$gamma	float	normally between 0.8 and 2
$channel	integer	Use the Imagick constants for this
return	Filter

    public function gamma($gamma, $channel = null)
    {
        $this->imagick()->gammaImage($gamma);
        return $this;
    }

Filter