Lets you control the brightness, saturation, and hue of an image. Hue is the percentage of absolute rotation from the current position. For example 50 results in a counter-clockwise rotation of 90 degrees, 150 results in a clockwise rotation of 90 degrees, with 0 and 200 both resulting in a rotation of 180 degrees.
function modulateImage($image_path, $hue, $brightness, $saturation)
{
    $imagick = new \Imagick(realpath($image_path));
    $imagick->modulateImage($brightness, $saturation, $hue);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}