(PECL imagick 2, PECL imagick 3)
Imagick::getImageDistortion — Compares an image to a reconstructed image
$reference, int $metric): floatCompares an image to a reconstructed image and returns the specified distortion metric.
Returns the distortion metric used on the image (or the best guess thereof).
錯誤時(shí)拋出 ImagickException。