Compares an image to a reconstructed image

# Imagick::getImageDistortion

(PECL imagick 2, PECL imagick 3)

Imagick::getImageDistortion — Compares an image to a reconstructed image

### 说明

public function Imagick::getImageDistortion(MagickWand `$reference`, int `$metric`): float

Compares an image to a reconstructed image and returns the specified distortion metric.

### 参数

`reference`

  Imagick object to compare to.

`metric`

  One of the metric type constants.

### 返回值

Returns the distortion metric used on the image (or the best guess thereof).

### 错误／异常

错误时抛出 ImagickException。

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