Compares an image to a reconstructed image

# Imagick::compareImages

(PECL imagick 2, PECL imagick 3)

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

### 说明

public function Imagick::compareImages(Imagick `$compare`, int `$metric`): array

Returns an array containing a reconstructed image and the difference between images.

### 参数

`compare`

  An image to compare to.

`metric`

  Provide a valid metric type constant. Refer to this list of metric constants.

### 返回值

Returns an array containing a reconstructed image and the difference between images.

### 错误／异常

错误时抛出 ImagickException。

### 示例

示例 #1 Using Imagick::compareImages():

Compare images and display the reconstructed image

    <?php

    $image1 = new imagick("image1.png");
    $image2 = new imagick("image2.png");

    $result = $image1->compareImages($image2, Imagick::METRIC_MEANSQUAREERROR);
    $result[0]->setImageFormat("png");

    header("Content-Type: image/png");
    echo $result[0];

    ?>

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open