Imagick
PHP Manual

Imagick::compareImages

Compares an image to a reconstructed image

Description

array Imagick::compareImages ( Imagick $compare , int $metric )

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

Parameters

compare

An image to compare to.

metric

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

Return Values

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

Errors/Exceptions

Throws ImagickException on error.

Examples

Example #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];

?>