(PECL imagick 2, PECL imagick 3)
Imagick::compareImages — Compares an image to a reconstructed image
public Imagick::compareImages ( Imagick $compare , int $metric ) : array
Returns an array containing a reconstructed image and the difference between images.
compare
An image to compare to.
metric
Provide a valid metric type constant. Refer to this list of metric constants.
Returns an array containing a reconstructed image and the difference between images.
Throws ImagickException on error.
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];
?>
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https://www.php.net/manual/en/imagick.compareimages.php