(PECL imagick 2, PECL imagick 3)
Imagick::compareImages — Compares an image to a reconstructed image
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];?>