(PECL imagick 2.0.0)
Imagick::compareImageLayers — Returns the maximum bounding region between images
Compares each image with the next in a sequence and returns the maximum bounding region of any pixel differences it discovers. �˷�����Imagick����ImageMagick 6.2.9���ϰ汾����ʱ���á�
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Example #1 Using Imagick::compareImageLayers()
Comparing image layers
<?php
/* create new imagick object */
$im = new Imagick("test.gif");
/* optimize the image layers */
$result = $im->compareImageLayers(imagick::LAYERMETHOD_COALESCE);
/* work on the $result */
?>