GD + Imagick = morphing

gistfile1.php

<?php
/**
 * GD+Imagick = morphing
 * 
 * @param string  $fromPath
 * @param string  $toPath
 * @param string  $outPath
 * @param integer $frame OPTIONAL
 * @param integer $delay OPTIONAL
 */
function morph($fromPath, $toPath, $outPath, $frame=10, $delay=1) {
  $im = new Imagick();

  $gf = imagecreatefromjpeg($fromPath);  
  $gt = imagecreatefromjpeg($toPath);
  $sz = getimagesize($toPath);
  
  $wkImg = '__work__.jpg';
  
  for($i=1; $i<=$frame; $i++) {
    
    imagecopymerge($gf, $gt, 0,0, 0,0, $sz[0],$sz[1], (100/$frame)*$i);
    imagejpeg($gf, $wkImg);
    
    $tmp = new Imagick($wkImg);
    $tmp->setFormat('gif');
    $tmp->setImageDelay($delay*100);
    $im->addImage($tmp);
    
    $tmp->destroy();
    unlink($wkImg);
  }
  
  $im->writeImages($outPath, true);
  $im->destroy();
  imagedestroy($gf);
  imagedestroy($gt);
}

// ex
morph('a.jpg', 'b.jpg', 'out.gif', 10, 0.1);