/**
  * Merge two Images together
  */
 public function merge(GDBackend $image)
 {
     imagealphablending($this->owner->getImageResource(), false);
     imagesavealpha($this->owner->getImageResource(), true);
     imagealphablending($image->getImageResource(), false);
     imagesavealpha($image->getImageResource(), true);
     $srcX = 0;
     $srcY = 0;
     $srcW = $image->getWidth();
     $srcH = $image->getHeight();
     $dstX = round(($this->owner->getWidth() - $srcW) / 2);
     $dstY = round(($this->owner->getHeight() - $srcH) / 2);
     $dstW = $image->getWidth();
     $dstH = $image->getHeight();
     imagecopyresampled($this->owner->getImageResource(), $image->getImageResource(), $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH);
     $output = clone $this->owner;
     $output->setImageResource($this->owner->getImageResource());
     return $output;
 }