PHP script using the Imagick module

/**
 * 
 */
function createPreview($_file, $_noise_image) {
	// create handle for new PDF document
	$pdf_handler = pdf_new();
	// open a file
	pdf_open_file($pdf_handler, dirname($_file) . "/" . "preview_" .  basename($_file));
	// insert the previews
	$images = new Imagick($_file);
	//
	foreach ($images as $k => $image) {
		
		/****************************************
		 * THE NOISE
		 ***************************************/
		 
		// Get original size of image
		$height = $image->getImageHeight();
		$width = $image->getImageWidth();
		
		// We need an overlay ~66% of the image
		$o_height = floor(2*($height) / 3);
		 
		// Grab region of the image and make into a new Imagick class
		$im_overlay = $image->getImageRegion($width, $o_height, 0, $height - $o_height);
		 
		// Do obfuscating effect.
		$im_overlay->blurImage(5,6);
		//$im_overlay->addNoiseImage(imagick::NOISE_LAPLACIAN);
		 
		// Overlay images
		$image->compositeImage($im_overlay, imagick::COMPOSITE_OVER, 0, $height - $o_height);
		
		// Comment : I almost forgot the text overlay. Just add this after:
		// image->compositeImage($im_overlay, imagick::COMPOSITE_OVER, 0, $height - $o_height);
		
		/****************************************
		 * THE PREVIEW TEXT
		 *************************************/
		
		 // Do preview text
		$draw = new ImagickDraw();		 
		// Set font soze
		$draw->setFontSize(52);		 
		// Align text to center
		$draw->setTextAlignment(imagick::ALIGN_CENTER);		 
		// Initialize color class
		$black = new ImagickPixel();
		$black->setColor('black');		 
		// Set text color
		$draw->setFillColor($black);		 
		// Draw text in middle of image (within 66%)
		$draw->annotation(floor($width / 2), floor($height / 2), 'PREVIEW');		 
		// Overlay text
		$image->drawImage($draw);
		
		
		/******************************
		 * CREATE THE IMAGE
		 ****************************/
 
		// Write out image, go on.
		$preview_jpeg =  dirname($_file) . "/" . "tmp_page" . $k . '_.jpg';			
		$image->setImageFormat("jpg");	
		$image->writeImage($preview_jpeg);	
		
		// start a new page (A4)
		pdf_begin_page($pdf_handler, 595, 842);
		$pdfimage = pdf_load_image($pdf_handler, "jpeg", $preview_jpeg, "");	
		pdf_place_image($pdf_handler, $pdfimage, 0, 0, 1);
		
		// end page (A4)
		pdf_end_page($pdf_handler);		
		// clean
		@unlink($preview_jpeg);
		//$image->clear();
		//$image->destroy();
	}
	// close and save file
	pdf_close($pdf_handler);
}