GD kütüphanesi watermark sorunu

if ($thumb2 == 1){
// create second thumbnail image - resize original to 125 width x 125 height pixels 
$newheight = ($height/$width)*471;
$newwidth = 700;
$tmp=imagecreatetruecolor($newwidth,$newheight);
imagealphablending($tmp, false);
imagesavealpha($tmp,true);
$transparent = imagecolorallocatealpha($tmp, 255, 255, 255, 127);
imagefilledrectangle($tmp, 0, 0, $newwidth, $newheight, $transparent);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);

// write thumbnail to disk
$write_thumb2image = $folder .'/buyuk-'. $image;
 switch($ext){
  case "gif":
	imagegif($tmp,$write_thumb2image);
  break;
  case "jpg":
	imagejpeg($tmp,$write_thumb2image,100);
  break;
  case "jpeg":
	imagejpeg($tmp,$write_thumb2image,100);
  break;
  case "png":
	imagepng($tmp,$write_thumb2image);
  break;
 }
}