<?
   $img="telefone.jpg";
   $img=imagecreatefromjpeg($img);
   $w=imagesx($img);
   $h=imagesy($img);

      $tmp_img = imagecreatetruecolor($w, $h);
      for($x=0;$x<$w;$x++){
         for($y=0;$y<$h;$y++){

            $rnd=rand(0,100);
            $dx = cos($rnd/100*6.28)*5;
            $dy = sin($rnd/100*6.28)/5;

            $m1 = getmid($img, $x+$dx, $y+$dy);
            $m2 = getmid($img, $x-$dx, $y-$dy);

            $r = 255-abs($m1-$m2)*2;
            $g = 255-abs($m1-$m2)*2;
            $b = 255-abs($m1-$m2)*2;

            imageSetPixel($tmp_img, $x, $y, ($b << 16) + ($g << 8) + $r);
         }
      }

   header('Content-type: image/jpeg');
   imagepng($tmp_img);

   function getmid($img, $x, $y){
      $rgb = getpix($img, $x, $y);
      return ($rgb[0]+$rgb[1]+$rgb[2])/3;
   }

   function getpix($img, $x, $y){
      $rgb = imagecolorat($img, $x, $y);
      $b = ($rgb >> 16) & 0xFF;
      $g = ($rgb >> 8) & 0xFF;
      $r = $rgb & 0xFF;
      return array($r,$g,$b);
   }

?>