Problemer med GDlib og resizing.

Hej. Jeg har dette script som resizer mine billeder, men billeder bliver grynet når jeg kører den. :]

createpic("../picture/".$_FILES[PictureFile][name],200,"../picture/".$filnavn[0]."_200px_width.jpg");

function createpic($image_source,$sizex,$output_file){
  $image_source = "../picture/".$image_source;
  $output_file = "../picture/".$output_file;
  $backup_file = $output_file . "_backup.jpg";
  copy($image_source,$backup_file);
  $image_properties = getimagesize($backup_file);

  if ($image_properties[0]<$sizex) {return(0);}
  $ratio = $image_properties[1]/$image_properties[0];
  $thumb_y = ($sizex*$ratio);

  if (!$image_properties[2] == 2) {
    return(0);
  } else {
    $src_image = imagecreatefromjpeg($backup_file);
    $src_x = imagesx($src_image);
    $src_y = imagesy($src_image);
    if (($thumb_y == "0") && ($sizex == "0")) {
      return(0);
    } elseif ($thumb_y == "0") {
      $scalex = $sizex/($src_x-1);
      $thumb_y = $src_y*$scalex;
    } elseif ($sizex == "0") {
      $scaley = $thumb_y/($src_y-1);
      $sizex = $src_x*$scaley;
    }
    $sizex = (int)($sizex);
    $thumb_y = (int)($thumb_y);
    $dest_image = imagecreatetruecolor($sizex, $thumb_y);
    imagefill($dest_image,1,1,imagecolorallocate($dest_image, 255, 255, 255));
    unlink($backup_file);
    if (!imagecopyresized($dest_image, $src_image, 0, 0, 0, 0, $sizex, $thumb_y, $src_x, $src_y)) {
      imagedestroy($src_image);
      imagedestroy($dest_image);
      return(0);
    } else {
      imagedestroy($src_image);
      if (imagejpeg($dest_image,$output_file)) {
        imagedestroy($dest_image);
        return(1);
      }
      imagedestroy($dest_image);
    }
    return(0);
  }
}