Need help with php image upload

Can someone with PHP experience check these code and see why when I'm uploading a PNG image I get white image as result. Thank you for your help in advance.

/*Function For Uploading Fixed Size Image*/
function info_file_upload_imageonly($f,$dest_dir,$newname) // file upload , check formats,check
{
  //  $dest_dir = '../product_big';

  $upstat=0;
  $dest = $dest_dir . '/' . $f['name'];
  $up_err_msg='';
  $extn='';
  //echo $f['name'] . "<br>";
  $arr=explode(".",$f['name']);
  $ii=count($arr);
  //echo $ii . "<br>";
  $ii=$ii-1;
  $extn=strtolower($arr[$ii]);
  //$extn=strtolower($extn1);
  $newname=$dest_dir . "/" . $newname . "." . $extn;
  //echo $newname . "<br>";
  if ($extn!='jpg' && $extn!='png' && $extn!='jpeg' && $extn!='gif')
  { //echo $extn;
  $up_err_msg="Invalid File Format.";
  // echo $up_err_msg . $extn;
  }
  else{  // upload file
  if (!is_uploaded_file ($f['tmp_name']))
  {
  $up_err_msg="Error: No file uploaded";

  }
  else if (!file_exists ($dest_dir))
  {
  $up_err_msg="Error: Destination directory " . $dest_dir . "does not exist!";
  $upstat=1;
  }
  else if (!is_dir ($dest_dir))
  {
  $up_err_msg="Error: Destination directory " . $dest_dir . " is not a directory!";
  $upstat=1;
  }
  else if (file_exists ($newname)) // previously file_exists path was $dest
  {
  $up_err_msg="File already exist. Please rename the file and upload it again.";
  $upstat=1;
  }

// all clear, move the file to its permanent location
  if ($upstat!=1)
  {
  $r = move_uploaded_file ($f['tmp_name'], $dest);
  if ($r == false)
  {
  $up_err_msg="Error: Could not copy file to " . $dest;
  exit;
  }
  else
  {
  $up_err_msg="";
  chmod ($dest,0755);
  @rename($dest,$newname);
  }
  }
  } //end upload file

  $up_err_msg1[0]["msg"]=$up_err_msg;
  $up_err_msg1[0]["extn"]=$extn;
  return $up_err_msg1;
}






/* Image Uploading and Resizing function */
function info_img_upload_resize_gen1($f,$newname,$path,$thumb_size,$big_size,$big_size_width=0) //
{
  //upload section
  $dest_dir = substr($path,0,strlen($path)-1);
  $upstat=0;
  $dest = $path . $f['name'];
  $up_err_msg='';
  $extn='';
  //echo $f['name'] . "<br>";
  $arr=explode(".",$f['name']);
  $ii=count($arr);
  //echo $ii . "<br>";
  $ii=$ii-1;
  $extn=strtolower($arr[$ii]);
  //$extn=strtolower($extn1);
  //$new_name=$newname;
  $imgname= $newname . "." . $extn;
  $newname=$path . $newname . "." . $extn;
  //print_r($arr);
  //echo $newname; die();
  //$newname1="../parks_pic/thumb/" . $new_name . "." . $extn;
  //echo $newname . "<br>";
  //if ($extn!='jpg' && $extn!='jpeg' && $extn!='gif' && $extn!='png')
  if ($extn!='jpg' && $extn!='jpeg' && $extn!='gif' && $extn!='png')
  {
  $up_err_msg="Invalid File Format.";
  }
  else
  {  // upload file

  if (!is_uploaded_file ($f['tmp_name']))
  {
  $up_err_msg="Error: No file uploaded";
  }
  else if (!file_exists ($dest_dir))
  {
  $up_err_msg="Error: Destination directory " . $dest_dir . "does not exist!";
  $upstat=1;
  }
  else if (!is_dir ($dest_dir))
  {
  $up_err_msg="Error: Destination directory " . $dest_dir . " is not a directory!";
  $upstat=1;
  }
  else if (file_exists ($dest))
  {
  $up_err_msg="File already exist. Please rename the file and upload it again.";
  $upstat=1;
  }

  // all clear, move the file to its permanent location
  if ($upstat!=1)
  {
  $r = move_uploaded_file($f['tmp_name'], $dest);
  if ($r == false)
  {
  $up_err_msg="Error: Could not copy file to " . $dest;
  exit;
  }
  else
  {
  $up_err_msg="";
  chmod ($dest,0755);
  $dest1=$dest;

  //
  //if (file_exists ($dest))
  //  unlink($newname);
  //

  rename($dest,$newname);

  //rename($dest1,$newname1);
  }
  }
  } //end upload file

  $up_err_msg1[0]["msg"]=$up_err_msg;
  $up_err_msg1[0]["extn"]=$extn;
  if($up_err_msg1[0]["msg"]!="")
  {
  return $up_err_msg1;
  }

  $filename1 = $newname;

  list($width, $height) = getimagesize($filename1);
  $res_img= $path . $filename1;
  if ($width>$thumb_size || $height>$thumb_size)
  {


//$extnarr=explode(".",$filename);
//$extn=$extnarr[1];


  if($big_size==0)
  {
  $th_filename1 = $path . $imgname;

  }
  else
  {
  $th_filename1 = $path ."thumb/". $imgname;
  $big_filename1 = $path . $imgname;
  }
  $filename=$filename1;
  $percent = 0.2;

  // Content type
  if ($extn=='jpg' || $extn=='jpeg')
  header('Content-type: image/jpeg');
  else if ($extn=='gif')
  header('Content-type: image/gif');
  else if ($extn=='png')
  header('Content-type: image/png');
  //end content type
  // Get new dimensions
  list($width, $height) = getimagesize($filename);
  $ratio=$width/$height;
  if ($width>$height)
  {
  $new_width=$thumb_size;
  $new_height=(int)($thumb_size/$ratio);
  }
  else
  {
  $new_height=$thumb_size;
  $new_width=(int)($thumb_size*$ratio);
  }

  if($big_size!=0)
  {
  if ($width>$height)
  {
  $new_big_width=$big_size;
  $new_big_height=(int)($big_size/$ratio);
  }
  else
  {
  $new_big_height=$big_size;
  $new_big_width=(int)($big_size*$ratio);
  }
       
      if($big_size_width>0) {
  $new_big_width=(int)$big_size_width;
      }

  }

  // echo "Featutred : " . $featured . " width=" . $new_width . " height: " . $new_height;
  //$new_width = $width * $percent;
  //$new_height = $height * $percent;
  // end dimension
  // Resample

  $image_p = imagecreatetruecolor($new_width, $new_height);
  if ($extn=='jpg' || $extn=='jpeg')
  {
  $image = imagecreatefromjpeg($filename);
  imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
  // Output
  imagejpeg($image_p,$th_filename1, 100);
  }
  else if ($extn=='gif')
  {
  $image = imagecreatefromgif($filename);
  imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
  // Output
  imagegif($image_p,$th_filename1, 100);
  }
  else if ($extn=='png')
  {
  $image = imagecreatefrompng($filename);
  //imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
  // Output
  imagepng($image_p,$th_filename1, 100);
  }

  //die();
  if($big_size!=0)
  {
  list($width, $height) = getimagesize($filename1);
  //$res_img= $path . $filename1;
  if ($width>$big_size || $height>$big_size)
  {
  $image_p = imagecreatetruecolor($new_big_width, $new_big_height);
  $new_width = $new_big_width;
  $new_height = $new_big_height;
  if ($extn=='jpg' || $extn=='jpeg')
  {
  $image = imagecreatefromjpeg($filename);
  imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
  // Output
  imagejpeg($image_p,$big_filename1, 100);
  }
  else if ($extn=='gif')
  {
  $image = imagecreatefromgif($filename);
  imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
  // Output
  imagegif($image_p,$big_filename1, 100);
  }
  else if ($extn=='png')
  {
  $image = imagecreatefrompng($filename);
  //imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
  // Output
  imagepng($image_p,$big_filename1, 100);
  }
  }
  }
  }
  else
  {
  copy($filename1,$path.$imgname);
  }

Code (markup):

 

I could be completely off on this, but looking quickly over your code, it seems that you have a difference between the .png extensions and all the other extensions. If all the other extensions are working properly and PNG is the only one that is off, I would start with this and see if this works:

// imagecopyresampled(......

PHP:

Seems you have // in there for the png both times "imagecopyresampled" is called towards the bottom of your script. This will cause that line of code to not "fire" or run. I would try to remove the // from them and run the script again to see if that fixes it. Again, I could be totally off, but that's what I found from just a quick scan of the code.

 

I tried