Looking for transparency help

I have a script I kind of tweaked which would resize my images, jpg, gif, or pngs. The script uploads a copy of the source and then a resized thumbnail.

Only issue is that the thumbnail of a png has a black background and I cant figure out how to keep the original transparency.

Originally Posted by Jako I have a script I kind of tweaked which would resize my images, jpg, gif, or pngs. The script uploads a copy of the source and then a resized thumbnail. Only issue is that the thumbnail of a png has a black background and I cant figure out how to keep the original transparency. PHP Code: <?php   ########################################   # include the getNextFilename function #   ########################################   include('getNextFilename5.php'); // use getNextFilename4.php on a PHP 4 server   ########################################      // define constants   define('THUMBS_DIR', '/home/golden/public_html/images/clubs/thumbs/');   define('MAX_WIDTH', 120);   define('MAX_HEIGHT', 90);      // process the uploaded image   if (is_uploaded_file($_FILES['image']['tmp_name'])) {     $original = $_FILES['image']['tmp_name'];     // begin by getting the details of the original     list($width, $height, $type) = getimagesize($original);     // calculate the scaling ratio     if ($width <= MAX_WIDTH && $height <= MAX_HEIGHT) {       $ratio = 1;       }     elseif ($width > $height) {       $ratio = MAX_WIDTH/$width;       }     else {       $ratio = MAX_HEIGHT/$height;       }     // strip the extension off the image filename     $imagetypes = array('/\.gif$/', '/\.jpg$/', '/\.jpeg$/', '/\.png$/');     $name = preg_replace($imagetypes, '', basename($_FILES['image']['name']));     ########################################################     # getNextFilename() requires the file type as a string #     # so begin by converting it to a string assigned to $t #     ########################################################     switch($type) {       case 1:         $t = 'gif';         break;       case 2:         $t = 'jpg';         break;       case 3:         $t = 'png';       }     ################################     # get new name for upload file #     ################################     $newName = getNextFilename5(UPLOAD_DIR, $name, $t);  // use getNextFilename4() on a PHP 4 server     ################################################     # use the new name instead of the existing one #     ################################################     // move the temporary file to the upload folder     $moved = move_uploaded_file($original, UPLOAD_DIR.$newName);     if ($moved) {       $result = "$newName successfully uploaded; ";       $original = UPLOAD_DIR.$newName;       }     else {       $result = 'Problem uploading '.$_FILES['image']['name'].'; ';       }     ################################################     // create an image resource for the original     switch($type) {       case 1:         $source = @ imagecreatefromgif($original);         if (!$source) {           $result = 'Cannot process GIF files. Please use JPEG or PNG.';           }         break;       case 2:         $source = imagecreatefromjpeg($original);         break;       case 3:         $source = imagecreatefrompng($original);         break;       default:         $source = NULL;         $result = 'Cannot identify file type.';       }     // make sure the image resource is OK     if (!$source) {       $result = 'Problem copying original';       }     else {       // calculate the dimensions of the thumbnail       $thumb_width = round($width * $ratio);       $thumb_height = round($height * $ratio);       // create an image resource for the thumbnail       $thumb = imagecreatetruecolor($thumb_width, $thumb_height);       // create the resized copy       imagecopyresampled($thumb, $source, 0, 0, 0, 0, $thumb_width, $thumb_height, $width, $height);       // save the resized copy       switch($type) {         case 1:           ######################################################           # use the new name as the basis for the thumb's name #           ######################################################           $name = basename($newName, '.gif');           ######################################################           if (function_exists('imagegif')) {             $success = imagegif($thumb, THUMBS_DIR.$name.'_thb.gif');             $thumb_name = $name.'_thb.gif';             }           else {             $success = imagejpeg($thumb, THUMBS_DIR.$name.'_thb.jpg', 50);             $thumb_name = $name.'_thb.jpg';             }           break;         case 2:           ######################################################           # use the new name as the basis for the thumb's name #           ######################################################           $name = basename($newName, '.jpg');           ######################################################           $success = imagejpeg($thumb, THUMBS_DIR.$name.'_thb.jpg', 100);           $thumb_name = $name.'_thb.jpg';           break;         case 3:           ######################################################           # use the new name as the basis for the thumb's name #           ######################################################           $name = basename($newName, '.png');           ######################################################           $success = imagepng($thumb, THUMBS_DIR.$name.'_thb.png');           $thumb_name = $name.'_thb.png';         }         if ($success) {           $result .= "$thumb_name created";           }         else {           $result .= 'Problem creating thumbnail';           }       // remove the image resources from memory       imagedestroy($source);       imagedestroy($thumb);       }     } ?>

I handled a job like this a long time ago. I believe that you have to set imagesavealpha to true.

Sort of like this.

I ended up getting it to work using..

But the colors seem a tad lighter in the new thumbnail? Is that just due to the resizing and keeping transparency?