Upload Thumbnail Transparency

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i have upload code that makes a thumbnail of the image.

but with GIF and PNG files it dosnt save the transparency in the thumbnail, it just makes it black.

is there any way to save the transparency in the thumbnail?

 

the thumbnail code i have:

 

<?php
$filename = "test.jpg";
$filename2 = "test_thumbnail.jpg";
$width = 180;
$height = 180;

list($width_orig, $height_orig) = getimagesize($filename);
$ratio_orig = $width_orig/$height_orig;
if ($width/$height > $ratio_orig) {
   $width = $height*$ratio_orig;
} else {
   $height = $width/$ratio_orig;
}
$image_p = imagecreatetruecolor($width, $height);

imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

 

but here is the main code i have for php resize:

<?php
$image = imagecreatefrompng($filename2);
imagealphablending($image_p, false);
imagesavealpha($image_p, true);
imagepng($image_p, $filename2, 6);

 

and for GIF:

<?php
$image = imagecreatefromgif($filename2);
imagealphablending($image_p, false);
imagesavealpha($image_p, true);
imagegif($image_p, $filename2, 100);

 

can anyone help me?