imagecreatefromgif & imagecolortransparent() ??

Hi all, the simple code snippet:

header('Content-type: image/gif');
$im = imagecreatefromgif("/path/Mypic.gif");
$background = imagecolorallocate($im, 255, 255, 255);
imagecolortransparent($im,$background);

imagegif($im,'/path/TransparentPic.gif');
imagedestroy($im);


is creating the new image but is not setting the white background to
transparent;
I am sure about the presence of the white color in the background
(checked it with imagecolorat() etc).

a similarly simple test setting transparency on a new image created
with 'imagecreatetruecolor()' works correctly... any hints?!

Cheers, Luca
.

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