GD Transparency PNG

So I basically have this:

$img = imagecreatefrompng('assets/other/redcircle.png');
imagepng($img);
imagedestroy($img);

So the redcircle.png file has a transparency (with anti aliasing). Bu开发者_运维百科t GD just turns all the transparency in black? Is there a way to get back the original transparency?

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You have to tell GD to save the alpha using imagesavealpha: http://www.php.net/manual/en/function.imagesavealpha.php