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Resize Transparent PNG


I have a basic script to resize a transparent png image. Code:

$dimg = imagecreatetruecolor($newwidth, $newheight);
imagecolortransparent($dimg, imagecolorallocate($dimg,0,0,0));
imagealphablending($dimg, false);
imagecopyresampled($dimg, $simg, 0, 0, 0, 0, $newwidth, $newheight, $currwidth, $currheight);


Problem is that my nice drop shadows are lost in resize. Does anyone know how I can keep them ?




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