Sorunu çıkaran nokta.

$dst_r = ImageCreateTrueColor($targ_w, $targ_h);
imagealphablending($dst_r, false);
$colorTransparent = imagecolorallocatealpha($dst_r, 0, 0, 0, 0x7fff0000);
imagefill($dst_r, 0, 0, $colorTransparent);
imagesavealpha($dst_r, true);

Yukarıdaki kodlar nedense hiç çalışmıyor gibi.