imagecreatetruecolor

Jeg har et problem med imagecreatetruecolor:

Kode:
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$dest_width = 99;
$dest_height = 99;
$quality = 90;

$src_img = imagecreatefromjpeg("images/AUT_0041.jpg");
$dst_img = imagecreatetruecolor($dest_width,$dest_height);
imagecopyresampled($dst_img, $src_img, 0, 0, 0, 0, $dest_width, $dest_height, $src_width, $src_height);
imagejpeg($dst_img, "/images/new_file.jpg", $quality);


imagedestroy($src_img);
imagedestroy($dst_img);
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Mit nye billede er bare en sort firkant hvad er problemet?