The problem may be here
$image->copy($resize, 0, 0, 0, ($newh - 450) / 2, 600, 450);
gd does nice cropping to viewports but this one may be too much if $newh<450
if ($newh<450) {
$image->copy($resize, 0, (450-$newh ) / 2, 0,0, 600, $newh);
}
else {
$image->copy($resize, 0, 0, 0, ($newh - 450) / 2, 600, 450);
]
Trying to copy from outside the bounds of the src image may have introduced the black, just a guess
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