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);  
  ]

[download]

Trying to copy from outside the bounds of the src image may have introduced the black, just a guess

In reply to Re^3: GD colorAllocate not changing colour by huck
in thread GD colorAllocate not changing colour by Bod

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