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  1. or download this
    my $image = GD::Image->new(1, 1);
my $transparent = $image->colorAllocate(0, 0, 0);
$image->transparent($transparent);
  2. or download this
    my $image = GD::Image->newTrueColor(1, 1);
$image->alphaBlending(0);
$image->saveAlpha(1);
my $transparent = $image->colorAllocateAlpha(0, 0, 0, 127);
$image->setPixel(0, 0, $transparent);