To successfully export a perl GD::Graph object to a graphics file (e.g. a .png file), do you do the following ?

# Set graph data

$graph->set(....);
$graph->plot(\@graph_data);
open(IMG,'>file.png') or die $!;
binmode IMG;
print IMG $graph->png;
close IMG;

I managed to solve the problem.

It was a case of using the 'require' keyword to include an external perl script and invoking the method contained within it in order to properly create a graphics file.

In my case Im using GDGraph-1.44_01 package, so you MUST include the following in your perl script at all times

# At the start

require '/complete path name of save.pl/save.pl


# When you want to export to a graphics file

save_chart($graph,$graph_title);