Dear Monks,
I am playing around with some statistics in Perl and I seem to have a (probably) very simple problem. In this code:

use GD::Graph::boxplot;

$labels = ["one", "two", "three", "four", "five"];

# since 'do_stats => 0', data are [mean, lowest, lower-%, median, uppe
+r-%, highest]
# where lower-% and upper-% are the bottom and top of the box 

$one = [     [-10, -100, -50, -20, 40, 100],
        [20, 0, 10, 15, 25, 35],
        [50, -10, 35, 45, 75, 110],
        [80, 40, 55, 70, 100, 105],
        [110, -40, 55, 90, 120, 140] 
    ];

$two = [    [45, -100, 20, 55, 80, 140],
        [55, -40, 30, 50, 70, 90],
        [40, -10, 35, 41, 45, 70],
        [50, -120, -10, 35, 75, 150],
        [60, 35, 50, 65, 70, 80]
    ];

$three = [    [0, -25, -18, 3, 20, 32],
        [0, -15, -10, 2, 17, 22],
        [0, -12, -9, -1, 7, 10],
        [0, -45, -28, -4, 25, 42],
        [0, -10, -7, -1, 5, 8]
    ];


@data = ( 
    $labels, $one, $two, $three
    );
    
$my_graph = new GD::Graph::boxplot(640, 480);

$my_graph->set(
    x_label        => 'X-Label',
    y_label        => 'Y-Label',
    title          => 'Title',
    do_stats       => 0,
    symbolc        => 'black',
    y_min_value    => -150,
    y_max_value    => 200
    );

# Output the graph 

$gd = $my_graph->plot(\@data);

open(IMG, '>sample03.png') or die $!;
binmode IMG;
print IMG $gd->png;
[download]

can you add something so that my image is not transparent? I can't see anything when it is created..