Your code has almost everything you need to accomplish it, you just need to save the image somewhere and include it in the page. You will need to setup a directory your script can write files to, which is also accessible from the web, but how to do that is dependent on your web server...
my $img = join('.',time(),$$,'png');
open(OUT,">tmpimages/$img");
print OUT $gd->png;
close(OUT);
print "<IMG SRC=\"$img\">\n";
Of course you will also have to change your script to emit text/html rather than text/plain for a content-type.
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