When running a CGI you need to output (print) what the browser shall see. Normally this is HTML-Code, but plain text or images are fine, too.

First of all you need to print a header containing the content-type and two newlines:

print "Content-type: image/png\n\n"
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... and remove that line saying: Context: ....

This should work for a trial.

I would further encourage you to use strict;, enable warnings (-w) AND use CGI;.

#!/usr/bin/perl -w
use strict;
use CGI;

my $q = CGI->new;
print $q->header("image/png");

## later
print $im->png;
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I'm sure, GD is not to blame.

alex pleiner <alex@zeitform.de>
zeitform Internet Dienste