Thank you all Monks. I am using GD::Graph::linespoints
I tried
$mygraph->set_title_font(GD::gdGiantFont);
It does what I want for right now. Also, I don't think my fonts are in /fonts. I need to look for them.
Thank u all for the wonderful support. Sometimes it can get lonely in the perl world of debugging.
Regards,
Rakhee