$to_print = "some string";
my $im = newFromJpeg GD::Image("somefile.jpg");
my $black = $im->colorExact(0,0,0);
#also tried $im->colorAllocate(0,0,0);
$im->stringFT($black, '/Open_Sans/OpenSans-Bold.ttf' ,12, 0, 100, 50, $to_print);