Thanks for everyone's help on my previous Image::Magic related question. However, now that I got the fonts resolved, I am now having difficulties with creating a semi-transparent background in which I could draw my text. I have search here but did not find the answer. Similarly, the available documentation is not very helpful. My code so far is this

use strict;
use Image::Magick;

my ($image, $x);
 
$image = Image::Magick->new;
$x = $image->Set(size=>'100x100');  warn "$x" if $x;
$x = $image->ReadImage('xc:none');  warn "$x" if $x;

$x = $image->Draw(primitive=>'rectangle', points=>'5,5,50,25', fill=>'
+white'); warn "$x" if $x;
#$image->MatteFloodfill(x=>6, y=>6, matte => 90);  <== gives 'Unrecogn
+ized option (matte)' error
$x = $image->Annotate(font=>'/usr/share/fonts/bitstream/Vera.ttf', fil
+l=>'#00FF00', pointsize=>12, x=>10, y=>20, text=>'Hi'); warn "$x" if 
+$x;

$x = $image->Write('x.png');        warn "$x" if $x;
undef $image;
[download]

What I now want is to figure out a way to make the rectangle semi-transparent. Please help.