I don't know for how long this post has been here. But I stumbled upon similar problem now. Hence posting the solution so that it might help others.
#!/usr/bin/env perl
use strict;
use warnings;
use utf8;
use GD::Graph::pie;
use MIME::Base64;
my @data = (['A','O','S','I'],[3,16,12,47]);
my $mygraph = GD::Graph::pie->new(200, 200);
my $myimage = $mygraph->plot(\@data)->png;
print <<end_html;
<html><head><title>Current Stats</title></head>
<body>
<p align="center">
<img src="data:image/png;base64,
end_html
print encode_base64($myimage);
print <<end_html;
" style="width: 888px; height: 598px; border-width: 2px; border-style: solid;" /></p>
</body>
</html>
end_html
use mod_rewrite to redirect the call to file.html to image.png without the url changing for the user
Have you tried just renaming the image.png file to file.html? I think most browser take mime header over file extension :)
Quick google search says you can embed it like this:
<img src="data:image/gif;base64,R0lGODlhEAAOALMAAOazToeHh0tLS/7LZv/0jvb29t/f3//Ub/
/ge8WSLf/rhf/3kdbW1mxsbP//mf///yH5BAAAAAAALAAAAAAQAA4AAARe8L1Ekyky67QZ1hLnjM5UUde0ECwLJoExKcpp
V0aCcGCmTIHEIUEqjgaORCMxIC6e0CcguWw6aFjsVMkkIr7g77ZKPJjPZqIyd7sJAgVGoEGv2xsBxqNgYPj/gAwXEQA7"
width="16" height="14" alt="embedded folder icon">
But you need a different implementation in Internet Explorer.
http://www.websiteoptimization.com/speed/tweak/inline-images/
The 64base method works for large images as well, I use that method to embed all the images into my website, and it works every time. I've done with files up to 2Mb size, jpg and png.
Source: Stackoverflow.com