in reply to Visualizing HUGE integers.
Actually, I think you might want to reconsider SVG.
Firefox supports the features that I think you will want (you're a little vague), and even IE with the Adobe plug-in works very well.
But even better, the drawing program Inkscape reads and writes SVG and can export images in PNG format (not to mention a long list of other formats).
Inkscape home page: http://www.inkscape.org/.
Inkscape Wiki: http://wiki.inkscape.org/wiki/index.php/Inkscape.
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