Is there any software out there that is able to convert a Powerpoint slideshow (either in 2003 or 2007 format) to a series of JPG or PNG images? I'm looking for either standalone software that can do this from the command line, or ideally a .NET library that can be utilized to do the conversion (not holding my breath on that last one).

I know that Powerpoint itself can do the conversion, but it's something I'm looking to integrate into a web application that can't rely on PowerPoint itself being installed.

I've done some searches out there, but all I can really find are either instructions on how to do this in Powerpoint, or software itself that looks like its from a very shady source.