Unfortunately, I never did revisit this in an attempt to get this to work. I wouldn’t give up hope, though, as there are RMagick and ImageMagick gems/libraries built specifically for Windows. If you could code your script so that it loads a different gem based on your platform, you may end up with a working solution. Just a thought. Sorry I can’t be of more help, but I am curious if that works out for you.
http://rubyforge.org/projects/rmagick/ has the win32 gem
http://www.imagemagick.org/script/binary-releases.php#windows has the windows imagemagick binary
Good luck!
]]>