How do I convert image files to .edj format from the command-line?

I have recently installed the E17 fork, Moksha, on my Sabayon Linux machine the problem is that the graphical tools for changing the wallpaper to JPG or PNG files are causing me grief (and yes I have tried to get support for this from the Bodhi Linux community, see [this forum post](http://forums.bodhilinux.com/index.php?/topic/12735-cant-change-wallpaper-in-moksha/)) , but I seem to be able to use wallpapers (including animated ones) in .edj format quite easily. So I was hoping that someone would have a shell script (that's simple enough for me to be able to use) or something I can run from the command-line to convert my JPG and PNG wallpapers to the .edj file format.