Dowload Stuffplug NG from
http://www.stuffplug.com and enable the option "custom sized pics". Add your dp and it will ask you if you want this to be the original size click on yes!
Note : The pic will be only as big as it is normally e.g a 300X300 pic will be 300x300 a 200x200 will be 200x200 hope this helps.
P.S. to get a validation key which you'll need to install. Go here :
http://www.stuffplug.com/?act=generate type your install id (from the installer) into the box and you'll get the key. Paste this into the installer and hopefully it will install.