I omitted to say that you need to reduce their size on the computer. I took it as read that this was apparent, as it would, as you say, be a waste of time.
I do this all time with my pictures to Photobucket as well. It certainly speeds up the transfer of data. My camera delivers pictures at 2.5 megs each, so they are reduced to 400k for onward transmission. My pictures on the Mayhem site have to reduced to 100k or under, so I end up three sets of pictures stored on my machine all of different sizes.
( it's a good job I've two terabytes of memory in there..... te he )
Hope this clears things up
ken