This is a very silly one, but easy to do in practice:
Download process graph applet.
Use settings to set delayed screenshot to 3 secs.
Open the image you want to send in normal image viewer.
Set screenshot to be taken
Go to fullscreen mode
Wait a few secs.
You should now have a nice scaled image in your images folder.

I surely hope there is a better way as well, but I thought that this might work for you as well.

I seriously think someone should port a small easy-to use and simple image app for 770 for digi pic fixing purposes.