open up all your images then use the command on the PC (sorry I am unsure of the Mac commands. (I could check)
CTRL + A will select the images one by one then you can drop them into your new document. You should get a marching ants box appear around the image!
i.e we preset size 600 * 800 at 72 dpi resolution white background and drag the images 1 by one into it.
I hope it helps.
Bookmarks