Thanks for clarifying what's happening; I didn't realize some Galleries crop be design (I assumed images would always just be resized!).
I searched on "change image size" and found several interesting posts and I think I'm starting to see how this works, but I have a couple of questions:
1) It looks like the "c" and "p" indicate "cropped" and "proportional" - can I just change the "c" in the URL in index.php for slideshow_disssolve to get it to resize rather than crop? Do I need to reprocess all of the images for this to work and how would I do that?
2) Reading the posts confirms a response you gave me on a previous post and that is that images are actually resized when they are "uploaded". Plus, I guess thumbnails are also created. A) where are the resized images stored and B) where are the thumbnails placed?