I finally cracked and changed the gamma on my photos. I had been using 1.8 (the Mac default) and hadn't realized how terrible that looks on PC systems. Apparently, the PC system I tested it on wasn't using the PC's usual gamma of 2.5, so the photos looked fine. Anyways, I've now gone to using a gamma of 2.2 for all my photos, this will make the photos a bit washed out on the Mac and a bit too dark on the PC, but it won't be as drastic as before (where the photos were way too dark on the PC. There are also some new photos of Estonia and Russia, more to follow!