Hi, I'm currently in the very early stages of learning photography. I've bought a Canon 350D and have been spending the last few weekends out in the Northern Ireland countryside taking pictures to build a nice portfolio of pictures and to improve my technique. I'm having one problem however, which I can't figure out how to solve. Basically, when I take my pictures home and upload them into iPhoto, they look great, good exposure and colours etc. However, when I view the same photos from a Windows PC in work, the photos appear very underexposed. To give you an example, check out the following pictures: Giant's Causeway, County Antrim Silent Valley, County Down Could anyone with more experience please tell me why these pictures look very underexposed in Windows, but perfect on the Mac? What can I do to ensure it doesn't happen in future?