HELP! I have Lightroom 3 on a laptop as well as on my iMac. I have imported all the same presets to my laptop and yet the photos are not at all the same as my iMac. None of the presets take the same to the exact same files between my laptop and my iMac. Even the Lightroom presets that came in with the program. The histogram is completely different on each of the photos and presets, but the settings and numbers along the right side ( exposure, black, fill light etc..) are matching. This has nothing to do with the screen. I have compared both the files on one computer. I need to figure this out! Please help.