I have started to use Smug Mug and noticed substantial differences in skin tones. I actually notice this on both PC and Mac but all of my pp is done (for now) in iPhoto. I wrote to Smug Mug about this. They responded in part with an article that Mac screens are incorrectly set to a "display gamma of 1.8" and that it should be reset to a gamma of 2.2 (not that I understand this). Here is the article: http://blogs.smugmug.com/don/2007/02/14/this-is-your-mac-on-drugs/ Is this change still necessary in view of the Mac updates? Is it recommended? If I do it, is it difficult? Can it be undone? Thank you for you help.