Just a note: I don't have a Macintosh to work with, so some commands may be different. I'll trust if you already have a Mac you know enough about what you're doing in Photoshop to figure things out.A few years back my college newspaper sent me on a conference for newspaper editors. Besides for the non-existant all-night partying for which I did not take part of or get drunk because that is against school policy, there were a few learning sessions, in which the top journalists and editors in the field would come speak to us and teach us.One of the lectures was the photography editor for National Geographic, who took us through some advanced tricks in photoshop. His whole lecture took an hour, but I ended up walking out of that session with more knowledge of photoshop than I ever learned from one of those self-help books. I'd like to impart that knowledge to you today.