What I want to do is use basic video effects, much like those found on photobooth, during a webcam chat on Skype. Back when I used my PC, I was able to easily change things like the contrast, gamma, etc. during video conversations. Essentially I would like to know how I can do that (and hopefully more?) on my new macbook pro. Also, my friends skyping me have been showing off their ability to mask their voices on skype, so when they talk their voices are much deeper. I find this highly entertaining, but when I asked how this was achieved, they said they couldn't begin to tell me how on a mac. Can you?