Everyone here should look at downloading jing. I've been using for awhile and I know Matt used for a short recording, up to 5 min. Will take you about 15min to learn to use and a ton quicker than using screencapture and then png files. Can literally pull up and post chart in about 10seconds. And it's FREE.  Think someone else posted something about the other day. Great tool.

http://www.jingproject.com/