I created a folder in my Dropbox to make them easier to share.
(You might also be prompted to do this when you fire up Automator.) There are a variety of ways to create an action, including a macro-like recording screen, but I find it's easiest dragging presets from the left pane into the right pane and then changing the settings.
It's in the applications folder, but you can just press CMD-Spacebar (the hotkey for spotlight) and type Automator.Ĭonstruct a workflow.
