Open up Automator. I remain surprised at the capabilities Automator offers out of the box. As an example, for work I have bitmap images that come from an embed

Open up Automator. I remain surprised at the capabilities Automator offers out of the box. As an example, for work I have bitmap images that come from an embedded system. They get pulled into a folder where a folder action crops them to particular dimensions and converts them into PNGs. The cropping is actually done with a shell script via imagemagick. You can mix and match scripts with Automator actions.