Then I launch a script in terminal to save the clipboard contents to a temporary file, resize by half (72 dpi is half of 144 dpi), and copy the image back to the clipboard.
That section is copied to the OSX clipboard.
I just screengrab, call an alfred workflow, and then paste.ĬMD-CTRL-SHIFT-4 will capture a section of the screen. It's convoluted, but it works, and doesn't interrupt my screen-grab -> paste workflow wildly. Set the destination folder for the image copy (for example: 'To: Pictures') Use OsX embedded Automator to downsize screenshots automatically after they taken.
