Screen Color Picker
Invoking the screen color picker
To activate the screen color picker, click on the eyedropper icon in the top right corner of the window.
Alternatively, you can also use the ⌘I keyboard shortcut.
Zooming in and out
Use the + and - keys to zoom in and out, respectively.
Picking multiple colors
Keep the shift key pressed while picking colors. This prevents the color picker from closing after a color has been selected.
Dismissing the color picker
To exit the color picker without selecting any colors, press the esc key.