(You can lock horizontal or vertical position as well, by typing Cmd + X or Cmd + Y.) If you want to lock the position of the mouse into the Digital Color Meter so that the colors don’t change when you move the mouse, type Cmd + L. It would also be good to allow the Color Picker to be opened from within the Digital Color Meter.
NOTE TO APPLE: It would be GREAT to have the Digital Color Meter talk to the Mac Color Picker, allowing us to sample a color, then paste those values into the Color Picker. You can copy these color values as text or an image, but, in a missed opportunity, you can’t paste these into the Mac Color Picker. You can display the color your mouse is hovering over in a variety of different color spaces. What this allows you to do is find the value of any color displayed anywhere on any computer monitor connected to your system.
(There’s a workaround, which I’ll explain in a minute.) It’s tricky to screen shot because as soon as you move the mouse, the colors it displays change. Hidden deep inside the Utilities folder is a very cool Mac program that allows you identify any color on your screen, copy its values or color, and copy them into another app - EXCEPT the Mac Color Picker, which makes no sense for a tool this useful.
