Just a small tips to show you how to pick color out of Photoshop. You can use eyedropper tool to pic color of the screen even it is not inside Photoshop window. You tried this before, choose eyedropper and start picking color. It works inside Photoshop but if you try to re-size Photoshop window and move your mouse out of Photoshop windows, the cursor become normal. It seem we cant pick color out of Photoshop window using eyedropper tool.
mouse move out of Photoshop
Normally we think about a solution. we take screenshot and open it in Photoshop to pick the color. But i have a faster way. We still use the eyedropper tool but this time, inside Photoshop we click and hold left mouse down while dragging mouse out of Photoshop. This time we can bring eyedropper tool to everywhere on screen to pick the color we want. Cheer up!
eyedropper can go out of Photoshop