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Yes, just click the tool within the PS image window and then, keeping the button down, move outside the window.
 
No probs!🙂
It was easy but I had to double check it did actually work and it wasn't just something I'd dreamt up.😀

Thanks for the tip! I know Flash can let you select any color on screen like that, but I didn't know this trick that lets Photoshop do the same.

Thanks! 😉 😀
 
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