Windows 10 (Fall Creators Update 2017 – winver: 1709) has one neat feature which might be handy for graphic designers and photographers. You can quickly can turn your display quickly to grayscale (black and white).
Some people activates this feature just by accident and they do not know how to turn Windows 10 back to color mode.
The keyboard shortcut is pretty simple:
Color mode of Windows 10:
Grayscale (black and white) mode of Windows 10:
You can read more at Microsoft web site.