Another way to produce the same effect with a Windows computer is to go to "Colour Inversion". First, turn on Magnifier, by pressing the Windows logo key simultaneously with Plus (+) on the keyboard. Now hold down the Windows logo key and press the "-" (minus) key to bring the display size back down to 100%. (Press Windows logo key + Esc to turn Magnifier off.) To turn Magnifier on and off using a touch screen or the mouse, select Start > Settings > Ease of Access > Magnifier and use the toggle under Turn on Magnifier. With Magnifier turned on as described above, hold down the Ctrl and Alt keys simultaneously and then press lower case "i" to toggle between normal and inverted screen. This way works with the screen display for all web sites and all documents. An advantage to Dark Shack is that graphics still turn out normal; with Windows Inversion, photos and other graphics appear as a photographic negative.
Dark Shack is very nice, and even better if you are using it late at night. I use f.lux to shift the color temps on my displays to warmer and less blue at night to make it easier to go to sleep. Dark Shack works really well in that mode.
