After switching off Night Light/Blue Light filter, screen looks more bluish but the real-world looks normal. If the eyes are adapted to red, everything should look bluish.

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After switching off Night Light/Blue Light filter, screen looks more bluish but the real-world looks normal. If the eyes are adapted to red, everything should look bluish.

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The world is not a display on a monitor with RGB values. When using a proper filter, the hardware emits less Blue values so things start looking strange. Blonde colours appear pink, greens start not looking so green, so on and so forth. Nothing changes about the real world, you’ve still got the sun and you’ve still got light acting the same. Your eyes will not “adapt” to the lack of blue light coming from a *single* light source in the same way that you adapt to the lack of/presence of light in general.

You adapt to changes in color in two ways, one is the purely mechanical way your cones are excited, the other is how your brain processes visual information.

You do get an imprint of the negative colors of the screen in your eyes, if your sceen is bright enough your brain will not filter out that imprint. But the thing is your brain magnifies the importance of the screen, while it actually takes up a small portion of your visual field. So only a small rectangle is tinted towards blue, and when you look at the screen, it naturally perfectly overlays the screen. When you look at something else in the world, it is still only that small rectangle at the center of your vision that is tinted blue. If the screen isn’t very bright before looking away, your brain corrects the colors to match the surrounding visual information.

Compare this with wearing orange tinted sunglasses, which takes up almost your entire field of vision, when taking them off, now the entire world looks bluish.