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Talking about with windows 10. I didn't realise until just now that windows10 has a night monitor screen auto change over from day time setting. It was driving me nuts having to reset the monitor each time I thought it was possibly a graphics card fault.
Why on earth did microsoft add such a stupid setting? among others in the program , totally unnecessary
One of the many new features introduced in the Windows 10 Creators Update is Night Light, a system-wide feature that changes the color temperature of your display to reduce eye strain in the evening hours. Windows 10 Night Light is similar to the Night Shift feature found in macOS and iOS, and to third-party applications like f.lux. It’s based on research which suggests that the cool, blue light common to most computer displays can cause eye strain and interfere with your natural sleeping patterns.
Night Light, and its equivalents from other platforms, addresses this issue by shifting the color temperature of your display towards the warmer, redder end of the spectrum. The feature can be turned on manually as needed, or configured to automatically turn on gradually as the day goes on. In theory, this should reduce eye strain and minimize the negative effects that long hours in front of a computer can have on your sleep.
I've just tried it on W10 (it's "OFF" by default) and I found, as the article goes on to say,:
Night Light obviously makes changes, often drastic, to your displays color temperature, and that can really mess with any work or entertainment that relies on color accuracy. Therefore, Night Light is fine for casually browsing the web, checking emails, or working on documents and spreadsheets, but you’ll probably want to turn it off when editing photos and videos, playing certain games, or catching up on your Netflix queue.