There is a hidden feature in almost every an Android device, that is monochromatic display. This feature is been been beneficial for OLED devices as it would save 90% of battery life and for night readers as black and white display strains the eye to minimal. How to turn this on?
Head to “About phone” under settings menu
and tap on “Build number”, 7 times and a popup will show “You are now a developer!”
and tick the Developer options on, then scroll down further and you’ll find an option “Simulate colour space“
and select “Monochromacy”.
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