If I turn on grayscale on my iPhone 6, will the consumption of battery increase or decrease?
iPhone Battery – Will Grayscale Increase or Decrease Battery Consumption?
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Best Answer
It makes no difference on the iPhone 6. So neither a reduction, nor extra consumption.
Some sources that tell the same story:
From a SuperUser question LCD/LED screens; how color affects the power consumption?:
As the iPhone 6 uses a conventional IPS LCD panel, it means that the power usage is mainly due to the backlight - and the backlight power usage does not change whether the displayed image is full color or monochrome. However it does change according to the brightness setting and how dark the displayed image is.
From CNET's article LED LCD vs. OLED: TV display technologies compared: