You an use grey scale mode on your phone if you want it to consume less battery power,their is a hidden setting in the Google pixel and nexus phone which lets users enable The grey scale mode on their device,Since this feature is not available openly for these phone,it may work as an overlay,thus having no battery saving benefits.
- To enable this mode,enable Firstly Developer mode on your phone,
- In order To enable developer mode,Goto Setting > About and tap Build number seven times rapidly,
- Now goto Setting > Developer options and find “Hardware accelerated rendering section”,
- Finally click on “Simulate color space” option,and choose”Monochromacy” from the popup.