Why does my Galaxy S5 turn into black and white after a few second of full color?

[AC Question]

why my galaxy s5 turns into black and white after a few second of full color.

why my galaxy s5 turns into black and white after a few second of full color.

 

[prolongExistence]

Re: why my galaxy s5 turns into black and white after a few second of full color.

Im not sure if the s5 has it or not but the s6 has Ultra Power Save Mode which, among other things, turns the screen into grayscale. Do you have it & is it enabled?