Suddenly the look of everythinenly. Everything is displayed like a negative from film not developed.

[Android Central Question]

I didn't set this it just happened. I'm frustrated enough with the photos camera etc.

 

[Javier P]

Welcome to the forums. What device do you have? Just in case, go to the accessibility settings and make sure that any colour option is switched off.

 

[Tim1954]

The galaxy devices have a negative mode. With Marshmallow triple pressing the home key can make it happen (if it's enabled in settings). With Nougat, since there's no home key any more, you press the power and volume up quickly and that will put you into negative screen (again, if enabled).
To do this manually, - - settings... Accessability.... Vision.... Scroll down to the end and find Negative Colours...