Why is my phone in negativity look

[AC Question]

My photos look like negatives and my background has changed color

 

[Tim1954]

You can change that back from settings... Accessibility... Vision... Negative colours...

 

[belodion]

Try Settings, Accessibility, Invert Screen Colours. That affects everything on the display however, not just photos and backgrounds. Tell us if no go:

https://forums.androidcentral.com/showthread.php?t=409154

Edit: Posted same moment as previous post.