screen changed colors - looks like a negative photo

[Cowalko]

Hello All:

The screen of my OnePlus 5T changed color on its own.
It looks as if it were a photograph negative; please see the file attached.

How can I revert it to its normal condition?

Thank you!!

 

[Daniel Fernandes]

There will be an option called "Color Inversion" or "Invert Colors" in Settings >> Accessibility. If it's already off, turn it on, then off again...


EDIT: Okay, so I just saw your attached image, and it looks like it's correct. Shouldn't it always be like that?

 

[Cowalko]

There will be an option called "Color Inversion" or "Invert Colors" in Settings >> Accessibility. If it's already off, turn it on, then off again...


EDIT: Okay, so I just saw your attached image, and it looks like it's correct. Shouldn't it always be like that?

Thank you!
Don't know why the screenshot looks good but the solution you pointed out solved the issue.