Comic book theme?

[makimball]

All right here it is! Out of the blue, my display changed to the comic book effect as in photo booth! My guest login has not changed. I do not have a clue how to change it back. I did not even know that it could change this way.
Any ideas?

makimball

 

[GGJstudios]

Are you sure you're not referring to inverted colors?

If that's the case, press Command + Option + Control + 8

 

[makimball]

Command-option-control-8 inverted the colours.

Thanks but that was not it.