Xperia Z3 screen color contrast

[Olwyn]

I've by mistake adjusted my screen display and it looks like a photo negative now. For the love of sanity I can't find the place where I adjusted that setting to correct it to normal color display. U think it could have been when fiddling with the battery saver app from CM. Please help. Thanks

[Phy]

1. Settings
2. Accessibility 
3.Color inversion

[Phy]

This post might be useful 

http://talk.sonymobile.com/t5/Software-Updates/Lollipop-New-Features/m-p/955490#U955490

[BP6]

Thanks