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It appears you enabled one of the filters.
Go to Menu, Rec, Photo Style
Use the up and down arrows to select Filter Effect then select Off.
You can see the instructions to do this on page 41 of the manual hereftp://ftp.panasonic.com/camera/dmcgx7/dmc-gx7_en_om.pdf
If it is not resolving it, then you have the color set on the viewfinder, so go to Setup [Monitor Display]/ [Viewfinder] and switch it off there.
If you still have an issue then go to Setup, Reset and this will return the camera to default settings which should then resolve it.
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
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