Although it seems that this picture shows the Martian surface, there is the question whether it is indeed the Martian surface or a similar terrain on Earth.
Imagine, it is a location on earth, how credible are all the images of all the Mars Rovers, including the Curiosity. But...if it is an image of the Martian surface and the image is not edited than NASA has something to explain.
Here is the original raw image link: http://areo.info/mer/spirit/2114/2P314036828EFFB270P2558L5M1 L2L5L5L7L7.jpg
Site: areo.info/mer Note: Aero.info/mer is not from NASA or JPL. Aero.info/mer just collect and copy the images from the NASA site and publices it on their own site.