I went to a lecture by Geoffrey Landis of Nasa at the Eastercon Science Fiction convention in the UK. He worked on the last rover, and explained how to infallib

I went to a lecture by Geoffrey Landis of Nasa at the Eastercon Science Fiction convention in the UK. He worked on the last rover, and explained how to infallibly tell if the colour is false. There is no blue on Mars. Most false colour pictures end up making part of the landscape blue, which is both a give-away, and incorrect. Probably what you'd actually see would be less colourful and more dusty, given the pictures he showed us.