Simulated view of the HRSC colour mosaic from 2500 km above Valles Marineris, natural colour: Composite of red, green, and blue filter mosaics, with the colour band values in their original proportion to one another. This is closer to what you might see, if you were flying over the surface of Mars.
Download HRSC natural colour mosaic
Image Credit: ESA/DLR/FU Berlin/G. Michael