“Sands of Mars” Source: Mars Exploration Rover Opportunity
From a number of images taken by the Mars Exploration Rover Opportunity, this picture was constructed by Jim Plaxco, a digital artist, photographer and owner of Artsnova (http://Artsnova.com). Individual frames were all taken by Opportunity’s Left Panoramic Camera, with each frame being exposed using a different filter.
“Alien Spectrum” Source: Viking Lander 1
This second image is also hosted by the Mars Art Gallery, which was formally launched in March 2005 to serve as “a showcase for artistic renditions of Mars based on data returned by robotic missions.” The above image, titled “Alien Spectrum” has been processed to depict Mars as it might be seen by: “eyes not of this Earth. Evolution has given humans a set of eyes that are responsive to a particular range of electromagnetic radiations and we perceive those radiations as color.” A wallpaper image and more information can be found here: http://www.marsartgallery.com/s_alienspectrum.html