Mars global surveyor: Mars orbiter camera wide-angle view of Olympus Mons taken in April 1998. This color picture was made using a red wide angle image and a blue wide angle image. The green channel was synthesized by averaging the red and blue bands. Color is not the true color of Mars as it would appear to the human eye (the actual colors woul be more pale and contrast more subdued). North is to the left, east is up.