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Color snap-shots from Viking 1 (3)
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"...The scene has a reddish or orangeish cast. Figure (2) is constructed by incorporating data from an accompanying IR picture and using the spacecraft's test charts, in this way accounting for out of band contributions and atmospheric colorations.
The scene is shown as it might appear "on Earth". For example, if you could pick up one of the boulders and transport it to your back yard, this is the color you would observe. Note that, relative to figure (1), the reddish tint is subdued, replaced with a brown hue.
Figure (3) shows the scene as it would appear "on Mars". The yellowish cast of Sunlight filtering through the atmospheric dust imparts a similar yellowish hue to the entire scene".
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