When satelites go to other planets to study them and take pictures are the pictures in color or black and white? and if they are in black in white how do they know what the color really is when adding color to the pictures?
And this was a lesson hard-learned. The pictures that came back from the earlier Mars landers were manually interpreted, and for years we thought that Mars had a blue sky like Earth. That's why they put the colour calibration on later landers.For the Mars rovers, for example, color calibration is a major problem (it is the Red Planet....) and as such the rovers were sent up with a sundial with color calibration spots on it so that the colors can easily calibrated once the photos are sent to Earth.