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Originally Posted by Dfrank
The standard images that you are making reference to are in fact opinion. There are no true color images of Mars. NASA can only use the Term approximate true color.
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Cornell University Estimating the True Colors of Mars
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Everyone perceives color differently, and different computer monitors and printers display color differently. However, if viewed on a calibrated monitor or printed on a calibrated printer, these images will provide a good estimate of what we would see if we were there looking over the rovers' shoulder...
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So, looking over the rover's shoulder, on our good monitors, we see such as:
More at
Pancam True Color Images: Sols 51-100
Edit: Compare the "estimates" of the clumsy image manipulator Dfrank likes to cite:
Corresponding sol 74 image Corresponding sol 71 image