Yes, but the Viking landers were sensitive to six color wavelengths plus infrared and they had color calibration charts attached to the landers. They knew the t

Yes, but the Viking landers were sensitive to six color wavelengths plus infrared and they had color calibration charts attached to the landers. They knew the true colors of Mars in the 70s. I’ve heard that they colored the sky and rocks red because they thought the public expected red and maybe that’s the reason, but they’ve been transitioning it to an increasingly blue sky and grey rocks ever since.