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Originally Posted by indian_samosa
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I went through the explanations provided here as well as on badastronomy.com, but I'm not entirely convinced.
Both of them states that the Blue tab used in the sundial is very bright in the infra red region, i.e. they reflect infra red light which is invisible to the eye but visible to the camera because they used an infra red filter. That's why the blue tab appeared red. Now he also states that the colours in the image were adjusted so that they represent the true colours as close as possible. Now how on earth a camera with an infra red filter could represent the "true" colours? Does human eye see infra red? So all the redness in the image is due to infra red which is invisible to the human eye. So any person on Mars would not see the red in Mars becauseits in the infra red region. How does that make a "representation" of "true" colours of Mars? Thats ridiculous.