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Originally Posted by Neverfly
Grand Lunar, your fixation over false color and "blue water" is beginning to get wearing.
The issue is not about the color.
Again.
I encouraged Dfrank to present his case here because, off the top of my head, I don't know all the science to refute his claims.
It is NOT about the COLOR.
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Grand Lunar is asking a fair question. Given that this is a "look at the picture" opinion based argument, and given that standard images of the area are available, it's reasonable to ask what the parameters were that went into this, and why this particular one (not one of the standard images) is being used. In a more famous case, there was an image published in New Scientist based on something that Ron Levin did. In that case, there were what appeared to be Martian gullies filled with blue water. In fact, this was on a steep cliff (which could be determined by studying some of the non-image data available) and the proper color (verified by the color reference on the rover) was various shades of reddish brown. There was no bright blue in an approximate real color image. By the way, Levin later retracted his claim.
The point is that false color and processed images can be very misleading if you try to look at them like photographs - which is what's happening here. You can't talk about color or contrast differences without understanding why there are color or contrast differences in an image.
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I have seen all the hortonheardawho photos and discussed them. IT LOOKS LIKE WATER. color or not.
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See above. THEY'RE NOT PHOTOS, and can't be treated as such. They're processed images.
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It does look like water though and I was hoping that for all the people out there that think they see water too, they might find good scientific answers to why it isn't.
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It's been explained repeatedly in the Dfrank threads that given the low pressure on Mars there is only a very narrow range where liquid water would be stable. It's usually too cold. On some summer days the atmosphere in some locations would get too hot. The ground would tend to be much colder (freezing). Liquid water would be ephemeral at best.
Given that, it is up to DFrank to provide evidence - not "look at the picture arguments - for his position.
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Sadly, although Dfrank presents his case well one on one, he seems to flub it on the forum. Stage fright? I dunno. Hes getting better.
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I'm afraid I haven't seen his argument go beyond an opinion about an image.
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But deviating constantly to the color issue when it isn't an issue is distracting.
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Hopefully you now understand why it is important to the subject.