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Color imaging useful for Mars analysis? Robert Clark 10-13-2007
Posted by Robert Clark on October 13, 2007, 6:48 pm
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 News: NASA Orbiter Provides Color Views of Mars Landing Site
Candidates.
10/10/07
"Beginning this week, images will be released in color as well as
black-and-white on the camera team's Web site. The colors are false
color, not the way Mars would look to human eyes. The images are
processed to maximize color differences, a technique useful for
analyzing landscapes.
"Color data are proving very useful in interpreting geologic processes
and history on Mars," McEwen said. "The images we're releasing today
include views of some of the most interesting and compositionally
diverse areas on the planet."
...
"Color is a boon to geologists who have been trying to discriminate
different surface materials and their relation to the topography,
McEwen said. "Color clearly identifies basic material distinctions
like dust, sand or rocks, light-toned layered material, and frost or
ice," he said. Color also helps geologists correlate layers in the
Martian terrain. And scientists will be able to combine data from the
high-resolution camera and the imaging spectrometer to make detailed
maps of minerals and soil types on the planet."
http://www.jpl.nasa.gov/news/news-print.cfm?release=2007-116

This report is on false-color images to be released where color
differences are exaggerated. But McEwens phrasing suggests he means
his comments as a general statement about color imaging.


Bob Clark


Posted by Jan Panteltje on October 14, 2007, 6:39 am
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 On a sunny day (Sat, 13 Oct 2007 15:48:10 -0700) it happened Robert Clark

>
> This report is on false-color images to be released where color
>differences are exaggerated. But McEwens phrasing suggests he means
>his comments as a general statement about color imaging.
>
>
> Bob Clark

I have always been disappointed with the BW pictures send back by NASA.
ESA got it right first time, with beautiful color images, 3D too,
and TRUE color images on top of that.

Clearly also false color images provide an extra dimension that
can show some parameter of the landscape.

But we are used to watching in color.
There is the endless 'variation' or 'discussion' about
what mars would look like to us if we were standing there.

The human eye does very much of an auto white balance, we
do not perceive a white shirt very different outside in the sun
or inside with different color temperature light, we get 'used' to
the different light.
So I think all the reddish mars pictures will NOT be the way we will
see things once we are actually there.

Now what can it show? Lets look at ESA Reull Vallis:
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=34508
Actually this is supposed to be a true color picture (whatever white balance
was used, and whatever primary colors were used, was discussed in sci.astro a
long time ago, along with technical details of the camera).

But when I enlarge this, MORE is shown:
http://panteltje.com/panteltje/space/mars/lake2color.jpg
Note the green and blue, and the green surrounding the blue.
*Could* that be water (frozen?) with vegetation?
Remember the Russians found chlorophyll in the mars spectrum?
So let's zoom in a bit closer:
http://panteltje.com/panteltje/space/mars/lake2colordetail.jpg
Personally I would like a closer up of that place :-)

OK, maybe you do not believe for religious reasons in life on mars,
so look here then:
http://panteltje.com/panteltje/space/mars/easthills-bunny.jpg

First we were not at the centre of the universe,
then we were not the only life form,
now we are found to have no free will,

But we can see color!


Posted by Robert Clark on October 14, 2007, 11:01 am
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> On a sunny day (Sat, 13 Oct 2007 15:48:10 -0700) it happened Robert Clark
>
>
>
> > This report is on false-color images to be released where color
> >differences are exaggerated. But McEwens phrasing suggests he means
> >his comments as a general statement about color imaging.
>
> > Bob Clark
>
> I have always been disappointed with the BW pictures send back by NASA.
> ESA got it right first time, with beautiful color images, 3D too,
> and TRUE color images on top of that.
>
> Clearly also false color images provide an extra dimension that
> can show some parameter of the landscape.
>
> But we are used to watching in color.
> There is the endless 'variation' or 'discussion' about
> what mars would look like to us if we were standing there.
>
> The human eye does very much of an auto white balance, we
> do not perceive a white shirt very different outside in the sun
> or inside with different color temperature light, we get 'used' to
> the different light.
> So I think all the reddish mars pictures will NOT be the way we will
> see things once we are actually there.
>
> Now what can it show? Lets look at ESA Reull Vallis:
> http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=34508
> Actually this is supposed to be a true color picture (whatever white balance
> was used, and whatever primary colors were used, was discussed in sci.astro a
> long time ago, along with technical details of the camera).
>
> But when I enlarge this, MORE is shown:
> http://panteltje.com/panteltje/space/mars/lake2color.jpg
> Note the green and blue, and the green surrounding the blue.
> *Could* that be water (frozen?) with vegetation?
> Remember the Russians found chlorophyll in the mars spectrum?
> So let's zoom in a bit closer:
> http://panteltje.com/panteltje/space/mars/lake2colordetail.jpg
> Personally I would like a closer up of that place :-)
>
> OK, maybe you do not believe for religious reasons in life on mars,
> so look here then:
> http://panteltje.com/panteltje/space/mars/easthills-bunny.jpg
>
> First we were not at the centre of the universe,
> then we were not the only life form,
> now we are found to have no free will,
>
> But we can see color!

Another great place to check in color would be Valles Marineris.
There was this great color picture taken by Mars Express:

http://sciforums.com/attachment.php?attachmentid=3999

Based on Viking images it had earlier been concluded that regions of
high color variability could be due to past liquid water interaction.
One such region was Reull Vallis as you noted:

Newsgroups: alt.sci.planetary, sci.space.history, sci.astro,
sci.astro.amateur, sci.geo.geology
From: rgregorycl...@yahoo.com (Robert Clark)
Date: 28 Jul 2002 00:58:40 -0700
Local: Sun, Jul 28 2002 3:58 am
Subject: Liquid water on Mars and regions of high color variability.
http://groups.google.com/group/sci.astro.amateur/msg/14d152929642e500


Bob Clark


Posted by Jan Panteltje on October 14, 2007, 11:17 am
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On a sunny day (Sun, 14 Oct 2007 08:01:02 -0700) it happened Robert Clark

>> Now what can it show? Lets look at ESA Reull Vallis:
>> http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=34508
>> Actually this is supposed to be a true color picture (whatever white balance
>> was used, and whatever primary colors were used, was discussed in sci.astro a
>> long time ago, along with technical details of the camera).
>>
>> But when I enlarge this, MORE is shown:
>> http://panteltje.com/panteltje/space/mars/lake2color.jpg
>> Note the green and blue, and the green surrounding the blue.
>> *Could* that be water (frozen?) with vegetation?
>> Remember the Russians found chlorophyll in the mars spectrum?
>> So let's zoom in a bit closer:
>> http://panteltje.com/panteltje/space/mars/lake2colordetail.jpg
>> Personally I would like a closer up of that place :-)
>>
>> OK, maybe you do not believe for religious reasons in life on mars,
>> so look here then:
>> http://panteltje.com/panteltje/space/mars/easthills-bunny.jpg
>>
>> First we were not at the centre of the universe,
>> then we were not the only life form,
>> now we are found to have no free will,
>>
>> But we can see color!
>
> Another great place to check in color would be Valles Marineris.
>There was this great color picture taken by Mars Express:
>
>http://sciforums.com/attachment.php?attachmentid=3999
>
> Based on Viking images it had earlier been concluded that regions of
>high color variability could be due to past liquid water interaction.
>One such region was Reull Vallis as you noted:
>
>Newsgroups: alt.sci.planetary, sci.space.history, sci.astro,
>sci.astro.amateur, sci.geo.geology
>From: rgregorycl...@yahoo.com (Robert Clark)
>Date: 28 Jul 2002 00:58:40 -0700
>Local: Sun, Jul 28 2002 3:58 am
>Subject: Liquid water on Mars and regions of high color variability.
>http://groups.google.com/group/sci.astro.amateur/msg/14d152929642e500
>
>
> Bob Clark

I am looking through those things, nice pdf about Pathfinder :-)
When we look a bit more into the past, to the Viking mission,
you can really learn about color calibration on Dr. Levin's site:
http://mars.spherix.com/mars.html
There are many papers, and, as you probably know, he observed seasonal changes
in the color of some stones, (I actually have this picture on the wall at home),
those changes *could* be an indication of some life growing on those stones,
using energy from the sunlight.
That, together with his life detection experiment that was positive, makes
a strong case for some form of life on mars.

Posted by rick++ on October 14, 2007, 12:45 pm
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> I have always been disappointed with the BW pictures send back by NASA.
> ESA got it right first time, with beautiful color images, 3D too,
> and TRUE color images on top of that.

My disappointment with ESA is they takes months to years to release
data.
NASA puts theirs on the web within 48 hours.
Now if they only implemtent the best of each others policies ....


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