[X] My Assistant

[Nix]

This is something I've had in mind for a long time and I uploaded the first part of it just now.

The way lighting conditions change on Mars got me thinking about a way to visualize it through some horizon-row pans, as most of the difference is in the sky/near the horizon.
While these are not scientifically perfect works regarding true color, the way Mars appears on different times should be apparent from these pans in the color and false-color pans.


Awalkonmars Home

Comments and further ideas appreciated!

Nico

[Guest_Richard Trigaux_*]

For me, "calibrated colours" mean an as realistic as possible colour rendering (accounting witht he filters used) so that we take three images, of three filters, and get a three channels color view, not a colorized greyscale view. For instance, if you look at the well known pano a Burns cliff, it looks realistic, but if you look at the color target (the thing with four color dots and a sun dial) it looks orange, telltale of an overal orange colorization of a greyscale image (which was even not shot with a visible light filter, as the target dots appear all of the same colour). So we don't really know yet what colour is Mars.
I remember on the yellow forum there was a discution with somebody saying that the marsian sky is blue. A somewhat surprising statement, but not completelly stupid: fine dust may look blue like smoke, with Raleight diffusion, exactly as the Earth sky. But how to know the truth, if all the martian images we see are just colorized greyscale? We could as well colorize them in green, and say that the martian sky is green.

[djellison]

if all the martian images we see are just colorized greyscale?

They're not.

You can get the data here -
http://anserver1.eprsl.wustl.edu/navigator...rover=B&sol=294

That panorama, and specifically those frames happened to be taken at a point when the sun was directly behind the dial, and thus reflecting off its surface

You can see that even in the raw imagery
http://marsrovers.jpl.nasa.gov/gallery/all...unity_p294.html

I've gone and made that 'column' of data, and straight out of my normal processing flow I get the first attachment, and the seconds attachment is that image, stretched to maximize dynamic range - and one gets a very similar result to that of the Athena release image.

Doug

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