posted on Feb, 7 2004 @ 02:19 AM
Hrm, lot of points
emokid: as others have pointed out you are confusing the ESA Mars Express orbiter pics with the NASA rovers, didn't you notice the ESA ones were from
a slightly more elevated angle than the Rover ones?
mulder: as triplesod hamilton and a few others have pointed out, the Pancam images come back as black and white plates of each color channel. Each
rover has 10 cameras on board.
More info about pancam images here:
Whoever created this page: mindspring.com...
Is utterly wrong in his assumptions (for reasons we have covered before) all he is showing is what the image would look like if all plates were
amplified to maximum exposure. The rovers onboard computer does this to increase the Signal-to-Noise for the transmission back to Earth. This has to
be undone before any meaningful images can be created.
As far as the sundial/ground shots not looking exactly the same as the ones released. We have to remember that the automatic exposure levels are
equivalent to equalizing the color channels. In this case its pushing the brightest ring of the sundial into white. This method is the best way we
have at present to get an approximation of the actual colors, until the full mission data kit is released post-mission.
The obvious problem with it is that any tint to the overall scene is lost. The best example of this it the one showing the airbags and sundial with a
little ground behind. It is clearly a late afternoon shot, yet the equalized channels make it appear as brightly lit as an Earth midday.
The one curious point, also pointed out by Archangel, is that there has been a 6 day delay in posting the Spirit sol26 images. Perhaps due to the
just-finished recovery operations on Spirit. But we eagerly await their publishing.
[Edited on 7-2-2004 by Kano]