posted on Dec, 11 2008 @ 08:59 AM
Originally posted by Montana
reply to post by RFBurns
The thing about your reference to the white balance, if I understand what you are saying that is, I don't think it would be accurate. You are saying
you compare the white of the rover arm in the photos taken by the cameras on the rover with photos taken of the arm before launch. The problem that
comes to my mind (a terrifying place to look at by the way,,,) is that the arm has been as covered by dust and discolored by UV and aging.
I don't feel you would get a true reference color in that way anymore.
But, hey! I could be wrong!
Yes that is true. The rover and probes do get dust on them, as seen in the photo Deaf Alien posted. But if you look very closely at his picture, you
can still see some white in the white ring around the sundial. This is enough to get a close whte balance by simply adjusting so that the ring is as
white as you can make it. Then once that is done, you can then further analyze the color chart reference tabs and see if they turn out a red, green
and blue color, which if you look at my white balanced adjusted image of Deaf Alien's picture, that is what we get.
And the wind doesnt always blow or blow enough to kick up dust onto the rovers. And when the rovers do get dust on them, wind comes along again and
blows all that dust off. Spirit's solar pannels once got saturated with the dust, so much that it jepordized the extended mission because the
batteries were not getting enough charge from the soler panels. But a couple of days later, using the panoramic camrea, NASA noticed and verified thru
telemetry data, that the rover was getting power again and the panoramic camera showed that the solar pannels were cleared of dust.
So yes in some photos where there is a huge amount of dust, you may not get a proper white balance. But that is true with cameras and images and video
here on Earth, when you try to take a picture outside in a dust storm. The resulting image will be brownish from the dust and dirt all over the