On Thu, 07 Dec 2006 15:45:43 GMT, "Pieter Litchfield"
wrote:

As a (B&W) photographer, I am very sensitive to the subtle changes that
changes in camera position, changes in light intensity and position, and
changes in exposure can have on a picture. In looking very carefully at
many of the MSNBC slide show shots "showing" the beds of purported recent
water flows on Mars I can see those same, or very similar tracks on the
"before" pictures. Certainly the "after" pictures could have been
positioned, timed, and exposed to reveal or enhance details that were in the
shadows in the "before" pictures.

Look at them very carefully. I think there may be less here than meets the
eye.

As somebody who has worked at JPL's imaging lab, albeit when techniques
were much less sophisticated (I was there when Viking data was being
processed), I can assure you that each and every one of these images was
studied with the solar angle being accounted for. There is no doubt that
the images depict actual changes in morphology; some may posit causes
other than flowing water, but nobody seriously suggests that the images
are just the product of different lighting conditions.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com