From: Alan Friedman <alan@greatarrow.com>

Date: January 10, 2008 12:33:44 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] PGR vs TIS CCDs on Mars


The resolution seems similar between the two images, limited by the seeing I would guess, But the monochrome camera image shows the better signal available with the more sensitive chip set. Not sure if more would come from further processing on this image - the color camera image is at the limit.


The white stuff is atmospheric detail very nicely captured. It is missing from the color camera image - perhaps due to lack of sensitivity in the blue where this detail is seen?


best,

Alan



On Jan 10, 2008, at 12:19 PM, Perry Holcomb wrote:

Very nice photos! However...

Sorry, but I think the TIS result is better. It looks
less "fuzzier" on the whole.

What's the "white" stuff definitely within the
curvature of the rim from 6 to 9 o'clock in the PGR
cam photo??

It's missing in the TIS cam image. There is a "blue"
arc from about 12 to 4 o'clock in that image, but it
almost appears beyond the rim. It's not in the PGR
cam one.

The TIS cam also seems to have better definition on
the right half of the photo.

I'm not sure what sort of processing these went thru,
either, but I would guess the RGB had to be combined
while the color photo from the DFK (doesn't it have an
IR cutoff filter in place, while the DBK series has no
filter?) didn't have to go thru that. Could that have
made a difference??

I'm a newbie here, but what I sees is what I sees!

Still very nice astroimaging, and I appreciate your
sharing both results with us, Jim!

Perry

.