Finishing work in and around Seitah, sols 238-378 Options

[Phil Stooke]

It's time to start a new thread - this will cover the remaining work in Seitah and the drive back to the landing site.

Phil

[tau]

... One thing I notice in your processing of these photos in this area is that their top "airfall coating" is very light, almost white in IR. It'll be interesting to look at that chemistry. ...

The "top airfall coating" is most likely orange-brown dust, and it appears featureless white or very bright in my images due to clipped highlights in the Mastcam-Z raw images that I used.
This clipping exists in all Mastcam-Z gray-scale raw images of filters 1 to 6 and in the red channel of filter 0 (RGB), where the clipped areas have the value 254.
The "raw images" are obviously not raw in the sense of digital photography, where "raw" means straight out of the camera and not jpeg-ed.
Because calibrated images from sol 364 are not yet available, here is an example from Sol 69 with the upper part of Kodiak hill:

1. Mastcam-Z right eye filter 1 (infrared) image from NASA's "Raw Images" site (link), with 8 bit per pixel, no details visible in the brightest part
2. Same as 1, all pixels with a value 254 are marked red
3. Calibrated image from the Planetary Data System Imaging Node with 16 bit per pixel, (link)
4. Same as 3, brightness adjusted
5. Same as 3, histogram adjusted to show the details in the brightest part on top of Kodiak hill

[Bill Harris]

The "top airfall coating" is most likely orange-brown dust, and it appears featureless white or very bright in my images due to clipped highlights in the Mastcam-Z raw images that I used.

snip

That makes sense. You're trying to show the maximum range down to shadowed areas, and some other areas need to fall by the wayside.

--Bill