Exploring Gediz Vallis and its ridge, Sols 3871-xxxx, 1 Jul 2023- |
Exploring Gediz Vallis and its ridge, Sols 3871-xxxx, 1 Jul 2023- |
Jun 1 2024, 12:43 PM
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#556
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Senior Member Group: Members Posts: 2837 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353 |
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Jun 1 2024, 04:59 PM
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#557
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Senior Member Group: Members Posts: 1643 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Animation between Sols 4193 and 4197 using official mosaics. Charting a new course to the west and moving further into the channel.
Longer steppable drive animation with a combination of official and Jan's mosaics from Sol 3435 up to the present. -------------------- Steve [ my home page and planetary maps page ]
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Jun 3 2024, 12:42 AM
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#558
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Senior Member Group: Members Posts: 4251 Joined: 17-January 05 Member No.: 152 |
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Jun 3 2024, 01:33 AM
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#559
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Member Group: Members Posts: 913 Joined: 4-September 06 From: Boston Member No.: 1102 |
Did a wheel go over this? Any one want to speculate as to what mineral would have this appearance?
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Jun 3 2024, 02:00 AM
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#560
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Senior Member Group: Members Posts: 4251 Joined: 17-January 05 Member No.: 152 |
Yes, they drove over it and cracked it open. You can see it on the left of this navcam frame:
https://mars.nasa.gov/msl-raw-images/proj/m...NCAM00200M_.JPG |
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Jun 3 2024, 07:13 PM
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#561
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Member Group: Members Posts: 813 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
The accuracy of the colours here isn't very certain, but I don't recall anything showing up this vivid a shade of green with these cameras before: I think part of the green tint is due to debayering artifacts. Here is what I obtain after removing them. Here is also the MC100 context mosaic of the workspace. -------------------- |
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Jun 3 2024, 08:30 PM
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#562
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Senior Member Group: Members Posts: 4251 Joined: 17-January 05 Member No.: 152 |
I think part of the green tint is due to debayering artifacts. Here is what I obtain after removing them. It's common to see green blocks when doing a simple deBayering. But they appear on smooth areas, where the jpeg compression algorithm is tricked into compressing too much. I don't recall green artifacts on irregular areas before. Also the green deBayering artifacts follow the 8x8 pixel DCT jpeg block pattern, which these greenish areas don't. How do you remove the green blocks - is it possible you've removed too much green? The overall colour balance may be off somewhat in my image. And there certainly might be something about the rock here that causes some new type of artifact - we may have to wait to see colour images from the original data to know for sure. |
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Jun 3 2024, 09:56 PM
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#563
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Senior Member Group: Members Posts: 1045 Joined: 17-February 09 Member No.: 4605 |
Being Mars, the automatic reaction is that it's calcium sulphate.
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Yesterday, 10:37 AM
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#564
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Member Group: Members Posts: 892 Joined: 9-September 17 From: UK Member No.: 8241 |
Gigapan - MSL 4202 MR © NASA/JPL-Caltech/MSSS/NeV-T -------------------------------------- GigaMacro - MSL 4202 MR © NASA/JPL-Caltech/MSSS/ASU/NeV-T -------------------- |
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Yesterday, 05:28 PM
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#565
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Member Group: Members Posts: 913 Joined: 4-September 06 From: Boston Member No.: 1102 |
re fredk and serpens
Gypsum can be green if it contains a little copper. -------------------- |
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Yesterday, 06:05 PM
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#566
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Member Group: Members Posts: 892 Joined: 9-September 17 From: UK Member No.: 8241 |
It's common to see green blocks when doing a simple deBayering. But they appear on smooth areas, where the jpeg compression algorithm is tricked into compressing too much. I don't recall green artifacts on irregular areas before. Also the green deBayering artifacts follow the 8x8 pixel DCT jpeg block pattern, which these greenish areas don't. How do you remove the green blocks - is it possible you've removed too much green? The overall colour balance may be off somewhat in my image. And there certainly might be something about the rock here that causes some new type of artifact - we may have to wait to see colour images from the original data to know for sure. Try using HLVG been using it for years - pretty good https://www.deepskycolors.com/tools-tutorials/hlvg/ -------------------- |
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Yesterday, 08:47 PM
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#567
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Member Group: Members Posts: 813 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
It's common to see green blocks when doing a simple deBayering. But they appear on smooth areas, where the jpeg compression algorithm is tricked into compressing too much. I don't recall green artifacts on irregular areas before. Also the green deBayering artifacts follow the 8x8 pixel DCT jpeg block pattern, which these greenish areas don't. How do you remove the green blocks - is it possible you've removed too much green? The overall colour balance may be off somewhat in my image. And there certainly might be something about the rock here that causes some new type of artifact - we may have to wait to see colour images from the original data to know for sure. I use "Replace color" tool on Photoshop, selecting greenish areas and decreasing their hue of -10. It's possible I've removed too much green. But I suspect the color of these bright crystals being affected by some sort of green artifacts. The correction made by Neville is really good at removing greenish blocks. Let's see what the color calibrated data look like when it'll be released. -------------------- |
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Yesterday, 11:42 PM
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#568
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Senior Member Group: Members Posts: 4251 Joined: 17-January 05 Member No.: 152 |
Yeah, the regular 8x8 green blocks are easy to deal with, and there are some in smooth areas of this image that my algorithm removes, but some areas not on the 8x8 grid remain.
The thumbnail is available here: https://mars.nasa.gov/msl-raw-images/msss/0...870I01_DXXX.jpg and presumably comes from the original raw data. Here it is scaled up 400%, but with no other processing: I think the resolution is too low too say for sure. The image has an overall greenish cast which should go away with calibration so the bright areas may still be close to white. |
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