MSL Images & Cameras, technical discussions of images, image processing and cameras |
MSL Images & Cameras, technical discussions of images, image processing and cameras |
Aug 16 2012, 11:05 PM
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
I'm still trying to figure out a number of things about the new images we are trying to work with. Assuming others are likewise trying to learn, I thought I would open this thread to create a place for such discussions.
I'd like to start out with a comment about raw image contrast. There have been several postings in the main threads about whether or not the MSL raw images have been stretched like those from the MER missions. I am certainly no expert on this, but it looks to me as if the MSL images have not been stretched at all. I haven't tried to analyze all of the image types, but the hazcams and navcams have pixel brightness histograms that are very different from their MER counterparts. This attached image compares MER and MSL navcams along with their luminosity histograms. The MSL images clearly are not using the entire, available range of brightness values, whereas the MER raws do. For this reason, the MSL raw images can usually be nicely enhanced by simply stretching the distribution of brightness across the full 256 value range. -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Sep 18 2012, 03:09 PM
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Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
Well yes, dark sand and over exposed rocks ?
http://mars.jpl.nasa.gov/msl-raw-images/pr...NCAM00427M_.JPG Sorry about that but I have to disagree. Try out to devignetting pictures like this, with so much difference between frames… Maybe it's clearer for people that are just consulting it, but working with that ? Okay, then I think I'm good to some nightMER panoramic adjustments. I hope that I'm not the only one to have this point of view… -------------------- |
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Sep 20 2012, 07:05 AM
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#3
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Member Group: Members Posts: 154 Joined: 19-September 12 Member No.: 6658 |
I hope that I'm not the only one to have this point of view… Definitely not! The "new" ones are really harder to work with and I guess we will see more navcam panoramas with not so good blending now. Working more than ten years in postproduction on images my opinion is that raw images should stay unaltered. Also the darker ones mentioned above represent better that it is Mars we are looking at and not Earth. |
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