Exquisite Saturn Images |
Exquisite Saturn Images |
Feb 3 2007, 07:35 PM
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#76
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Merciless Robot Group: Admin Posts: 8789 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Ian, these are just stunning, really...incredible. It's the next best thing to being there, which probably none of us will ever get to do, so thank you very much!
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Feb 4 2007, 08:50 PM
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#77
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 4 2007, 09:27 PM
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#78
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Ian, these are just stunning, really...incredible. It's the next best thing to being there, which probably none of us will ever get to do, so thank you very much! Thanks nprev - I'm really flattered by your very kind words! I'm having a great deal of fun with the Cassini imagery at the moment, as you can no doubt see. Ever since I first discovered this website, I have wondered and marvelled at the fantastic work done by the other members here - it's amazing to see so much talent in a single forum. It's very rewarding for me to finally be able to give a little bit back to the community that has provided me with so many truly great images over the past 18 months or so. -------------------- |
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Feb 5 2007, 01:34 AM
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#79
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Here's a short GIF animation showing Cassini approaching the ring plane from below. Note how several atmospheric features can be seen moving from West to East during the sequence:
Zooming in on the northern hemisphere: Ian. -------------------- |
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Feb 5 2007, 02:08 AM
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#80
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 5 2007, 02:23 AM
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#81
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
More amazing stuff , thanks a lot Ian.
James -------------------- |
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Feb 5 2007, 02:36 AM
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#82
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 5 2007, 02:55 AM
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#83
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 5 2007, 04:01 AM
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#84
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
Ian this is great work. For some reason people have been somewhat shy of processing the Saturn images. I am glad you have stepped up to the plate and really taken on this task. Keep up the good work.
EDIT: My wife who isn't all that interested in my UMSF hobby, just glanced over my shoulder and declared "Oh, now that's nice." -------------------- If Occam had heard my theory, things would be very different now.
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Feb 5 2007, 11:36 AM
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#85
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Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
This is some fine work you're putting out Ian! The only comment I have is the output is a bit too blue-tinted. My goofing around with VIMS spectrometer data (check out the lower Saturn pic here, it's a similar viewpoint) to get more accurate colors basically suggests a "true color" appearance very similar to this CICLOPS view, though the saturation in that image might be a bit too high.
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Feb 5 2007, 07:40 PM
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#86
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 5 2007, 07:59 PM
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#87
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
This is some fine work you're putting out Ian! The only comment I have is the output is a bit too blue-tinted. My goofing around with VIMS spectrometer data (check out the lower Saturn pic here, it's a similar viewpoint) to get more accurate colors basically suggests a "true color" appearance very similar to this CICLOPS view, though the saturation in that image might be a bit too high. I do plan to go back and adjust the colour balance of these images at some point, so thanks for the pointer Gordon. Unfortunately, the stretching that is applied to these raw JPEGs means that two views that should have identical contrast, hue and saturation, end up all over the place. What do you suggest is the best way to correct the colour in these images? Should I manually adjust the brightness and contrast of the B&W raws, or should I simply change the Red/Green/Blue values of the resultant composite? Cheers, Ian. -------------------- |
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Feb 5 2007, 09:00 PM
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#88
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Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
When I do raw processing, I composite each footprint individually (aligning the 3 channels basically) and then paste them all into one image in Photoshop as different layers. Then comes the adjusting each footprint's color channel to match all others. Once they all match up (more or less), you can flatten the image and do brigthening/dimming of each channel to approximate the calibrated output. A calibrated output will have Saturn a dullish-yellow color, not fancy colors. You can then mix the three channels sensibly to produce a satisfactory result. Mixing will wash out saturation, but you can always increase that up later. Admittedly, it's a lot of work to work with raws and I personally kind of lost the interest to do it twice, first with raws and then do it the "proper" way once the data hits PDS.
BTW, that latest image is great! It's so Voyager-esque. In fact, you can use that moon that's visible to correct the colors a bit, make it turn white and you'll have colors closer to calibrated ones. Usually you can't rely on stuff like that, though. Did you use the violet or blue filter, this looks to me like it's violet? Cassini spent so much time on the night side that I lost track of just how south ring shadows have actually moved. I took the liberty of tweaking your image a bit, I hope you don't mind: It's just way cool -------------------- |
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Feb 5 2007, 09:37 PM
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#89
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
I taken some liberty too; still not perfectly matched with Gordan reccomandation, but a little more realistic.
Thanks again, Ian. -------------------- I always think before posting! - Marco -
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Feb 6 2007, 03:38 AM
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#90
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Interplanetary Dumpster Diver Group: Admin Posts: 4405 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Wow, great stuff!
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