Rev 123 - Dec 18, 2009-Jan 3, 2010 - Prometheus |
Unmanned Spaceflight.com > Outer Solar System > Saturn > Cassini Huygens > Cassini's ongoing mission and raw imagesRev 123 - Dec 18, 2009-Jan 3, 2010 - Prometheus |
 Dec 21 2009, 05:20 PM
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 The Poet Dude  Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60  |
I was struck by how much images like this...
http://saturn.jpl.nasa.gov/multimedia/imag...5/N00148493.jpg ... remind me of the view through my 4.5" scope when I peer into it without the eyepiece. LOts of fascinating internal light reflections there... -------------------- |
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Dec 28 2009, 03:52 PM
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 Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I cheat to get color. RGB color combos from Cassini images almost always have some completely white pixels due to the automatic stretching. To set the color I just go grab something Gordan made from calibrated imagery and set the RGB values of that brightest pixel to those of a bright pixel in a Gordan image. It's not science but then images made from raws aren't science either.
Also for the version I posted in the blog I made an RGB combo from red, green, and blue filter images, and also stacked the red, IR, clear, and green channel images to make one that was less affected by JPEG artifacts and noise, then did a nonlinear stretch on it to bring out some more of the detail in the brighter regions, then sharpened it just a little bit. Then I converted the RGB to HSB and swapped in the sharpened image for the clear channel. -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Dec 28 2009, 04:01 PM
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#3
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 Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
Which is kind of similar to what I did above - selected a small rectangle (for better s/n) in the thick of F ring, removed "dust and scratches" and averaged it and thus got the white point and channel balance, seeing how much each channel needs to be boosted to make that averaged portion gray. In 16 bit mode, of course, every little bit helps. Then just applying those factors to the entire composite. Obviously only works if you have something you know is pretty much white/gray in the source image AND is not overexposed in any channel - F ring, Mimas, Enceladus and leading hemispheres of Tethys and Dione work well here.
When it comes to raw jpegs, we all cheat. Only our methods may differ 
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Stu Rev 123 - Dec 18, 2009-Jan 3, 2010 - Prometheus Dec 21 2009, 05:20 PM
ugordan QUOTE (Stu @ Dec 21 2009, 06:20 PM) LOts ... Dec 21 2009, 05:22 PM peter59 Prometheus at last seen at close range.
and
Dec 27 2009, 03:32 PM Big_Gazza Raw close-up pics now (finally) available of Prome... Dec 27 2009, 03:42 PM Bjorn Jonsson Now that Cassini is no longer orbiting in the ring... Dec 27 2009, 03:52 PM
tedstryk Check out Enceladus!
http://saturn.jpl.nasa.go... Dec 27 2009, 03:56 PM volcanopele ROFLMAO, thank you for also posting the WAC view. ... Dec 27 2009, 04:12 PM ugordan Awesome Prometheus images, a quick RGB composite f... Dec 27 2009, 06:08 PM S_Walker [quote name='ugordan' date='Dec 27 200... Dec 28 2009, 03:10 PM ugordan QUOTE (S_Walker @ Dec 28 2009, 04:10 PM) ... Dec 28 2009, 03:25 PM S_Walker QUOTE (ugordan @ Dec 28 2009, 10:25 AM) D... Dec 28 2009, 03:40 PM volcanopele I'm still trying to deal with all these noise ... Dec 27 2009, 06:18 PM The Singing Badger Man, that is one ugly space rock. It looks like so... Dec 27 2009, 11:30 PM ugordan It's not ugly. It's got character. Dec 27 2009, 11:33 PM nprev It's also apparently got a lot of ring materia... Dec 27 2009, 11:55 PM ugordan And, not surprisingly, its craters appear to be mo... Dec 28 2009, 12:05 AM nprev You know, that's an interesting point. I wonde... Dec 28 2009, 12:14 AM tasp Perhaps we have an ongoing process of gradual depo... Dec 28 2009, 02:36 AM Hungry4info The image is terribly noisy, but you can see the s... Dec 28 2009, 02:16 PM S_Walker QUOTE (ugordan @ Dec 28 2009, 11:01 AM) W... Dec 28 2009, 04:09 PM S_Walker Thanks for the insights. This is probably closer t... Dec 28 2009, 04:00 PM jasedm Very interesting first images from a reasonable ra... Dec 28 2009, 08:04 PM JohnVV QUOTE Why would anyone foul a picture like that up... Dec 29 2009, 09:54 PM Astro0 One of UMSF's alumni makes a contribution in t... Dec 29 2009, 10:13 PM nprev Right on...congrats, Emily!!! Dec 30 2009, 12:57 AM tedstryk Awesome! Dec 30 2009, 05:13 AM Phil Stooke I hate being on vacation - I can't play with a... Dec 31 2009, 11:00 AM Ian R A crescent Saturn, taken on the 2nd of January:
... Jan 3 2010, 11:40 PM Elias QUOTE I'm still trying to deal with all these ... Jan 4 2010, 10:39 PM Phil Stooke I didn't notice anyone else commenting on this... Jan 4 2010, 11:35 PM Juramike I just love abstract images like this....
I won... Jan 5 2010, 03:35 AM pat and we get a repeat performance on Jan 27th, the p... Jan 8 2010, 04:05 PM elakdawalla Sweet! Aren't there a passel of other moo... Jan 8 2010, 05:09 PM jasedm Going by information elsewhere on the forum, Cassi... Jan 9 2010, 01:25 PM ugordan QUOTE (jasedm @ Jan 9 2010, 02:25 PM) Pan... Jan 9 2010, 03:01 PM pat QUOTE (jasedm @ Jan 9 2010, 01:25 PM) Goi... Jan 13 2010, 06:48 PM volcanopele QUOTE (pat @ Jan 13 2010, 11:48 AM) The m... Jan 13 2010, 08:04 PM Antdoghalo Anyone wanna improve the Voyager map Phil made wit... Jan 10 2010, 08:42 PM Floyd Antdoghalo--Improving on Phil's maps is not a ... Jan 11 2010, 01:45 AM Phil Stooke Well, thanks! But the biggest obstacle is the... Jan 11 2010, 01:52 AM jasedm Oooh! Lots of goodies coming up!! Than... Jan 13 2010, 10:06 PM ugordan Wow:
http://saturn.jpl.nasa.gov/photos/raw/rawi..... Jan 28 2010, 01:11 PM Phil Stooke Here's a hint of what's hiding in the shad... Jan 28 2010, 02:50 PM ElkGroveDan QUOTE (Phil Stooke @ Jan 28 2010, 06:50 A... Jan 28 2010, 02:58 PM rlorenz QUOTE (ElkGroveDan @ Jan 28 2010, 09:58 A... Jan 20 2011, 03:09 PM Phil Stooke A cleaned-up view of the end facing the F ring. T... Jan 28 2010, 04:41 PM CAP-Team Looks like a ringshadow!
Jan 28 2010, 08:08 PM dilo Color composition from images N00150201/202/203 (r... Jan 28 2010, 08:55 PM Ian R Here's an animation consisting of six NAC fram... Jan 28 2010, 08:32 PM Stu QUOTE (Ian R @ Jan 28 2010, 08:32 PM) Som... Jan 28 2010, 08:38 PM elakdawalla That's not Prometheus, that's a beating he... Jan 28 2010, 08:48 PM helvick I need a new word, Awesome just doesn't cut it... Jan 28 2010, 09:00 PM volcanopele QUOTE (helvick @ Jan 28 2010, 02:00 PM) I... Jan 28 2010, 09:25 PM elakdawalla Tremendous. And yes ring shadows have been seen o... Jan 28 2010, 09:26 PM Ian R Epimetheus as seen by Voyager 1:
http://en.wikipe... Jan 28 2010, 09:30 PM Patteroast Yay! Glad to be getting really good views of P... Jan 29 2010, 05:25 AM dilo An "extended color" composition from N00... Jan 30 2010, 03:02 PM Ian R http://photojournal.jpl.nasa.gov/catalog/PIA12593
... Mar 20 2010, 11:36 PM machi Prometheus flyby animation.
Timewarp 200×. Jan 16 2011, 10:25 PM machi Another animation of the "space potato" ... Jan 19 2011, 07:17 PM lyford Machi
Those are awesome, thank you! I feel l... Jan 19 2011, 08:51 PM ups That's no moon. Jan 20 2011, 10:12 PM |
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