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30th Anniversary of the Voyager 1 Flyby of Jupiter
volcanopele
post Mar 5 2009, 08:20 PM
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Today marks the 30th anniversary of Voyager 1's flyby of Jupiter. On March 5, 1979, Voyager 1 flew through the Jupiter system providing a wealth of information of Jupiter, its magnetic field, and moons. Thanks to Voyager 1, the Galilean satellites became worlds with real geology and amazing vistas. Voyager 1 also revealed Jupiter's ring system and Io's volcanism for the first time.

I've written up a longer post about the encounter with Io on my blog, which also has an animation of the flyby: http://gishbar.blogspot.com/2009/03/30th-a...1-flyby-of.html


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Bjorn Jonsson
post Jul 25 2010, 08:12 PM
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This is certainly extremely interesting. I tried recomputing the color balance of a Voyager 2 GRS mosaic I did back in 2001 ago but I now used calculations similar to those used above by Gordan and described in more detail in the VIMS thread. I think the color is significantly more realistic in the new version but beware that there might still be some bugs in my code so this might change slightly. Anyway, this is what it now looks like:

Attached Image


A smaller image showing the color in the old version of the mosaic:

Attached Image


The new version definitely looks more realistic in my opinion. It should be noted that I haven't done any gamma corrections.

By the way these are images of the Great Red Spot obtained by Voyager 2 on 6 July 1979 at a range of 3.8 million km. We are viewing the GRS from directly above in this mosaic so it shows the GRS' true shape better than the original images which were obtained with the spacecraft about 5 degrees north of the equatorial plane.
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ugordan
post Jul 29 2010, 01:13 PM
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QUOTE (Bjorn Jonsson @ Jul 25 2010, 10:12 PM) *
I think the color is significantly more realistic in the new version but beware that there might still be some bugs in my code so this might change slightly.

A quick sanity check on your code would be to check a known neutral case input. If you are working with I/F reflectance data (i.e. solar spectrum divided out), then putting in a completely flat (say unity) spectrum into the calculation and illuminating it with the D65 illuminant (which is the sRGB white point), you should get a completely neutral grey RGB color as output.

If you are working with radiance data instead, you will end up with a yellowish-orange color as that is what sunlight color appears in the D65 white point. The effect would be similar to setting a digital camera white balance to daylight/overcast and taking a picture or something under an incandescent lightbulb.


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Posts in this topic
- volcanopele   30th Anniversary of the Voyager 1 Flyby of Jupiter   Mar 5 2009, 08:20 PM
- - volcanopele   There was an earlier thread on this subject a coup...   Mar 5 2009, 10:14 PM
- - Ian R   Here's the official JPL visulization of the Vo...   Mar 6 2009, 12:13 PM
- - volcanopele   In commemoration of this 30th anniversary of the d...   Mar 8 2009, 10:29 AM
- - volcanopele   Of course, no sooner do I write "though I los...   Mar 8 2009, 10:43 AM
- - Astro0   That's astounding and outstanding! The vi...   Mar 8 2009, 10:53 AM
- - volcanopele   Thanks, astro0! I've gone ahead and poste...   Mar 9 2009, 12:00 AM
- - climber   Thanks Jason, it brings back old memories. I first...   Mar 9 2009, 02:04 AM
- - lyford   This is truly wonderful, thank you.   Mar 9 2009, 04:06 AM
- - volcanopele   Wow, this is fun for me too, digging through these...   Mar 9 2009, 04:59 AM
- - nprev   The mosaic is beautiful work, Jason; thank you...   Mar 9 2009, 05:09 AM
- - volcanopele   Wow, this actually only has a resolution of 2.02 k...   Mar 9 2009, 08:36 AM
- - Juramike   Beautiful work!   Mar 9 2009, 11:02 AM
- - Decepticon   QUOTE The first closeup Io images were just coming...   Mar 9 2009, 01:47 PM
|- - tedstryk   I have been meaning to take a crack at trying to r...   Mar 9 2009, 02:33 PM
|- - nprev   QUOTE (Decepticon @ Mar 9 2009, 05:47 AM)...   Mar 9 2009, 09:24 PM
- - dvandorn   I do own (I think, I haven't cataloged in a lo...   Mar 10 2009, 12:48 AM
|- - volcanopele   QUOTE (dvandorn @ Mar 9 2009, 05:48 PM) I...   Mar 10 2009, 08:37 AM
- - Decepticon   QUOTE two different VHS videotapes labeled "N...   Mar 10 2009, 12:59 AM
- - volcanopele   Okay, finished up with those three mosaics (two hi...   Mar 10 2009, 05:48 AM
- - mhoward   Wow. The detail along the terminator is mind-blowi...   Mar 10 2009, 06:39 AM
- - PhilCo126   PBS coverage of all Voyager milestones is still av...   Mar 10 2009, 10:15 AM
- - Ian R   Great work Jason - the mosaics are wonderful! ...   Mar 10 2009, 09:37 PM
- - volcanopele   Thanks, Ian. I knew I had seen that somewhere...I...   Mar 10 2009, 11:30 PM
- - Decepticon   One thing that stands out so much with these old v...   Mar 11 2009, 11:44 AM
- - belleraphon1   Stunning mosaic Jason... wow.... you know Io (an...   Mar 11 2009, 04:06 PM
|- - tedstryk   Am I correct in assuming the images that look like...   Mar 11 2009, 06:34 PM
- - Ken90000   I believe that radiation caused a glitch on Voyage...   Mar 13 2009, 12:09 AM
- - machi   High resolution mosaic from Voyager 1. Resolution ...   Nov 19 2009, 10:24 AM
|- - 4th rock from the sun   Nice! Its something new from Voyager, at least...   Nov 19 2009, 11:27 AM
|- - tedstryk   Great work! If I might suggest something, fla...   Nov 20 2009, 02:36 AM
|- - machi   QUOTE (tedstryk @ Nov 20 2009, 03:36 AM) ...   Nov 20 2009, 10:32 AM
|- - ugordan   QUOTE (machi @ Nov 20 2009, 11:32 AM) Tha...   Nov 20 2009, 11:29 AM
|- - machi   QUOTE (ugordan @ Nov 20 2009, 12:29 PM) T...   Nov 20 2009, 12:13 PM
|- - 4th rock from the sun   Tho have good results in image calibration, you sh...   Nov 20 2009, 02:29 PM
|- - tedstryk   I use different dark frames and flat fields for di...   Nov 20 2009, 03:50 PM
- - tasp   I really appreciate this thread as 30 years ago I ...   Nov 19 2009, 04:13 PM
- - elakdawalla   What do you use for a Voyager flat field, Ted?   Nov 20 2009, 03:03 AM
|- - DrShank   QUOTE (elakdawalla @ Nov 19 2009, 10:03 P...   Nov 20 2009, 03:34 AM
- - JohnVV   QUOTE I really appreciate this thread as 30 years ...   Nov 20 2009, 04:55 AM
- - machi   Io shadow on Jupiter (and interesting clouds). Res...   Nov 24 2009, 09:22 PM
- - machi   Callisto colorised mosaic. Mosaic is composed from...   Dec 7 2009, 10:49 AM
- - machi   Maasaw Patera from Voyager 1. Colorised from WAC i...   Dec 19 2009, 05:12 PM
|- - tedstryk   NICE!!!   Dec 19 2009, 05:22 PM
- - nprev   Damn straight! That's beautiful, Machi.   Dec 19 2009, 06:58 PM
- - machi   Thanks! Here is another mosaic from Voyager 1...   Dec 20 2009, 08:36 PM
- - DrShank   from the forthcoming "Atlas of the Galilean S...   Dec 20 2009, 11:15 PM
- - nprev   Slurp. Drool. Salivate.   Dec 21 2009, 12:57 AM
- - lyford   Images like that are why the acronym OMFG were inv...   Dec 21 2009, 03:17 AM
- - machi   Io's paterae at 360 m/pix from Voyager 1.   Jan 28 2010, 12:33 PM
- - machi   This is new version of mosaic from 20.12.2009 in t...   Jan 30 2010, 05:30 PM
- - Juramike   That's a nice desmearing process! Good im...   Jan 30 2010, 05:55 PM
|- - tedstryk   Nice!   Jan 30 2010, 06:42 PM
- - machi   Egypt Mons from Voyager 1. Mosaic from lower and ...   Feb 28 2010, 09:00 AM
- - stevesliva   Wow! That's got to be the most "norm...   Feb 28 2010, 03:06 PM
- - machi   I think that isn't such thing as "normal...   Mar 1 2010, 04:02 PM
- - machi   New Callisto ("Titan without weather" )...   Mar 19 2010, 05:33 PM
|- - tedstryk   Where is it?   Mar 19 2010, 05:42 PM
- - machi   I can't upload rar, thus I reduced filesize.   Mar 19 2010, 05:52 PM
|- - tedstryk   Excellent work!   Mar 20 2010, 01:20 AM
- - machi   Thanks! What a pity, that most images from V...   Mar 21 2010, 04:08 PM
- - tasp   I am thinking the color Voyager pictures must have...   Mar 21 2010, 05:40 PM
- - Ian R   That is just a beautiful example of image processi...   Mar 21 2010, 06:08 PM
- - machi   Thanks! Tasp: If my memory is right, so differ...   Mar 22 2010, 10:13 AM
- - ugordan   I've been experimenting with CIE XYZ colorspac...   Jul 24 2010, 06:48 PM
|- - Bjorn Jonsson   The cleaned up/color compensated version looks gre...   Jul 24 2010, 08:37 PM
|- - Bjorn Jonsson   Here are two files containing some information (in...   Jul 24 2010, 08:57 PM
|- - ugordan   Thanks for those files, Bjorn. I'll have to gi...   Jul 24 2010, 09:09 PM
- - Bjorn Jonsson   This is certainly extremely interesting. I tried r...   Jul 25 2010, 08:12 PM
|- - ugordan   QUOTE (Bjorn Jonsson @ Jul 25 2010, 10:12...   Jul 29 2010, 01:13 PM
|- - tedstryk   I processed a Voyager 1 crescent image of Callisto...   Dec 8 2011, 02:01 AM
- - Ian R   As so often happens, Bjorn and Gordan, your work h...   Jul 26 2010, 08:35 AM
- - Ian R   Here's another view from Voyager 2, taken on M...   Jul 26 2010, 11:52 AM
- - Ian R   Now, this certainly would be a mammoth undertaking...   Jul 26 2010, 12:03 PM
- - Stu   *****y hell...!!! That's l...   Jul 26 2010, 02:26 PM
- - ElkGroveDan   Ah nostalgia. as I watch this I can almost smell ...   Jul 26 2010, 04:09 PM
- - machi   Ian, Bjorn, Ugordan: Very nice images! Very pr...   Jul 26 2010, 06:48 PM
- - Ian R   Here's another Voyager 2 narrow angle view, ta...   Jul 27 2010, 09:58 AM
|- - 4th rock from the sun   Beautifully results! The only improvement I ca...   Jul 28 2010, 01:16 PM
|- - ugordan   My hunch is you'd need reprojection software (...   Jul 28 2010, 06:01 PM
- - Roby72   As for realistic planetary movies without flickeri...   Jul 27 2010, 10:26 PM
- - machi   Nice! Is it from WAC or NAC? " It is am...   Dec 8 2011, 11:19 AM
- - tedstryk   QUOTE (machi @ Dec 8 2011, 12:19 PM) Nice...   Dec 8 2011, 11:36 AM


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