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Galileo Imagery, I couldn't find a topic not specific to one moon....
tedstryk
post Dec 9 2007, 07:50 PM
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Here is a combination of all of Galileo's global color views of the Galileans. I have left out the large Europa mosaic because much of its color data is pulled from other orbits. I have also left out colorized views. Due to inconsistent filter selection, there some variation between images. I posted the Europa set in another thread, but I figured I would add the views of Ganymede and Callisto.

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Bjorn Jonsson
post Apr 24 2009, 12:25 AM
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Having seen what Cassini has done at Saturn I'm becoming surprised there aren't any really nice Jupitershine images of the Galileans (especially Io's Jupiter facing hemisphere). This shouldn't have been very difficult since Jupiter is much brighter than Saturn. Of course the downlink was severely limited but despite this I'm a bit surprised.
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stevesliva
post Apr 24 2009, 02:12 PM
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QUOTE (Bjorn Jonsson @ Apr 23 2009, 08:25 PM) *
Having seen what Cassini has done at Saturn I'm becoming surprised there aren't any really nice Jupitershine images of the Galileans (especially Io's Jupiter facing hemisphere). This shouldn't have been very difficult since Jupiter is much brighter than Saturn. Of course the downlink was severely limited but despite this I'm a bit surprised.


Given the bandwidth limitations where they probably couldn't return every sunlit Io image they had, would Galileo have been focused on IR images of the volcanically active areas when Io was in eclipse and nearby? I'd think bandwidth coupled with Io looking interesting in non-visible wavelengths would but the nails in the coffin of visible Jupitershine images.
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DrShank
post Apr 24 2009, 10:37 PM
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QUOTE (stevesliva @ Apr 24 2009, 09:12 AM) *
Given the bandwidth limitations where they probably couldn't return every sunlit Io image they had, would Galileo have been focused on IR images of the volcanically active areas when Io was in eclipse and nearby? I'd think bandwidth coupled with Io looking interesting in non-visible wavelengths would but the nails in the coffin of visible Jupitershine images.


it would have been nice indeed. several things made it unlikely. The ccd on galileo was 8-bit, on cassini it is 16-bit (or is it 12, i can never remember). In any case, the cassini ccd has a significantly broader dynamic range and can capture low light images. even so, if the exposure isnt long enough even for cassini, compression artifacting begins to kick in. ive used quite a few of these and have seen a wide range of quality. given the lower sensitivity, and the severe restrictions on downlink and tape recorder, either you expose for the lit side or the dark side. galileo could usually do only one or the other, not both because it was not a high priority to take the same image twice. they were lucky to get 150 images of ALL targets during any given orbit. so nite side imaging took it in the teeth.


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ugordan
post Apr 25 2009, 12:40 PM
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Yes, Cassini has 12 bit A/D converters and although it typically encodes images using an 8 bit lookup table, it's still able to capture the greater dynamic range 12 bit images produce, albeit with only 256 discrete levels.

I don't think Galileo having an 8 bit dynamic range to begin with gives you much to work with if the exposures are set for sunlit surfaces. Maybe some detail could be pulled out from higher phase sunlit surfaces since those inherently use longer exposures for rocky surfaces, otherwise the brightness difference is too great.


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Posts in this topic
- tedstryk   Galileo Imagery   Dec 9 2007, 07:50 PM
- - ElkGroveDan   Galileo imagery? APOD August 30 1996 Great wor...   Dec 9 2007, 08:47 PM
- - nprev   ...wow, Ted! Thank you; that's an incredib...   Dec 9 2007, 09:59 PM
|- - ugordan   QUOTE (nprev @ Dec 9 2007, 10:59 PM) Watc...   Dec 9 2007, 10:22 PM
|- - tedstryk   Actually, I didn't forget....There are so many...   Dec 9 2007, 10:27 PM
|- - tedstryk   This one is actually from Voyager, showing Europa...   Dec 19 2007, 09:03 PM
- - Tom Tamlyn   This seems like the right place to mention that Em...   Dec 19 2007, 10:07 PM
- - nprev   Congrats, Ted; Emily's made you an internation...   Dec 20 2007, 05:22 AM
- - elakdawalla   TTT -- I probably shouldn't refer to my image ...   Dec 20 2007, 03:17 PM
|- - tedstryk   That is a really cool feature. By the way Emily, ...   Dec 20 2007, 04:27 PM
|- - tedstryk   I have re-reworked the closer I32 global view, and...   Apr 14 2009, 01:38 PM
- - PhilCo126   Here's a special image of the Jovian moons: ht...   Apr 23 2009, 08:00 AM
|- - DrShank   nice! but Galileo image compression almost alw...   Apr 23 2009, 07:10 PM
- - Bjorn Jonsson   Having seen what Cassini has done at Saturn I...   Apr 24 2009, 12:25 AM
|- - stevesliva   QUOTE (Bjorn Jonsson @ Apr 23 2009, 08:25...   Apr 24 2009, 02:12 PM
|- - DrShank   QUOTE (stevesliva @ Apr 24 2009, 09:12 AM...   Apr 24 2009, 10:37 PM
|- - ugordan   Yes, Cassini has 12 bit A/D converters and althoug...   Apr 25 2009, 12:40 PM
- - Sunspot   It's a shame its going to be at least 30 odd y...   Apr 24 2009, 10:09 PM
|- - tedstryk   QUOTE (Sunspot @ Apr 24 2009, 10:09 PM) I...   Apr 27 2009, 11:53 PM
|- - tedstryk   Here is another nice view from Galileo, taken duri...   May 1 2009, 06:24 PM
|- - DrShank   QUOTE (tedstryk @ May 1 2009, 01:24 PM) H...   May 2 2009, 04:09 AM
- - Phil Stooke   I expect the other things visible in sunlight were...   Apr 24 2009, 10:15 PM
- - Bjorn Jonsson   This is true and even long exposures might have be...   Apr 25 2009, 01:42 PM
- - Phil Stooke   Cassini at Iapetus was moving very slowly, but Gal...   Apr 25 2009, 04:31 PM
|- - ugordan   True, but Io also receives much more jupitershine ...   Apr 25 2009, 04:39 PM
|- - tedstryk   In these images, compression was not the worst pro...   Apr 25 2009, 08:12 PM
|- - john_s   Actually there are a few low-resolution, global, G...   Apr 27 2009, 10:23 PM
- - machi   Beautiful images! Io is really very photogenic...   Nov 9 2009, 06:06 PM
- - machi   Asteroid Ida in false color.   Dec 1 2009, 11:26 AM
- - djellison   False colour? really? I've stretched the sat...   Dec 1 2009, 11:34 AM
|- - machi   QUOTE (djellison @ Dec 1 2009, 12:34 PM) ...   Dec 1 2009, 11:40 AM
- - Phil Stooke   Since the original mosaic was monochrome, any colo...   Dec 1 2009, 01:28 PM
- - paxdan   I believe machi is using false colour to mean arti...   Dec 1 2009, 01:55 PM
|- - machi   Full inline quote removed - ADMIN Right. This is ...   Dec 1 2009, 02:33 PM
- - djellison   A more appropriate phrase would have been 'col...   Dec 1 2009, 03:20 PM
- - jekbradbury   As Jason Perry pointed out a couple months back ov...   Dec 25 2009, 08:54 PM
|- - tedstryk   Impressive! By the way, I don't think I...   Dec 26 2009, 04:12 AM
|- - tedstryk   I posted a short Europa-related blog entry yesterd...   Dec 28 2009, 06:59 PM
|- - ugordan   Here are two rough color views from Galileo. Valh...   Jan 7 2010, 11:53 AM
- - volcanopele   What a difference rotating an image can make: F...   Jan 21 2010, 10:59 AM
- - machi   Amazing! I'm not geologist, but I have see...   Jan 21 2010, 01:06 PM
|- - DrShank   or a slightly different take, simulating the view ...   Jan 21 2010, 02:53 PM
|- - DrShank   QUOTE (DrShank @ Jan 21 2010, 08:53 AM) a...   Jan 22 2010, 01:10 PM
- - Explorer1   On a related note, look at what made it onto Wikip...   Mar 2 2010, 03:28 AM
- - volcanopele   I had this on my blog a few days ago, but I've...   Mar 11 2010, 10:39 PM
|- - stevesliva   QUOTE (volcanopele @ Mar 11 2010, 06:39 P...   Mar 12 2010, 04:29 AM
- - nprev   Those are just mind-blowing, Jason. I never knew...   Mar 12 2010, 04:33 AM
|- - ugordan   Shamelessly stealing volcanopele's 10ISIOGLOC0...   Jul 26 2010, 09:15 PM
- - Decepticon   Oh wow Gold!   Jul 27 2010, 12:29 AM
- - JohnVV   I thought that this one was the correct color and ...   Jul 27 2010, 05:01 AM
|- - volcanopele   QUOTE (JohnVV @ Jul 26 2010, 10:01 PM) I ...   Jul 27 2010, 06:22 AM
|- - ugordan   QUOTE (volcanopele @ Jul 27 2010, 08:22 A...   Jul 27 2010, 12:53 PM
|- - tedstryk   QUOTE It is indeed more correct. The images look m...   Jul 27 2010, 02:18 PM
|- - ugordan   QUOTE On any computer monitor, the dynamic range i...   Jul 27 2010, 05:33 PM
|- - tedstryk   I'm not confusing anything. Not only is the m...   Jul 27 2010, 06:56 PM
|- - ugordan   QUOTE (tedstryk @ Jul 27 2010, 08:56 PM) ...   Jul 28 2010, 05:51 PM
- - eoincampbell   Really brilliant work here, much appreciated...   Jul 27 2010, 06:04 AM
- - JohnVV   color ???? "that is the question " when ...   Jul 27 2010, 07:10 AM
|- - DrShank   QUOTE (JohnVV @ Jul 27 2010, 02:10 AM) co...   Jul 28 2010, 04:24 PM
- - volcanopele   Wow, yeah, that is WAYYYY too red and dark. Bjorn...   Jul 27 2010, 07:17 AM
- - 4th rock from the sun   My non technical argument would be that we use mon...   Jul 28 2010, 01:44 PM
- - volcanopele   My biggest issue at this point seems to be that th...   Jul 28 2010, 06:03 PM
|- - ugordan   QUOTE (volcanopele @ Jul 28 2010, 08:03 P...   Jul 28 2010, 06:10 PM
- - volcanopele   hmm, that doesn't seem to work, but then again...   Jul 28 2010, 06:27 PM
|- - ugordan   Hmm. I'm stuck with a laptop right now with lo...   Jul 28 2010, 06:38 PM
- - JohnVV   oops i posted the wrong link -- i am going to hav...   Jul 28 2010, 07:59 PM
- - 4th rock from the sun   Regarding image color profiles and the Web: My per...   Jul 28 2010, 08:48 PM
- - JohnVV   well there is AdobeRGB1998.icc HP5000_UVDuraImage...   Jul 28 2010, 09:09 PM
|- - ugordan   Perhaps this digression should be extracted into a...   Jul 28 2010, 09:22 PM
|- - ugordan   An 8-footprint, roughly natural color Galileo mosa...   Aug 30 2010, 06:51 PM
|- - tedstryk   Nice. I have a blog entry about that data set tha...   Aug 31 2010, 04:24 PM
- - machi   Little animation experiment with two Jupiter's...   Apr 1 2011, 07:21 PM
- - Bjorn Jonsson   Wow... When doing these morphed animations, are y...   Apr 2 2011, 02:46 PM
- - machi   Normally I'm using Sqirlz Morph, because of bi...   Apr 2 2011, 03:39 PM
- - machi   Cross-eye 3D view of 11 km high Tohil Montes and R...   Jul 30 2011, 04:24 PM
- - elakdawalla   that is very cool, Machi!!   Jul 30 2011, 06:28 PM
- - algorimancer   That's gotta be the most dramatic view of Euro...   Jul 30 2011, 08:39 PM
|- - volcanopele   QUOTE (algorimancer @ Jul 30 2011, 01:39 ...   Jul 30 2011, 09:43 PM
|- - tedstryk   Yeah, you won't find topography like that on E...   Jul 30 2011, 10:25 PM
|- - algorimancer   QUOTE (tedstryk @ Jul 30 2011, 04:25 PM) ...   Jul 31 2011, 01:54 AM
- - Phil Stooke   Unless it's Europa in Philovision. Phil   Jul 31 2011, 01:02 AM
- - machi   It's my fault, I forgot "Ionian" bef...   Jul 31 2011, 10:43 AM
- - machi   Now, more stereoscopic images (BW and color anagly...   Aug 2 2011, 05:53 PM


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